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hotelschool.nl

Checked 2026-10-22 13:51 UTC · first added 2026-10-21
!Check could not complete

Domain & DNS

error

27 passed 2 warn 1 failed 1 errors

lookups failed for rdap; results are incomplete

Areas

iRegistration iDelegation ✗Nameservers ✓SOA !DNSSEC ✓Records

Problems

  • ✗
    Zone transfer allowed
    Nameservers · These nameservers send the complete zone to anyone who asks (AXFR), exposing all host names: ns1.hdh.nl (52.136.200.63): 596 records. Restrict zone transfers to your secondary servers.
    #18
  • !
    Software version disclosed
    Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns1.hdh.nl: "9.11.5-P4-5.1+deb10u11-Debian". Hide or replace the version string.
    #17
  • !
    NSEC3 with extra iterations or salt
    DNSSEC · NSEC3 uses 10 iterations and a 0-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 hotelschool.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
  • !
    Applies to 5% of mail
    DMARC · DMARC policy only applies to 5% of failing mail (pct=5). Raise pct to 100 once you are confident in your setup.
    #18
  • !
    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 hotelschool.nl ›