ls2n.fr

Checked 22 October 2026, 04:07 UTC · via 8.8.8.8
✗Problems found
20 passed 2 warnings 2 failed 7 info

Registration

info

.fr country-code · GANDI · expires 2027-10-27

Found

TLD
.fr (country-code)
ICANN policies apply
no
Registrar
GANDI
Registered
27 October 2015
Last changed
24 May 2026
Expires
27 October 2027
Status
client transfer prohibited
Registry nameservers
dns1.univ-nantes.fr, dns2.univ-nantes.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 2027-10-27 #3
    The registration is valid until 2027-10-27 (370 days).
  • ✓ Transfer locked #4
    Registry status: client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

warn

dns1.univ-nantes.fr, dns2.univ-nantes.fr

Found

Parent zone
fr
Delegation from
d.nic.fr (194.0.9.1)
NS at the parent
dns1.univ-nantes.fr, dns2.univ-nantes.fr
NS in the zone
dns1.univ-nantes.fr, dns2.univ-nantes.fr, ipam-dns2-fr.univ-nantes.fr, vps-unicaen.unicaen.fr
NameserverAddressesNetwork (AS)Glue
dns1.univ-nantes.fr193.52.108.41 2001:660:7220:382::5353AS2200 FR-RENATER - Renater, FR AS2200 FR-RENATER - Renater, FR193.52.108.41 2001:660:7220:382::5353
dns2.univ-nantes.fr193.52.101.20AS2200 FR-RENATER - Renater, FR193.52.101.20
ipam-dns2-fr.univ-nantes.fr (zone only)193.52.108.46AS2200 FR-RENATER - Renater, FR-
vps-unicaen.unicaen.fr (zone only)51.210.107.144 2001:41d0:304:200::14dfAS16276 OVH - OVH SAS, FR AS16276 OVH - OVH SAS, FR-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: dns1.univ-nantes.fr, dns2.univ-nantes.fr.
    #6
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only in the zone: ipam-dns2-fr.univ-nantes.fr, vps-unicaen.unicaen.fr. dns1.univ-nantes.fr, dns2.univ-nantes.fr, ipam-dns2-fr.univ-nantes.fr report NS dns1.univ-nantes.fr dns2.univ-nantes.fr ipam-dns2-fr.univ-nantes.fr vps-unicaen.unicaen.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 3 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS16276 (OVH - OVH SAS, FR): 2 addresses; AS2200 (FR-RENATER - Renater, FR): 4 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: dns2.univ-nantes.fr, ipam-dns2-fr.univ-nantes.fr.
    #13

Nameservers

fail

4 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.univ-nantes.fr 193.52.108.41NOERROR, 21 ms, authoritativenoyes / yesrefuseduniv-nantes public DNS1 server
dns1.univ-nantes.fr 2001:660:7220:382::5353NOERROR, 21 ms, authoritativenoyes / yesrefuseduniv-nantes public DNS1 server
dns2.univ-nantes.fr 193.52.101.20NOERROR, 21 ms, authoritativenoyes / yesrefuseduniv-nantes public DNS2 server
ipam-dns2-fr.univ-nantes.fr 193.52.108.46NOERROR, 21 ms, authoritativenoyes / yesrefused-
vps-unicaen.unicaen.fr 51.210.107.144REFUSED, 16 ms, NOT authoritativenono / yesrefusedunknown
vps-unicaen.unicaen.fr 2001:41d0:304:200::14dfREFUSED, 16 ms, NOT authoritativenono / yesrefusedunknown

Checks

  • ✓ All respond #14
    All 6 nameserver addresses answered.
  • ✗
    Lame delegation
    These nameservers don't answer authoritatively for the zone, so resolvers ignore them: vps-unicaen.unicaen.fr (51.210.107.144): REFUSED, authoritative=false; vps-unicaen.unicaen.fr (2001:41d0:304:200::14df): REFUSED, authoritative=false.
    #15
  • ✓ No recursion #16
    The nameservers do not answer recursive queries for other domains.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: dns1.univ-nantes.fr: "univ-nantes public DNS1 server"; dns2.univ-nantes.fr: "univ-nantes public DNS2 server"; vps-unicaen.unicaen.fr: "unknown".
    #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: vps-unicaen.unicaen.fr (51.210.107.144): ; vps-unicaen.unicaen.fr (2001:41d0:304:200::14df): .
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2026022708 · primary ipam-dns2-fr.univ-nantes.fr

Found

Primary (MNAME)
ipam-dns2-fr.univ-nantes.fr
Contact (RNAME)
root.ls2n.fr
Serial
2026022708
Refresh / retry
1800 s / 600 s
Expire
1209600 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
dns1.univ-nantes.fr (193.52.108.41)2026022708
dns1.univ-nantes.fr (2001:660:7220:382::5353)2026022708
dns2.univ-nantes.fr (193.52.101.20)2026022708
ipam-dns2-fr.univ-nantes.fr (193.52.108.46)2026022708

Checks

  • ✓ Serial 2026022708 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 30m, retry 10m, expire 14d, negative TTL 30m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ipam-dns2-fr.univ-nantes.fr is one of the listed nameservers.
  • ✓ Contact root@ls2n.fr #25
    The SOA RNAME root.ls2n.fr means root@ls2n.fr.
  • ✓ Date-based serial #26
    The serial 2026022708 follows the YYYYMMDDnn convention (2026-02-27).

DNSSEC

warn

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

Records

info

11 records at the apex

Found

Read from
193.52.108.41:53
TypeValueTTL
SOAipam-dns2-fr.univ-nantes.fr. root.ls2n.fr. 2026022708 1800 600 1209600 1800300
NSvps-unicaen.unicaen.fr.300
NSipam-dns2-fr.univ-nantes.fr.300
NSdns1.univ-nantes.fr.300
NSdns2.univ-nantes.fr.300
A193.52.104.12300
AAAA2001:660:7220:386:193:52:104:123600
MX10 mx1.relay.renater.fr.300
MX10 mx2.relay.renater.fr.300
TXT"v=spf1 a:mailers.univ-nantes.fr ?all"300
TXT"arsen-verification=7f7ca5860a97b6cb9042475b9aff4939f57869671861f02c964626ab43a20ea9"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 1h, MX 5m, NS 5m. The NS TTL at the parent is 1h and in the zone 5m; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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