u-pem.fr

helios.univ-mlv.fr, saintex.univ-mlv.fr

Found

Parent zone

fr

Delegation from

d.nic.fr (194.0.9.1)

NS at the parent

helios.univ-mlv.fr, saintex.univ-mlv.fr

NS in the zone

helios.u-pem.fr, saintex.u-pem.fr

Checks

• i

  2 nameservers

  Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: helios.univ-mlv.fr, saintex.univ-mlv.fr.

  #6
• !

  NS sets differ

  The nameservers at the parent and in the zone should be the same. Only at the parent: helios.univ-mlv.fr, saintex.univ-mlv.fr; only in the zone: helios.u-pem.fr, saintex.u-pem.fr. helios.u-pem.fr, helios.univ-mlv.fr, saintex.u-pem.fr, saintex.univ-mlv.fr report NS helios.u-pem.fr saintex.u-pem.fr.

  #7
• ✓ No glue needed #8

  All nameservers are outside the zone, so no glue records are needed.
• ✓ 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 2 IPv4 /24s and 0 IPv6 /48s.
• i

  All nameservers in one AS

  All nameserver addresses are announced by one network operator (AS2200 (FR-RENATER - Renater, FR): 4 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

  #11
• 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: helios.u-pem.fr: "9.18.49-1~deb12u1-Debian"; helios.univ-mlv.fr: "9.18.49-1~deb12u1-Debian"; saintex.u-pem.fr: "9.10.3-P4-Debian"; saintex.univ-mlv.fr: "9.10.3-P4-Debian". 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 2026100604 · primary helios.u-pem.fr

Found

Primary (MNAME)

helios.u-pem.fr

Contact (RNAME)

adm-dns.u-pem.fr

Serial

2026100604

Refresh / retry

300 s / 3600 s

Expire

2419200 s

Negative TTL

86400 s

Serial per nameserver

Checks

• ✓ Serial 2026100604 everywhere #22

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

  Unusual SOA timers

  refresh 5m is outside 20m–1d; retry 1h should be shorter than refresh 5m. Current values: refresh 5m, retry 1h, expire 28d, negative TTL 1d.

  #23
• ✓ Primary is a public nameserver #24

  The primary nameserver helios.u-pem.fr is one of the listed nameservers.
• ✓ Contact adm-dns@u-pem.fr #25

  The SOA RNAME adm-dns.u-pem.fr means adm-dns@u-pem.fr.
• ✓ Date-based serial #26

  The serial 2026100604 follows the YYYYMMDDnn convention (2026-10-06).

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