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op-online.de

Checked 2026-10-21 23:41 UTC · first added 2026-10-21
✗Problems found Score 45 of 100

Domain & DNS

fail

18 passed 2 warn 3 failed

Areas

iRegistration iDelegation ✗Nameservers ✓SOA !DNSSEC ✗Records

Problems

  • ✗
    Lame delegation
    Nameservers · These nameservers don't answer authoritatively for the zone, so resolvers ignore them: dns.dns1.de (95.130.16.246): NOERROR, authoritative=true.
    #15
  • ✗
    Open recursion
    Nameservers · These nameservers resolve names for anyone, which makes them usable for DNS amplification attacks and cache poisoning: dns.dns1.de (95.130.16.246). Disable recursion on authoritative servers.
    #16
  • ✗
    CNAME at the apex
    Records · The zone apex is a CNAME to ohlnglnglfcbieNn1.op-online.de. A CNAME can't coexist with the SOA and NS records (RFC 1034); use your provider's ALIAS/flattening feature instead.
    #33
  • !
    No EDNS
    Nameservers · These nameservers don't support EDNS(0), needed for DNSSEC and answers larger than 512 bytes: dns.dns1.de (95.130.16.246).
    #20
  • !
    Not signed
    DNSSEC · The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27

Recent checks

✗

Full report

Domain & DNS report for op-online.de ›

Mail

fail

23 passed 3 warn 1 failed

Areas

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

Problems

  • ✗
    Policy: none (monitoring only)
    DMARC · DMARC policy is set to 'none', which only monitors but doesn't protect against spoofing. Consider upgrading to 'quarantine' or ideally 'reject'.
    #4
  • !
    Not enabled
    DNSSEC · DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.
    #8
  • !
    Single MX host, no backup
    MX · Only one MX record found. For better email reliability, consider adding at least one backup MX server.
    #12
  • !
    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 op-online.de ›