persee.fr

Delegation · The nameservers at the parent and in the zone should be the same. Only in the zone: dns2.ens-lyon.fr. diogene.univ-lyon2.fr, dns.ens-lyon.fr, dns2.ens-lyon.fr report NS diogene.univ-lyon2.fr dns.ens-lyon.fr dns2.ens-lyon.fr.

Delegation · None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.

Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: diogene.univ-lyon2.fr: "9.16.23-RH"; dns.ens-lyon.fr: "9.18.49-1~deb12u2-Debian"; dns2.ens-lyon.fr: "9.18.49-1~deb12u2-Debian". 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 (3m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1h and in the zone 2h; resolvers may use either.

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

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

MX · The following MX hosts could not be resolved to IPv6 addresses: mx1.relay.renater.fr, mx2.relay.renater.fr

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.