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internet.nl

Checked 2026-10-21 21:22 UTC · first added 2026-10-21

!Check could not complete

Domain & DNS

error

26 passed 2 warn 0 failed 1 errors

lookups failed for rdap; results are incomplete

Areas

iRegistration iDelegation !Nameservers !SOA iDNSSEC iRecords

Problems

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Software version disclosed

Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns1.sidnlabs.nl: "9.20.30"; ns2.sidnlabs.nl: "Knot DNS 3.6.1"; ns2.sidnlabs.nl: "Knot DNS 3.6.2". Hide or replace the version string.

#17
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Serials differ

SOA · The nameservers serve different versions of the zone: 10315 on ns2.sidnlabs.nl (194.0.28.11), ns2.sidnlabs.nl (2001:678:2c:0:194:0:28:11); 10321 on ns1.sidn.nl (192.174.68.144), ns1.sidn.nl (2001:67c:1bc::144), ns1.sidnlabs.nl (94.198.159.8), ns1.sidnlabs.nl (2a00:d78:0:712:94:198:159:8), ns2.sidn.nl (176.97.158.144), ns2.sidn.nl (2001:67c:10b8::144). This is normal for a few minutes after a change; if it lasts, zone transfers to the secondaries are failing.

#22

Recent checks

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Full report

Domain & DNS report for internet.nl ›

Mail

warn

27 passed 3 warn 0 failed

Areas

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

Problems

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No key under common selectors

DKIM · The _domainkey name exists but no DKIM key was found under the common selectors. Selectors are provider-specific; check yours with -selector.

#7
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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
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Not configured

TLS · MTA-STS or DANE is used without TLS-RPT, so you get no reports when senders fail to deliver because of TLS problems. Publish _smtp._tls TXT "v=TLSRPTv1; rua=mailto:...".

#35

Recent checks

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Full report

Mail report for internet.nl ›