paris-sorbonne.fr

Checked 22 October 2026, 04:43 UTC · via 8.8.8.8
✗Problems found
21 passed 3 warnings 2 failed 5 info

Registration

info

.fr country-code · GIP RENATER · expires 2027-01-31

Found

TLD
.fr (country-code)
ICANN policies apply
no
Registrar
GIP RENATER
Registered
31 January 2005
Last changed
28 February 2026
Expires
31 January 2027
Status
active
Registry nameservers
ns1.paris-sorbonne.fr, ns2.paris-sorbonne.fr, ns3.paris-sorbonne.fr
RDAP server
https://rdap.nic.fr/

Checks

  • i
    .fr is a country-code TLD (ccTLD)
    Country-code TLD: governed by its local registry under national policy, not by an ICANN contract. Registrar accreditation, dispute resolution and RDAP/WHOIS rules are set by the registry.
    #1
  • ✓ TLD delegated and signed #2
    .fr is delegated in the root zone and DNSSEC-signed.
  • ✓ Expires on 2027-01-31 #3
    The registration is valid until 2027-01-31 (101 days).
  • i
    No transfer lock
    The domain has no transfer lock (status: active). A registrar lock protects against unauthorized transfers.
    #4
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

warn

ns1.paris-sorbonne.fr, ns2.paris-sorbonne.fr, ns3.paris-sorbonne.fr

Found

Parent zone
fr
Delegation from
d.nic.fr (194.0.9.1)
NS at the parent
ns1.paris-sorbonne.fr, ns2.paris-sorbonne.fr, ns3.paris-sorbonne.fr
NS in the zone
ns0.paris-sorbonne.fr, ns0.sorbonne-universite.fr, ns1.paris-sorbonne.fr, ns1.sorbonne-universite.fr, ns2.paris-sorbonne.fr, ns3.paris-sorbonne.fr
NameserverAddressesNetwork (AS)Glue
ns0.paris-sorbonne.fr (zone only)195.220.216.41AS2200 FR-RENATER - Renater, FR-
ns0.sorbonne-universite.fr (zone only)134.157.23.111AS1307 UNSPECIFIED - Renater, EU-
ns1.paris-sorbonne.fr195.220.216.26AS2200 FR-RENATER - Renater, FR195.220.216.26
ns1.sorbonne-universite.fr (zone only)195.220.216.144AS2200 FR-RENATER - Renater, FR-
ns2.paris-sorbonne.fr195.220.216.27AS2200 FR-RENATER - Renater, FR195.220.216.27
ns3.paris-sorbonne.fr195.220.209.19AS2200 FR-RENATER - Renater, FR195.220.209.19

Checks

  • ✓ 3 nameservers #6
    Delegated to ns1.paris-sorbonne.fr, ns2.paris-sorbonne.fr, ns3.paris-sorbonne.fr.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only in the zone: ns0.paris-sorbonne.fr, ns0.sorbonne-universite.fr, ns1.sorbonne-universite.fr. ns0.sorbonne-universite.fr, ns1.paris-sorbonne.fr, ns1.sorbonne-universite.fr report NS ns0.paris-sorbonne.fr ns0.sorbonne-universite.fr ns1.paris-sorbonne.fr ns1.sorbonne-universite.fr ns2.paris-sorbonne.fr ns3.paris-sorbonne.fr.
    #7
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns1.paris-sorbonne.fr, ns2.paris-sorbonne.fr, ns3.paris-sorbonne.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: AS1307 (UNSPECIFIED - Renater, EU): 1 address; AS2200 (FR-RENATER - Renater, FR): 5 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

Nameservers

fail

3 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns0.paris-sorbonne.fr 195.220.216.41no responsenono / no--
ns0.sorbonne-universite.fr 134.157.23.111NOERROR, 15 ms, authoritativenono / yesrefused-
ns1.paris-sorbonne.fr 195.220.216.26NOERROR, 17 ms, authoritativenoyes / yesrefused9.16.48-Debian
ns1.sorbonne-universite.fr 195.220.216.144NOERROR, 17 ms, authoritativenoyes / yesrefused-
ns2.paris-sorbonne.fr 195.220.216.27no responsenono / no--
ns3.paris-sorbonne.fr 195.220.209.19no responsenono / no--

Checks

  • ✗
    Nameservers not responding
    These addresses did not answer, so resolvers waste time on timeouts: ns0.paris-sorbonne.fr (195.220.216.41): read udp 46.225.38.91:55175->195.220.216.41:53: i/o timeout; ns2.paris-sorbonne.fr (195.220.216.27): read udp 46.225.38.91:45680->195.220.216.27:53: read: no route to host; ns3.paris-sorbonne.fr (195.220.209.19): read udp 46.225.38.91:35536->195.220.209.19:53: i/o timeout.
    #14
  • ✓ 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: ns1.paris-sorbonne.fr: "9.16.48-Debian". Hide or replace the version string.
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns0.sorbonne-universite.fr (134.157.23.111): dial tcp 134.157.23.111:53: i/o timeout.
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 1474835 · primary ns0.sorbonne-universite.fr

Found

Primary (MNAME)
ns0.sorbonne-universite.fr
Contact (RNAME)
hostmaster.paris-sorbonne.fr
Serial
1474835
Refresh / retry
21600 s / 3600 s
Expire
604800 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
ns0.sorbonne-universite.fr (134.157.23.111)1474835
ns1.paris-sorbonne.fr (195.220.216.26)1474835
ns1.sorbonne-universite.fr (195.220.216.144)1474835

Checks

  • ✓ Serial 1474835 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 1h, expire 7d, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns0.sorbonne-universite.fr is one of the listed nameservers.
  • ✓ Contact hostmaster@paris-sorbonne.fr #25
    The SOA RNAME hostmaster.paris-sorbonne.fr means hostmaster@paris-sorbonne.fr.
  • ✓ Counter serial #26
    The serial 1474835 is a plain counter.

DNSSEC

info

Not signed

Found

Validated by resolver
no
Lookup error: read udp 46.225.38.91:47010->134.157.23.111:53: i/o timeout

Checks

  • i
    Could not be checked
    The DNSSEC lookup failed, so this could not be checked: read udp 46.225.38.91:47010->134.157.23.111:53: i/o timeout
    #27

Records

info

8 records at the apex

Found

Read from
134.157.23.111:53
TypeValueTTL
NSns3.paris-sorbonne.fr.600
NSns1.sorbonne-universite.fr.600
NSns0.sorbonne-universite.fr.600
NSns0.paris-sorbonne.fr.600
NSns1.paris-sorbonne.fr.600
NSns2.paris-sorbonne.fr.600
MX50 mx2.relay.renater.fr.600
MX50 mx1.relay.renater.fr.600

Checks

  • ✓ TTLs within range #32
    TTLs: MX 10m, NS 10m. The NS TTL at the parent is 1h and in the zone 10m; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • i
    No CAA records
    Without CAA records any certificate authority may issue certificates for this domain. A CAA record limits issuance to the CAs you use.
    #35