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tb.53kf.com

Checked 2026-10-22 10:55 UTC · first added 2026-10-21
!Check could not complete

Domain & DNS

warn

23 passed 4 warn 0 failed

Areas

iRegistration !Delegation ✓Nameservers !SOA ✓DNSSEC !Records

Problems

  • !
    Glue differs from the zone
    Delegation · The addresses at the parent (glue) differ from the addresses in the zone: vip3.alidns.com (glue 121.40.6.163, 140.205.1.5, 170.33.32.210, 170.33.73.26, 170.33.80.10, 2408:4009:500::3, 39.103.26.212, 47.108.36.163, 47.116.84.178, 8.129.152.245, 8.212.93.3, zone 140.205.1.5, 170.33.32.210, 170.33.73.26, 170.33.80.10, 8.212.93.3, 2408:4009:500::3); vip4.alidns.com (glue 121.40.6.164, 140.205.1.6, 170.33.32.211, 170.33.73.27, 170.33.80.11, 2408:4009:500::4, 39.103.26.213, 47.108.36.164, 47.116.84.179, 8.129.152.246, 8.212.93.4, zone 170.33.32.211, 170.33.80.11, 140.205.1.6, 8.212.93.4, 170.33.73.27, 2408:4009:500::4). Update the glue at your registrar.
    #8
  • !
    Serials differ
    SOA · The nameservers serve different versions of the zone: 2018121115 on vip3.alidns.com (8.212.93.3), vip4.alidns.com (8.212.93.4), vip4.alidns.com (170.33.73.27); 2026081716 on vip3.alidns.com (170.33.32.210), vip3.alidns.com (170.33.73.26), vip4.alidns.com (170.33.80.11); 2026081810 on vip3.alidns.com (140.205.1.5), vip4.alidns.com (170.33.32.211), vip4.alidns.com (140.205.1.6); 2026082415 on vip3.alidns.com (2408:4009:500::3), vip4.alidns.com (2408:4009:500::4); 2026082516 on vip3.alidns.com (170.33.80.10). This is normal for a few minutes after a change; if it lasts, zone transfers to the secondaries are failing.
    #22
  • !
    Unusual SOA timers
    SOA · expire 1d is shorter than 7d; secondaries stop answering too soon when the primary is down. Current values: refresh 1h, retry 20m, expire 1d, negative TTL 10m.
    #23
  • !
    Very low TTLs
    Records · These records have a TTL below 5m, causing extra queries and slower lookups: A (1m), MX (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.
    #32

Recent checks

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Full report

Domain & DNS report for tb.53kf.com ›

Mail

error

0 passed 2 warn 2 failed 1 errors

lookups failed for dnssec; results are incomplete

Areas

✗SPF ✗DMARC !DKIM iDNSSEC !MX iBIMI

Problems

  • ✗
    No DMARC record
    DMARC · No DMARC record was found for this domain. DMARC is essential for preventing email spoofing. Add a DMARC record with p=reject or at least p=quarantine.
    #5
  • ✗
    No SPF record
    SPF · No SPF record was found for this domain. SPF is important for preventing email spoofing. Add an SPF record to specify which servers are authorized to send email for your domain.
    #6
  • !
    No key under common selectors
    DKIM · The _domainkey name exists but no DKIM key was found under the common selectors. Selectors are provider-specific; check yours with -selector.
    #7
  • !
    No MX records
    MX · No MX records found. If this domain is used for email, add MX records to specify mail servers. If it never receives mail, publish a null MX ("MX 0 .").
    #9

Recent checks

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Full report

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