How Good Is 1DUN? An In-Depth Review of SCDN, High-Defense IP, Anycast CDN, and Game Shield

If you've been looking into high-defense CDNs, DDoS protection, or game shields lately, you may have come across 1DUN.

Its official site is 1dun.com. On first visit, it's easy to mistake it for just another high-defense CDN vendor. But once you go through the full product lineup, you'll find it stopped being "just a CDN" a long time ago. It now offers SCDN, an SDK game shield, high-defense IP, Anycast CDN, and Edge AI, plus separate industry solutions for iGaming, cross-border business, promotional landing pages, social apps, live streaming, AI, Web3, and financial trading.

So to put it more accurately, 1DUN is an enterprise-grade security and acceleration platform that combines CDN, DDoS protection, WAF, Bot management, Anycast networking, high-defense IP, and client-side SDKs into one package.

So how good is it really? How does SCDN differ from a regular CDN? How should you interpret 15Tbps+ protection? Who is the game shield for? And how do you choose between high-defense IP and SCDN?

Below, I won't just repeat the official copy. I'll try to break it down from the perspective of a third-party site owner and network product user.

What kind of platform is it, really

First, a rough definition for anyone encountering it for the first time.

1DUN is a service platform built around enterprise-grade CDN, DDoS protection, and global network acceleration. Its main products currently include SCDN, high-defense IP, Anycast CDN, SDK game shield, and Edge AI.

The official "About Us" page says it was founded in 2020, starting with a global CDN network and gradually adding security, edge computing, and AI scheduling. The site also claims 3,000+ global nodes and T-level DDoS defense.

But node count isn't my first metric for judging it. What's really worth looking at is what exactly it has integrated together.

Traditional CDNs mainly handle content delivery. 1DUN's product logic is more like: access acceleration + attack scrubbing + web security + Bot management + origin hiding + network scheduling. That's also the point of the SCDN concept.

SCDN is the core

Judging from the product layout on the official site, SCDN is one of 1DUN's most core products right now.

SCDN can be simply understood as Security CDN, i.e., a security-focused CDN.

A regular CDN's logic is roughly: user → CDN node → cache → origin.

SCDN is closer to: user → edge node → DDoS scrubbing → WAF → CC/Bot identification → cache and acceleration → origin.

In other words, security inspection itself happens at the CDN edge.

The features currently listed on 1DUN's SCDN page include DDoS protection, WAF, CC defense, Bot management, TLS 1.3, origin hiding, automatic failover, Anycast, HTTP/3, QUIC, and WebSocket. The site also claims SCDN uses 3,000+ global nodes and 15Tbps+ scrubbing capacity.

From an architecture standpoint, this is no longer a static-asset CDN in the ordinary sense.

The difference between SCDN and a regular CDN

This is actually worth discussing.

If a site is just a corporate homepage with a few hundred users a day and no attacks, a regular CDN is more than enough.

But for sites that regularly face DDoS, CC, scanning, crawlers, API attacks, Bots, and malicious requests, caching images, JS, and CSS alone won't solve the problem.

The biggest difference with SCDN is that security capabilities become part of the CDN. 1DUN's SCDN page explicitly lists the chain of DDoS + WAF + Bot + origin hiding.

In theory, this architecture has an obvious benefit: malicious requests are blocked at the edge as much as possible, rather than continuing to hit the origin. Because what really brings a site down is often not too many visitors, but a flood of invalid requests consuming origin resources.

How to interpret 15Tbps+

This is one of the figures 1DUN's official site emphasizes most.

Multiple pages publicly display 15Tbps+ global scrubbing capacity. The SCDN page says different plans provide DDoS baseline capabilities ranging from 80Gbps, 240Gbps, 500Gbps, up to 1Tbps.

Here we must distinguish one concept: a platform's total scrubbing capacity and a single customer's plan protection capacity are completely different things.

A platform having 15Tbps of total protection capacity doesn't mean you can use 15Tbps on your own with the lowest-tier plan. From 1DUN's public plans you can see this too: the lightweight version has an 80Gbps DDoS baseline, the business version 240Gbps, the enterprise version 500Gbps, and the flagship version 1Tbps.

