ihes.fr

dns1.dns.u-psud.fr, dns2.dns.u-psud.fr, seven.ihes.fr

Found

Parent zone

fr

Delegation from

d.nic.fr (194.0.9.1)

NS at the parent

dns1.dns.u-psud.fr, dns2.dns.u-psud.fr, seven.ihes.fr

NS in the zone

dns1.dns.u-psud.fr, dns2.dns.u-psud.fr, nspub.ihes.fr

Checks

• ✓ 3 nameservers #6

  Delegated to dns1.dns.u-psud.fr, dns2.dns.u-psud.fr, seven.ihes.fr.
• !

  NS sets differ

  The nameservers at the parent and in the zone should be the same. Only at the parent: seven.ihes.fr; only in the zone: nspub.ihes.fr. dns1.dns.u-psud.fr, dns2.dns.u-psud.fr, nspub.ihes.fr, seven.ihes.fr report NS dns1.dns.u-psud.fr dns2.dns.u-psud.fr nspub.ihes.fr.

  #7
• ✓ Glue present and correct #8

  Glue is published for the nameservers inside the zone: seven.ihes.fr.
• ✓ All names resolve #9

  Every nameserver name has an address and is not an alias.
• ✓ Nameservers in different networks #10

  The nameservers are spread over 3 IPv4 /24s and 0 IPv6 /48s.
• ✓ 2 autonomous systems #11

  The nameservers are spread over: AS2200 (FR-RENATER - Renater, FR): 2 addresses; AS2269 (FR-U-PARISSUD-ORSAY - Renater, EU): 2 addresses.
• i

  All nameserver names under .fr

  All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.

  #12
• !

  No IPv6

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

  #13

4 of 4 addresses answer authoritatively

Found

Checks

• ✓ All respond #14

  All 4 nameserver addresses answered.
• ✓ All authoritative #15

  Every responding nameserver answers authoritatively for the zone.
• ✓ No recursion #16

  The nameservers do not answer recursive queries for other domains.
• !

  Software version disclosed

  These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: nspub.ihes.fr: "9.18.49-1~deb12u2-Debian"; seven.ihes.fr: "9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.16". Hide or replace the version string.

  #17
• ✓ Zone transfers refused #18

  No nameserver allows a zone transfer to the public.
• ✓ TCP supported #19

  All nameservers answer over TCP.
• ✓ EDNS supported #20

  All nameservers support EDNS(0).
• ✓ Public addresses #21

  All nameserver addresses are publicly routable.

serial 2026101501 · primary nspub.ihes.fr

Found

Primary (MNAME)

nspub.ihes.fr

Contact (RNAME)

info.ihes.fr

Serial

2026101501

Refresh / retry

21600 s / 3600 s

Expire

3600 s

Negative TTL

600 s

Serial per nameserver

Checks

• ✓ Serial 2026101501 everywhere #22

  All nameservers serve the same version of the zone.
• !

  Unusual SOA timers

  expire 1h is shorter than 7d; secondaries stop answering too soon when the primary is down; expire 1h must be longer than refresh + retry. Current values: refresh 6h, retry 1h, expire 1h, negative TTL 10m.

  #23
• ✓ Primary is a public nameserver #24

  The primary nameserver nspub.ihes.fr is one of the listed nameservers.
• ✓ Contact info@ihes.fr #25

  The SOA RNAME info.ihes.fr means info@ihes.fr.
• ✓ Date-based serial #26

  The serial 2026101501 follows the YYYYMMDDnn convention (2026-10-15).

Not signed

Found

Validated by resolver

no

Checks

• !

  Not signed

  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.

  #27