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c3d2.de

Checked 2026-10-21 22:04 UTC · first added 2026-10-21
!Passed with warnings Score 88 of 100

Domain & DNS

warn

29 passed 1 warn 0 failed

Areas

iRegistration ✓Delegation !Nameservers ✓SOA iDNSSEC ✓Records

Problems

  • !
    Software version disclosed
    Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns2.zentralwerk.org: "Knot DNS 3.5.8". Hide or replace the version string.
    #17

Recent checks

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Full report

Domain & DNS report for c3d2.de ›

Mail

warn

30 passed 3 warn 0 failed

Areas

✓SPF !DMARC ✓DKIM ✓DNSSEC !MX iTLS 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
  • !
    Hosts without IPv6
    MX · The following MX hosts could not be resolved to IPv6 addresses: mail.flpk.zentralwerk.org
    #11
  • !
    Single MX host, no backup
    MX · Only one MX record found. For better email reliability, consider adding at least one backup MX server.
    #12

Recent checks

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Full report

Mail report for c3d2.de ›