SurfaceMap › s › slo.nl

slo.nl

Checked 2026-10-21 21:25 UTC · first added 2026-10-21
!Check could not complete

Domain & DNS

error

26 passed 2 warn 0 failed 1 errors

lookups failed for rdap; results are incomplete

Areas

iRegistration !Delegation iNameservers !SOA iDNSSEC iRecords

Problems

  • !
    NS sets differ
    Delegation · The nameservers at the parent and in the zone should be the same. Only at the parent: ns2.dn-s.be, ns3.dn-s.eu, ns4.dn-s.org; only in the zone: ns2.dn-s.nl, ns3.dn-s.nl, ns4.dn-s.nl. ns1.dn-s.nl, ns2.dn-s.be, ns2.dn-s.nl, ns3.dn-s.eu, ns3.dn-s.nl, ns4.dn-s.nl, ns4.dn-s.org report NS ns1.dn-s.nl ns2.dn-s.nl ns3.dn-s.nl ns4.dn-s.nl.
    #7
  • !
    Unusual SOA timers
    SOA · refresh 10m is outside 20m–1d; retry 1h should be shorter than refresh 10m. Current values: refresh 10m, retry 1h, expire 14d, negative TTL 1d.
    #23

Recent checks

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Full report

Domain & DNS report for slo.nl ›

Mail

warn

26 passed 4 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
  • !
    Single MX host, no backup
    MX · Only one MX record found. For better email reliability, consider adding at least one backup MX server.
    #12
  • !
    1024-bit DKIM key
    DKIM · 1024-bit RSA keys are the minimum and are considered weak today: k1 (1024 bits), selector2 (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 slo.nl ›