voelkner.de

Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: a1-56.akam.net: "41824.9"; a1-56.akam.net: "41824.11"; a13-66.akam.net: "41824.11"; a13-66.akam.net: "41824.5"; a16-67.akam.net: "48878.31"; a16-67.akam.net: "48878.33"; a24-65.akam.net: "48878.31"; a24-65.akam.net: "48878.32"; a5-66.akam.net: "41824.9"; a5-66.akam.net: "41824.5"; a8-64.akam.net: "48878.31". Hide or replace the version string.

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.

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

DNSSEC · DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.

DKIM · 1024-bit RSA keys are the minimum and are considered weak today: 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.