crous-lyon.fr

Checked 22 October 2026, 02:28 UTC · via 8.8.8.8
!Passed with warnings
19 passed 6 warnings 0 failed 6 info

Registration

info

.fr country-code · GIP RENATER · expires 2027-02-07

Found

TLD
.fr (country-code)
ICANN policies apply
no
Registrar
GIP RENATER
Registered
4 August 1999
Last changed
31 March 2026
Expires
7 February 2027
Status
active
Registry nameservers
ns1.crous-lyon.fr, ns2.crous-lyon.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 2027-02-07 #3
    The registration is valid until 2027-02-07 (108 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.crous-lyon.fr, ns2.crous-lyon.fr

Found

Parent zone
fr
Delegation from
d.nic.fr (194.0.9.1)
NS at the parent
ns1.crous-lyon.fr, ns2.crous-lyon.fr
NS in the zone
ns1.crous-lyon.fr, ns2.crous-lyon.fr
NameserverAddressesNetwork (AS)Glue
ns1.crous-lyon.fr193.55.52.30AS2200 FR-RENATER - Renater, FR193.55.52.30
ns2.crous-lyon.fr193.55.52.28AS2200 FR-RENATER - Renater, FR193.55.52.28

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.crous-lyon.fr, ns2.crous-lyon.fr.
    #6
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns1.crous-lyon.fr, ns2.crous-lyon.fr.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • !
    Nameservers in one network
    all IPv4 addresses are in 193.55.52.0/24. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS2200 (FR-RENATER - Renater, FR): 2 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

Nameservers

warn

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.crous-lyon.fr 193.55.52.30NOERROR, 19 ms, authoritativenoyes / yesrefused9.20.29-1~deb13u1-Debian
ns2.crous-lyon.fr 193.55.52.28NOERROR, 23 ms, authoritativenoyes / yesrefused9.20.29-1~deb13u1-Debian

Checks

  • ✓ All respond #14
    All 2 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: ns1.crous-lyon.fr: "9.20.29-1~deb13u1-Debian"; ns2.crous-lyon.fr: "9.20.29-1~deb13u1-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.

SOA

warn

serial 2026101901 · primary ns1.crous-lyon.fr

Found

Primary (MNAME)
ns1.crous-lyon.fr
Contact (RNAME)
sinfo.crous-lyon.fr
Serial
2026101901
Refresh / retry
3600 s / 3600 s
Expire
60480000 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns1.crous-lyon.fr (193.55.52.30)2026101901
ns2.crous-lyon.fr (193.55.52.28)2026101901

Checks

  • ✓ Serial 2026101901 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    retry 1h should be shorter than refresh 1h. Current values: refresh 1h, retry 1h, expire 700d, negative TTL 1h.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.crous-lyon.fr is one of the listed nameservers.
  • ✓ Contact sinfo@crous-lyon.fr #25
    The SOA RNAME sinfo.crous-lyon.fr means sinfo@crous-lyon.fr.
  • ✓ Date-based serial #26
    The serial 2026101901 follows the YYYYMMDDnn convention (2026-10-19).

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

warn

12 records at the apex

Found

Read from
193.55.52.30:53
TypeValueTTL
SOAns1.crous-lyon.fr. sinfo.crous-lyon.fr. 2026101901 3600 3600 60480000 36003600
NSns1.crous-lyon.fr.3600
NSns2.crous-lyon.fr.3600
MX100 mx1.relay.renater.fr.0
MX100 mx2.relay.renater.fr.0
TXT"v=spf1 mx a:smtp.nuonet.fr ip4:194.57.108.9 include:spfa.alinto.net ip4:193.55.52.139 ip4:193.55.52.20 ip4:193.55.52.27 ip4:94.23.202.94/32 include:spf.protection.outlook.com include:spf.mailing.crous-rouen.fr include:spf.relay.renater.fr -all"3600
TXT"UTrPZiGRPK1uQ8LoBr2R1jFUm4+aDqxaaJZcmHMJlIGHUXe/UPO5H404wf9qb0pvhSvO42nXNaYZ36E5HFnSXg=="3600
TXT"HARICA-fvqR3CFfCc6CW5oZv3D"3600
TXT"MS=11B731F4208476A95BCE7C5C3152E9EC191A5B3C" "3600"3600
TXT"brevo-code:4e2090e872c1aaf85efae4b3c9e0b2bc"3600
TXT"3fZZt6sSabMbx4c3SqkNvbi6AEfQd16SBQHOLhx0BgBqO9uzQUmAFcnvk4xb6KRBDljQSjucBAzybjTb4T+mbw=="3600
TXT"MS=ms21571818" "3600"3600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: MX (0s). Low TTLs are useful just before a planned change.
    #32
  • ✓ 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