ns.nl

Delegation · The nameservers at the parent and in the zone should be the same. Only in the zone: a20-64.akam.net, a24-65.akam.net, a26-66.akam.net. a1-139.akam.net, a11-66.akam.net, a13-67.akam.net, a20-64.akam.net, a24-65.akam.net, a26-66.akam.net report NS a1-139.akam.net a11-66.akam.net a13-67.akam.net a20-64.akam.net a24-65.akam.net a26-66.akam.net.

Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: a1-139.akam.net: "41824.10"; a11-66.akam.net: "41824.7"; a11-66.akam.net: "41824.4"; a13-67.akam.net: "41824.11"; a13-67.akam.net: "41824.6"; a20-64.akam.net: "48878.31"; a20-64.akam.net: "48878.30"; a24-65.akam.net: "48878.29"; a24-65.akam.net: "48878.30"; a26-66.akam.net: "48878.32"; a26-66.akam.net: "48878.33". Hide or replace the version string.

Records · These records have a TTL below 5m, causing extra queries and slower lookups: A (20s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1h and in the zone 1d; resolvers may use either.

MX · Only one MX record found. For better email reliability, consider adding at least one backup MX server.

DNSSEC · DNSKEY signatures expire at 2026-10-24T16:58:34Z (in 68h0m0s). Check that re-signing works.

DKIM · 1024-bit RSA keys are the minimum and are considered weak today: default (1024 bits), selector1 (1024 bits), s2 (1024 bits). Rotate to a 2048-bit key.

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.

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:...".