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online.nl

Checked 2026-10-21 21:24 UTC · first added 2026-10-21
✗Problems found Score 53 of 100

Domain & DNS

fail

18 passed 4 warn 1 failed

Areas

iRegistration ✗Delegation iNameservers !SOA !DNSSEC iRecords

Problems

  • ✗
    Nameserver names don't resolve
    Delegation · These nameservers have no A or AAAA record, so they can't be reached (lame delegation): ns.euronet.com.
    #9
  • !
    NS sets differ
    Delegation · The nameservers at the parent and in the zone should be the same. Only at the parent: ns.euronet.com; only in the zone: ns.euro.net. ns.as5390.net, ns.euro.net report NS ns.as5390.net ns.euro.net.
    #7
  • !
    Nameservers in one network
    Delegation · all IPv4 addresses are in 83.119.20.0/24. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).
    #10
  • !
    Unusual SOA timers
    SOA · retry 30m should be shorter than refresh 30m. Current values: refresh 30m, retry 30m, expire 21d, negative TTL 1h.
    #23
  • !
    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 online.nl ›

Mail

fail

23 passed 5 warn 1 failed

Areas

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

Problems

  • ✗
    12 DNS lookups, over the limit of 10
    SPF · SPF record needs 12 DNS lookups (including nested includes), more than the limit of 10. Receivers will return a permerror; reduce includes or flatten the record.
    #2
  • !
    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
  • !
    Not enabled
    DNSSEC · DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.
    #8
  • !
    Hosts without IPv6
    MX · The following MX hosts could not be resolved to IPv6 addresses: mx.capitar.com, smtp-in.online.nl
    #11
  • !
    Hosts are CNAMEs
    MX · MX records must point to a host name with A/AAAA records, not to a CNAME: smtp-in.online.nl -> smtp-in.mail.online.nl
    #22
  • !
    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 online.nl ›