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concertgebouw.nl

Checked 2026-10-21 21:00 UTC · first added 2026-10-21
!Check could not complete

Domain & DNS

error

28 passed 1 warn 0 failed 1 errors

lookups failed for rdap; results are incomplete

Areas

iRegistration iDelegation iNameservers !SOA ✓DNSSEC ✓Records

Problems

  • !
    Unusual SOA timers
    SOA · refresh 10m is outside 20m–1d; retry 1h should be shorter than refresh 10m. Current values: refresh 10m, retry 1h, expire 14d, negative TTL 1d.
    #23

Recent checks

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Full report

Domain & DNS report for concertgebouw.nl ›

Mail

warn

29 passed 3 warn 0 failed

Areas

iSPF ✓DMARC !DKIM ✓DNSSEC !MX !TLS iBIMI

Problems

  • !
    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: selector1 (1024 bits), selector2 (1024 bits). Rotate to a 2048-bit key.
    #23
  • !
    Policy in testing mode
    TLS · With mode: testing, senders only report TLS problems (via TLS-RPT) and still deliver without TLS. Switch to mode: enforce once reports are clean.
    #33

Recent checks

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Full report

Mail report for concertgebouw.nl ›