exam.kernelsu.org DNS Lookup

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    DNS Test Findings for exam.kernelsu.org

    Tested
    Oct 19, 2026, 10:23 PM
    Completed probes
    305/305
    DNS response probes
    0 (0%)
    Average DNS lookup time
    --

    This DNS lookup test for exam.kernelsu.org ran on 2026-10-19. None of the 305 nodes obtained a valid DNS response, giving a 0% DNS response rate with no DNS lookup time or observed resolved address recorded.

    exam.kernelsu.org 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
    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%0%TelecomUnicom: 0%0%UnicomMobile: 0%0%MobileOverseas: 0%0%Overseas

    P50 DNS lookup time

    DNS lookup time (ms)

    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.050100Telecom: ----TelecomUnicom: ----UnicomMobile: ----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

    • All 305 nodes returned no valid DNS response; respondedNodeCount is 0, so every lookup was unanswered.
    • DNS response rate was 0% on telecom, unicom, mobile and overseas carriers, with 122, 74, 77 and 32 nodes respectively.
    • Because no node responded, DNS lookup time percentiles could not be computed and the unique response IP count is 0.

    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.