So what users should really pay attention to is: how much actual protection their own plan gets. Not just the maximum capacity of the entire network.

As for the 15Tbps figure, I won't directly write "1DUN can actually withstand 15Tbps attacks in testing." That hasn't been verified by independent attack testing. The accurate statement should be: 1DUN's official site currently claims global scrubbing capacity reaching 15Tbps+. That's a different thing from "we ourselves tested a 15Tbps attack." A normal third-party review organization wouldn't actually launch a 15Tbps DDoS just to write an article—it's neither realistic nor legal.

For ordinary users actually testing high-defense services, what matters more is whether the site can still be accessed normally after a small-scale real attack occurs.

Real high-defense isn't just about absorbing traffic

Many high-defense products love to advertise 300G, 500G, 1T, 10T.

But another issue truly affects site experience: after scrubbing, can normal users still access it?

Once an attack comes, if the system policy is CAPTCHAs for all users, blocking all APIs, and banning all overseas IPs, then the attack may indeed not get through—but the business is gone too.

So when evaluating a high-defense CDN like 1DUN, I pay more attention to the false-positive rate for normal users, whether Googlebot works normally, whether APIs work normally, whether login requests are misjudged, whether WebSocket is stable, latency changes during attacks, and whether origin CPU and traffic drop.

These metrics are often more practical than "claims to withstand X T."

CC protection is a different matter

Compared with traditional DDoS, CC is actually more troublesome.

DDoS is like a flood, with massive traffic directly saturating bandwidth or connection counts. CC is more like a large number of requests that "look like normal users," constantly hitting /login, /search, /api, /product, /register. Each request may carry very little data, but it triggers PHP, Java, Node.js, databases, Redis, and APIs, so server CPU shoots straight to 100%.

So the core of CC protection isn't how much bandwidth you have, but whether you can identify abnormal behavior.

In 1DUN's current SCDN plans, CC defense capability is explicitly listed separately, and the publicly available tiers show specs like 20,000 QPS, 40,000 QPS, 60,000 QPS, and 200,000 QPS. This at least shows 1DUN hasn't simply lumped DDoS protection and CC protection into one concept. That's fairly important among high-defense products.

WAF and Bot management

1DUN has WAF, i.e., a Web Application Firewall.

What it mainly targets isn't large-traffic attacks, but the HTTP requests themselves—things like SQL injection, XSS, malicious scanning, abnormal requests, some vulnerability exploits, and Bot behavior.

In 1DUN's currently public SCDN product structure, WAF is part of the default security system, and starting from the business version, professional WAF is explicitly listed. This also shows 1DUN's positioning really isn't just selling bandwidth, but providing two layers of protection: network layer + application layer.

Bot protection is also becoming increasingly important. In the past, the most common attack defense was blocking IPs, but that's getting harder and harder. Attack traffic can come from cloud servers, residential proxies, mobile networks, dynamic proxy pools, and large numbers of real devices. An IP attacks for a few seconds and switches immediately, so IP blacklists alone are hard to solve it.

So more mature security platforms today are starting to do behavior recognition. 1DUN's currently public Bot management mechanisms include behavior analysis, JS Challenge, fingerprint verification, and human-machine scoring. The core idea isn't "is this IP a bad guy," but "does this access behavior look like a real person." For e-commerce, login, registration, APIs, flash sales, and content sites, this capability will become increasingly important.

Origin hiding—don't assume connecting to a CDN is enough

This is the mistake many site owners make most easily when connecting to a high-defense CDN.

You point www.example.com to 1DUN, and attack traffic does go through the CDN. But if the attacker already knows your origin IP, they can completely bypass the CDN and hit the origin directly.

So a complete high-defense system must achieve origin hiding. 1DUN's current SCDN and high-defense IP products both explicitly list origin IP hiding as a core capability.

But a vendor hiding the origin behind the CDN doesn't mean old IP records automatically disappear. After connecting, you should also check historical DNS, subdomains, MX records, mail servers, API domains, old test domains, GitHub configurations, and open server ports. Otherwise the origin can still be found.

High-defense IP is for non-HTTP business

Besides SCDN, 1DUN has another standalone product: high-defense IP.

