SurfaceMap › t › tue.nl

tue.nl

Checked 2026-10-21 21:26 UTC · first added 2026-10-21
!Check could not complete

Domain & DNS

warn

24 passed 2 warn 0 failed

Areas

iRegistration !Delegation iNameservers iSOA !DNSSEC iRecords

Problems

  • !
    NS sets differ
    Delegation · The nameservers at the parent and in the zone should be the same. Only at the parent: ns3.tue.nl. ns01.tue.nl, ns02.tue.nl, ns3.tue.nl report NS ns01.tue.nl ns02.tue.nl.
    #7
  • !
    NSEC3 with extra iterations or salt
    DNSSEC · NSEC3 uses 10 iterations and a 11-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.
    #31

Recent checks

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Full report

Domain & DNS report for tue.nl ›

Mail

error

26 passed 4 warn 0 failed 1 errors

lookups failed for tls-rpt; results are incomplete

Areas

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

Problems

  • !
    Single MX host, no backup
    MX · Only one MX record found. For better email reliability, consider adding at least one backup MX server.
    #12
  • !
    Signatures expire in 81h0m0s
    DNSSEC · DNSKEY signatures expire at 2026-10-25T06:48:33Z (in 81h0m0s). Check that re-signing works.
    #21
  • !
    1024-bit DKIM key
    DKIM · 1024-bit RSA keys are the minimum and are considered weak today: selector1 (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

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Full report

Mail report for tue.nl ›