SurfaceMap › o › ou.nl

ou.nl

Checked 2026-10-21 21:24 UTC · first added 2026-10-21
✗Problems found Score 69 of 100

Domain & DNS

fail

23 passed 2 warn 1 failed

Areas

iRegistration !Delegation ✗Nameservers ✓SOA iDNSSEC !Records

Problems

  • ✗
    Nameservers not responding
    Nameservers · These addresses did not answer, so resolvers waste time on timeouts: dns.ou.nl (2001:610:338:1030::126:14): read udp [2a01:4f8:1c1c:eebf::1]:42069->[2001:610:338:1030::126:14]:53: i/o timeout; ns.ou.nl (2001:610:338:1030::126:12): read udp [2a01:4f8:1c1c:eebf::1]:36975->[2001:610:338:1030::126:12]:53: i/o timeout; ns2.ou.nl (2001:610:338:1030::126:13): read udp [2a01:4f8:1c1c:eebf::1]:53838->[2001:610:338:1030::126:13]:53: i/o timeout.
    #14
  • !
    Nameservers in one network
    Delegation · all IPv4 addresses are in 145.20.126.0/24; all IPv6 addresses are in 2001:610:338::/48. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).
    #10
  • !
    Very low TTLs
    Records · These records have a TTL below 5m, causing extra queries and slower lookups: A (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1h and in the zone 2d; resolvers may use either.
    #32

Recent checks

✗

Full report

Domain & DNS report for ou.nl ›

Mail

warn

25 passed 5 warn 0 failed

Areas

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

Problems

  • !
    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
  • !
    Signatures expire in 79h0m0s
    DNSSEC · DNSKEY signatures expire at 2026-10-25T04:21:23Z (in 79h0m0s). Check that re-signing works.
    #21
  • !
    Hosts are CNAMEs
    MX · MX records must point to a host name with A/AAAA records, not to a CNAME: relay.ou.nl -> lnx-hrl-042v.ou.nl
    #22
  • !
    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

!

Full report

Mail report for ou.nl ›