Its biggest difference from SCDN is that SCDN mainly targets domains and web business, while high-defense IP can directly provide a high-defense entry IP for your business and then forward ports via TCP / UDP.

1DUN's currently public high-defense IP page states: it provides dedicated high-defense IPs, supports all TCP/UDP ports, hides the origin, and can be used for websites, games, apps, and private protocols.

This means it's not only suitable for websites, but also for non-HTTP business.

Based on the prices currently public on the official site as of September 2026, Basic is $149/month, 1 high-defense IP, 200Gbps protection, 10 forwarding rules. Professional is $599/month, 1 high-defense IP, 500Gbps protection, 30 forwarding rules, with CC defense. Enterprise is $1,499/month, 2 high-defense IPs, 1Tbps protection, 50 forwarding rules. There's also 10Tbps+ custom-grade protection.

You can see that 1DUN's high-defense IP isn't positioned for the small site-owner market at a few dozen bucks a month; it clearly leans more toward commercial and enterprise business.

When should you choose high-defense IP instead of SCDN? It's actually easy to judge. If your business is a website, HTTP / HTTPS, then SCDN is usually more direct. But if your business is a game, TCP service, UDP service, custom protocol, a fixed-port service, or a service without a domain, then high-defense IP is more suitable. Because it doesn't require your business to be HTTP-based.

The game shield may be its more distinctive product

Another key product from 1DUN right now is the SDK game shield.

It's not a traditional CDN, nor a simple high-defense server, but an SDK integrated directly into the game client. The official site currently says it supports iOS, Android, and Flutter. After integration, it provides anti-attack, anti-pollution, and anti-blocking capabilities for game connections through the shield node network.

This product is fairly interesting, because game business is completely different from websites.

Regular website users access HTTPS, and the CDN handles HTTP requests. But games may use TCP long connections, UDP, custom protocols, and real-time communication. What players fear most isn't a page opening 0.5 seconds late, but disconnection. Especially during combat, trading, or competition, any few seconds of disconnection is a terrible experience.

So what game networking really cares about is packet loss, latency, jitter, node switching, DDoS, DNS pollution, and IP blocking. That's also why game shields have become a standalone industry product.

1DUN's game shield also emphasizes not relying on public DNS, using private addressing + multi-entry probing. Why does that matter? Because if a regular website's domain DNS has issues, it may just mean the site won't open. But if a game's entire connection entry depends on a fixed domain, then DNS pollution, domain hijacking, or node blocking could leave an entire batch of players unable to connect to the server. The SDK model can put node selection into client-side logic, allowing more backup entries. This is also one of the biggest differences between a game shield and an ordinary CNAME CDN.

The official site currently uses three main selling points on the SDK game shield page: anti-attack, anti-pollution, and anti-blocking, and mentions mechanisms like dynamic shield IP pools, encrypted links, and automatic rerouting. As a third-party review, this needs to be viewed objectively. Any network system's so-called "anti-blocking" isn't an absolute concept; the real effect depends on the user's region, carrier, actual network policies, node scale, IP resources, and switching speed. If your business relies heavily on this, it's advisable to run long-term real client testing directly rather than just reading the official description.

Anycast CDN is for global business

1DUN also has Anycast CDN.

The core idea of Anycast is simple: multiple regions announce the same IP. After a user connects to this IP, the network routes traffic to a relatively suitable access point. For example, US users, European users, and Japanese users all access the same IP, but in practice they don't necessarily enter the same data center.

The most direct advantage is simple access. For large global businesses, you don't need one IP per region; you can have a unified entry and then schedule through a global BGP network. At the same time, if a particular node has issues, traffic can be rerouted to other nodes.

So Anycast is well suited for global websites, APIs, SaaS, DNS, game entries, and cross-border e-commerce.

There's a detail worth noting about node counts. Different pages on 1DUN's official site don't use entirely consistent counting standards. The top of the Anycast CDN page says 2,700+ global edge nodes, while other areas of the same page say 3,000+ nodes, and the About Us page says 3,200+ global nodes. This doesn't necessarily mean the data is wrong; it could also be different counting standards for product-available nodes, edge nodes, and overall platform resource nodes.

