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udacity.com

Checked 2026-10-22 11:14 UTC · first added 2026-10-21
!Passed with warnings Score 79 of 100

Domain & DNS

warn

28 passed 2 warn 0 failed

Areas

iRegistration iDelegation ✓Nameservers ✓SOA !DNSSEC !Records

Problems

  • !
    Signed but not delegated securely
    DNSSEC · The zone is signed but the parent has no DS record, so the signatures are not used. Publish the DS record at your registrar.
    #27
  • !
    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.
    #32

Recent checks

!

Full report

Domain & DNS report for udacity.com ›

Mail

warn

25 passed 5 warn 0 failed

Areas

✓SPF ✓DMARC !DKIM !DNSSEC !MX !TLS iBIMI

Problems

  • !
    Signed, but no DS at parent
    DNSSEC · The zone is signed (DNSKEY present) but the parent has no DS record, so the chain of trust is incomplete. Publish the DS record at your registrar.
    #8
  • !
    Hosts without IPv6
    MX · The following MX hosts could not be resolved to IPv6 addresses: mxa-00593801.gslb.pphosted.com, mxb-00593801.gslb.pphosted.com
    #11
  • !
    Signatures expire in 7h0m0s
    DNSSEC · DNSKEY signatures expire at 2026-10-22T18:00:00Z (in 7h0m0s). Check that re-signing works.
    #21
  • !
    1024-bit DKIM key
    DKIM · 1024-bit RSA keys are the minimum and are considered weak today: s2 (1024 bits). Rotate to a 2048-bit key.
    #23
  • !
    Not configured
    TLS · MTA-STS is not configured, so other mail servers fall back to unencrypted delivery when TLS fails or is stripped by an attacker. Publish a _mta-sts TXT record and a policy at https://mta-sts.<domain>/.well-known/mta-sts.txt.
    #32

Recent checks

!

Full report

Mail report for udacity.com ›