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vu.nl

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

Domain & DNS

error

24 passed 3 warn 0 failed 1 errors

lookups failed for rdap; results are incomplete

Areas

iRegistration !Delegation iNameservers ✓SOA !DNSSEC ✓Records

Problems

  • !
    Nameservers in one network
    Delegation · all IPv4 addresses are in 130.37.164.0/24. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).
    #10
  • !
    No IPv6
    Delegation · None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13
  • !
    NSEC3 with extra iterations or salt
    DNSSEC · NSEC3 uses 10 iterations and a 2-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

!

Full report

Domain & DNS report for vu.nl ›

Mail

fail

27 passed 4 warn 1 failed

Areas

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

Problems

  • ✗
    Policy not reachable
    TLS · The MTA-STS record exists but the policy could not be fetched, so senders ignore MTA-STS: Get "https://mta-sts.vu.nl/.well-known/mta-sts.txt": tls: failed to verify certificate: x509: certificate is valid for 14-3-3.eu, www.14-3-3.eu, not mta-sts.vu.nl.
    #33
  • !
    Policy: quarantine
    DMARC · DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.
    #4
  • !
    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 74h0m0s
    DNSSEC · DNSKEY signatures expire at 2026-10-24T23:52:43Z (in 74h0m0s). Check that re-signing works.
    #21
  • !
    1024-bit DKIM key
    DKIM · 1024-bit RSA keys are the minimum and are considered weak today: k1 (1024 bits), selector1 (1024 bits). Rotate to a 2048-bit key.
    #23

Recent checks

✗

Full report

Mail report for vu.nl ›