But from a third-party perspective, I won't jump to the conclusion that 1DUN definitely has 3,200 fully independent POPs. A more precise statement is this: 1DUN's official website currently publicly presents a 3,000+ global edge network, and the specific node-count figures vary somewhat across different product pages. If node coverage matters a lot to your business, you should ask the vendor directly for a list of nodes in specific regions. That's more important than the total number.

On pricing, 1DUN's currently published Anycast CDN pricing is Starter at $299/month, 100GB of traffic, basic DDoS protection, SSL, and smart caching. Professional is $499/month, 1TB of traffic, 1Tbps DDoS, WAF, and bot protection. Enterprise is $1,999/month, 10TB of traffic, 5Tbps DDoS, and custom security rules. There are also custom versions with 10Tbps+ protection and private node deployment.

So it's still not an ordinary cheap CDN — it leans enterprise-grade.

HTTP/3, QUIC, and AI concepts

1DUN's SCDN product page clearly lists HTTP/3 + QUIC + TLS 1.3.

Why does HTTP/3 matter? Traditional HTTP/1.1 and HTTP/2 mainly run over TCP, while HTTP/3 uses QUIC, which is based on UDP. In some high-latency, mobile, and cross-border scenarios, HTTP/3 can theoretically reduce some of the connection setup cost.

But again, supporting HTTP/3 doesn't mean a website will definitely get faster. Actual performance still depends on nodes, routes, cache hit rate, user location, and origin pull. The protocol is only one factor.

Like many CDN security vendors today, 1DUN's website also makes heavy use of concepts like AI-powered scheduling and AI threat detection. The main application areas currently listed on the site include node load analysis, network path selection, cache prediction, anomalous behavior analysis, attack identification, and protection policy adjustment.

From a technical standpoint, these scenarios are indeed well suited to machine learning or automated policies. But as a user, there's really no need to get hung up on which model the AI actually uses. What users should ultimately care about is only this: Is the network more stable? Are attacks being blocked? Are legitimate users being falsely flagged? Does it fail over automatically when something goes wrong? If those things aren't done well, it doesn't matter how grand the AI claims are.

Can it be used for China cross-border business?

1DUN currently offers a dedicated China cross-border solution, positioned on its website as ICP-filing-free access + premium CN2 routes, used for scenarios where an overseas origin serves users in China.

In theory, this type of product mainly solves a classic problem: overseas origins are slow to access from mainland China. For example, if the server is in Hong Kong, Japan, Singapore, or the US, Chinese users accessing it over ordinary international routes may run into high latency, packet loss, and peak-hour congestion. So CN2 or other mainland-optimized routes do have real value in themselves.

But just because the website says CN2 doesn't mean China Telecom, China Unicom, and China Mobile all perform the same nationwide. Mainland China's network has to be broken down: Telecom, Unicom, Mobile, and further into East China, South China, North China, and Southwest China. For example, Guangzhou Telecom being fast doesn't mean Sichuan Mobile will be fast too. So if you plan to use 1DUN for China cross-border acceleration, definitely test with multi-carrier nodes.

Don't test just once

If your website is already on 1DUN, you can use an independent third-party website speed test tool, such as Chahu Speed Test (chahu.com), for multi-node checks.

For the same website, run one round before onboarding and another round after. Focus on comparing DNS resolution, TCP connection, HTTPS, time to first byte, HTTP status codes, Telecom, Unicom, Mobile, overseas nodes, and timeout rates. This kind of before-and-after comparison is far more valuable than looking at a single speed test chart.

CDNs are very good at creating misleading screenshots. For example, at 2 a.m. when the network is empty, everything tests green, and then someone says this CDN is the best in the world — that's meaningless. Really, you should test at least in the morning, afternoon, 8 p.m., and 10 p.m., and then see whether there are obvious fluctuations across different carriers. Especially for cross-border routes, peak-hour data is very important.

SEO sites need to watch Googlebot

Any CDN, WAF, or bot protection can affect search engines, especially Googlebot.

For example, if the security system misidentifies Googlebot as a crawler and gives it a 403, a CAPTCHA, or a JS challenge, then Google may not be able to crawl pages properly. So after onboarding 1DUN SCDN, it's a good idea to check Google Search Console, paying particular attention to crawl errors, 5xx, 403, page indexing, robots, and whether HTML is returned in full.

