Nationwide Speed Map
- >10s
- 3s-10s
- 1s-3s
- 0.5s-1s
- <=0.5s
11 monitoring points in this test
100%
| Region | Fastest | Slowest | Average |
|---|---|---|---|
| All Nodes | -- | -- | -- |
| China Telecom | -- | -- | -- |
| China Unicom | -- | -- | -- |
| China Mobile | -- | -- | -- |
| East China | -- | -- | -- |
| South China | -- | -- | -- |
| Central China | -- | -- | -- |
| North China | -- | -- | -- |
| Southwest | -- | -- | -- |
| Northwest | -- | -- | -- |
| Northeast | -- | -- | -- |
| HK/MO/TW | -- | -- | -- |
DNS Resolution Stats
0Showing: 11/11
| Node | Target | Type | Resolved Results | Records | Detail | Time | DNS |
|---|---|---|---|---|---|---|---|
| 电信湖北十堰电信Home | flag.ctfshow.com | A | -- | 0 | Timeout | ||
| 电信四川广安电信Home | flag.ctfshow.com | A | -- | 0 | Timeout | ||
| 电信河北电信Home | flag.ctfshow.com | A | -- | 0 | Timeout | ||
| 电信北京电信Home | flag.ctfshow.com | A | -- | 0 | Timeout | ||
| 联通甘肃联通Home | flag.ctfshow.com | A | -- | 0 | Timeout | ||
| 联通上海数据中心Home | flag.ctfshow.com | A | -- | 0 | Timeout | ||
| 海外俄罗斯莫斯科Home | flag.ctfshow.com | A | -- | 0 | Timeout | ||
| 海外柬埔寨金边Home | flag.ctfshow.com | A | -- | 0 | Timeout | ||
| 海外迪拜Home | flag.ctfshow.com | A | -- | 0 | Timeout | ||
| 电信电信青海Home | flag.ctfshow.com | A | -- | 0 | Timeout | ||
| 电信宿迁电信Home | flag.ctfshow.com | A | -- | 0 | Timeout |
DNS Test Findings for flag.ctfshow.com
- Tested
- Oct 18, 2026, 2:19 PM
- Completed probes
- 11/11
- DNS response probes
- 0 (0%)
- Average DNS lookup time
- --
This DNS lookup for flag.ctfshow.com ran on 2026-10-09. Only 2 of 302 nodes obtained a valid DNS response, giving a 0.7% DNS response rate and a median DNS lookup time of 368 ms. This is a time-bound observation; no node errors were recorde
flag.ctfshow.com DNS lookup performance by network
DNS response rate counts probes with a DNS response and measured lookup time. P50 is the time at or below which half of responding lookups completed; a response need not contain an address and does not establish propagation or poisoning.
DNS response rate
DNS response rate (%)
0%Highest rate
P50 DNS lookup time
DNS lookup time (ms)
Key findings
- Only 2 of 302 nodes returned a valid DNS response, a 0.7% DNS response rate, leaving 300 nodes as unanswered lookups.
- Among 122 telecom nodes, 2 responded (1.6% response rate), with a median DNS lookup time of 368 ms and P90 of 462 ms.
- All 180 nodes across unicom, mobile, and overseas groups produced no valid DNS response, so carrier differences cannot be compared from these figures.
- Six distinct observed resolved addresses were seen, which describes answer diversity only and does not establish resolution correctness or a root cause.
Improvement recommendations
- The DNS response rate is 0%, below the 99% review threshold. Retest the unanswered probes and verify the authoritative DNS service, query type, and record only if failures persist.
These results describe this distributed test only and do not establish long-term availability, security, or a root cause.