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hetnieuweinstituut.nl

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

Domain & DNS

error

22 passed 3 warn 0 failed 1 errors

lookups failed for rdap; results are incomplete

Areas

iRegistration !Delegation iNameservers !SOA iDNSSEC !Records

Problems

  • !
    No IPv6
    Delegation · None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13
  • !
    Unusual SOA timers
    SOA · expire 1h is shorter than 7d; secondaries stop answering too soon when the primary is down; expire 1h must be longer than refresh + retry; negative caching TTL (minimum) 7d is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 3h, retry 1h, expire 1h, negative TTL 7d.
    #23
  • !
    Very low TTLs
    Records · These records have a TTL below 5m, causing extra queries and slower lookups: A (30s). Low TTLs are useful just before a planned change.
    #32

Recent checks

!

Full report

Domain & DNS report for hetnieuweinstituut.nl ›

Mail

fail

20 passed 3 warn 1 failed

Areas

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

Problems

  • ✗
    No DMARC record
    DMARC · No DMARC record was found for this domain. DMARC is essential for preventing email spoofing. Add a DMARC record with p=reject or at least p=quarantine.
    #5
  • !
    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). 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

✗

Full report

Mail report for hetnieuweinstituut.nl ›