Some people ask: once bot protection is enabled, will it block Google too? With a normal configuration, it shouldn't. A mature bot management system should be able to distinguish legitimate search engines from malicious crawlers. But if you write very aggressive WAF rules yourself, such as blocking all non-browser access, then you could end up hurting search engines. So security rules always need tuning — turning them up as harshly as possible isn't better.

Who it's for, and who it's not for

After looking at the whole product lineup, 1DUN's target customers are actually fairly clear.

Websites that are frequently attacked, such as finance, trading, gaming, Web3, resource sites, and communities — these have a relatively high need for DDoS + CC protection. Gaming businesses, especially real-time connection games, are clearly the target users for 1DUN's SDK Game Shield. Global businesses, if users come from North America, Europe, Southeast Asia, Japan, and Korea, then Anycast CDN makes more sense. China cross-border businesses, with origins overseas and users in mainland China, can focus on testing 1DUN's CN2 cross-border routes. API and SaaS businesses are especially afraid of CC and bots, so the value of WAF, rate limiting, and high-defense protection is more obvious than for an ordinary corporate website.

But if you're just an ordinary personal blog with a few hundred PV a day, a server near your users, and no one attacking you, then 1DUN's enterprise-grade security stack may be overkill. For example, SCDN's current lowest published price is already $480/month. For a personal website, an ordinary CDN or a cloud provider's built-in CDN may be more economical.

Its biggest advantage, and what still needs verification

Looking at the current product lineup, 1DUN's biggest feature isn't the number of nodes — it's that the product chain is fairly complete.

From SCDN to high-defense IP, then Game Shield, and then Anycast CDN, these products happen to cover four different needs: web, Layer 4 networking, game clients, and global acceleration. So a large business can choose separately for different modules.

But a third-party article can't only list the pros. There are a few areas I think still need further verification.

Node count figures. The official website currently has several different statements: 2,700+, 3,000+, and 3,200+. Before purchasing a large plan, it's best to confirm directly which nodes your business will actually use.

Global average latency. 1DUN's website currently publishes metrics such as a global average latency of under 50ms. But a global average has limited meaning for an individual user. A user in Japan doesn't care what the average is for a node in Brazil. You should look at your target market.

Scrubbing capacity. 15Tbps+ is a platform capability, not the default plan capability for every customer. This was already mentioned earlier.

AI metrics. The website shows a lot of AI acceleration, prediction, and interception data. This data is better treated as product documentation. When actually buying, you should still look at your own real results.

Is 1DUN reliable?

This is one of the most common questions when searching for the brand name. But "reliable or not" can't be settled with a single yes or no.

According to currently public information on its website, 1DUN says it was founded in 2020 and has published its global nodes, product plans, company team, office locations, and development record. The website also says it obtained ISO 27001 and PCI DSS certifications in 2022.

But for third-party users to really judge whether a provider is suitable for long-term use, it's still advisable to observe trial results, after-sales response, incident handling, SLA, actual routes, performance when attacks occur, false-positive rate, and long-term stability.

Especially for high-defense products. When there's no attack, everyone looks stable. The real difference often shows up the moment an attack arrives.

A few practical final words

After going through SCDN, high-defense IP, Game Shield, and Anycast CDN, my biggest impression of 1DUN is this: it isn't building products around CDN alone.

It's trying to cover the entire chain — from user access, to attack scrubbing, to application firewall, to network scheduling, and then to origin hiding.

Its core keywords are really: global acceleration, high-defense protection, enterprise-grade security, and gaming networks.

For an ordinary static website, this stack may seem heavy. But for high-attack businesses, gaming, finance, cross-border, API, and Web3, this kind of integrated architecture does have more practical significance.

If you're planning to use 1DUN, it's best to test first. In particular, SCDN currently supports a 3-day free trial, while SDK Game Shield currently publishes a 7-day free trial.

When testing, don't just look at the console saying "attack blocked." You should look more at whether user-side access is normal, whether origin CPU has dropped, whether network packet loss has improved, whether CDN caching is working properly, whether the WAF is producing false positives, whether Googlebot can access the site, and whether the network is stable during peak hours.