_acme-challenge.a.9zy.top DNS Lookup

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DNS Test Findings for _acme-challenge.a.9zy.top

Tested
Sep 30, 2026, 9:37 PM
Completed probes
306/306
DNS response probes
2 (0.7%)
Average DNS lookup time
418 ms

This DNS lookup on 2026-09-30 13:37 observed an overall DNS response rate of 0.7, with only 2 of 306 nodes returning a valid result and a median DNS lookup time of 418 ms. Mobile and overseas nodes returned no resolver response in this wind

_acme-challenge.a.9zy.top 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 (%)

1.4%Highest rate
DNS response rateDNS 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.050100Telecom: 0.8%0.8%TelecomUnicom: 1.4%1.4%UnicomMobile: 0%0%MobileOverseas: 0%0%Overseas

P50 DNS lookup time

DNS lookup time (ms)

197 msLowest P50
P50 DNS lookup timeDNS 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.0375750Telecom: 197 ms197 msTelecomUnicom: 639 ms639 msUnicomMobile: ----MobileOverseas: ----Overseas
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.

Key findings

  • Overall DNS response rate was 0.7; only 2 of 306 nodes returned a valid result, leaving 304 unanswered lookups.
  • Overall DNS lookup time was 418 ms at the median, 595 ms at P90 and 617 ms at P95, all above the 200 ms threshold.
  • Telecom nodes showed a 0.8 response rate at 197 ms, while unicom nodes showed 1.4 at 639 ms, a 442 ms gap.
  • Mobile and overseas nodes both showed a 0 response rate with no observed resolver response; only 1 resolved address appeared across all answers.

Improvement recommendations

  • The DNS response rate is 0.7%, below the 99% review threshold. Retest the unanswered probes and verify the authoritative DNS service, query type, and record only if failures persist.
  • P50 reached 418 ms, above the 200 ms review threshold. Repeat the same probes at a different time and investigate the relevant resolver service and query path only if the elevated median persists.
  • China Unicom has a P50 latency gap of 442 ms versus China Telecom. Compare routes from both groups and verify that the gap narrows after any routing change.

These results describe this distributed test only and do not establish long-term availability, security, or a root cause.