crdp-strasbourg.fr

Checked 22 October 2026, 02:27 UTC · via 8.8.8.8
✗Problems found
19 passed 3 warnings 3 failed 6 info

Registration

info

.fr country-code · GIP RENATER · expires 2027-06-26

Found

TLD
.fr (country-code)
ICANN policies apply
no
Registrar
GIP RENATER
Registered
5 April 2001
Last changed
31 July 2026
Expires
26 June 2027
Status
active
Registry nameservers
ns1.crdp-strasbourg.fr, ns1.u-strasbg.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 2027-06-26 #3
    The registration is valid until 2027-06-26 (247 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.crdp-strasbourg.fr, ns1.u-strasbg.fr

Found

Parent zone
fr
Delegation from
d.nic.fr (194.0.9.1)
NS at the parent
ns1.crdp-strasbourg.fr, ns1.u-strasbg.fr
NS in the zone
ns1.crdp-strasbourg.fr, ns1.u-strasbg.fr, ns2.ac-strasbourg.fr
NameserverAddressesNetwork (AS)Glue
ns1.crdp-strasbourg.fr194.254.4.10AS2200 FR-RENATER - Renater, FR194.254.4.10
ns1.u-strasbg.fr130.79.200.1 2001:660:2402::1AS2259 FR-RAREST - Renater, EU AS2200 FR-RENATER - Renater, FR130.79.200.1 2001:660:2402::1
ns2.ac-strasbourg.fr (zone only)194.254.4.11 2001:660:470f::2AS2200 FR-RENATER - Renater, FR AS2200 FR-RENATER - Renater, FR-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.crdp-strasbourg.fr, ns1.u-strasbg.fr.
    #6
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only in the zone: ns2.ac-strasbourg.fr. ns1.crdp-strasbourg.fr, ns2.ac-strasbourg.fr report NS ns1.crdp-strasbourg.fr ns1.u-strasbg.fr ns2.ac-strasbourg.fr.
    #7
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns1.crdp-strasbourg.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 2 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS2200 (FR-RENATER - Renater, FR): 4 addresses; AS2259 (FR-RAREST - Renater, EU): 1 address.
  • 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: ns1.crdp-strasbourg.fr.
    #13

Nameservers

fail

3 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.crdp-strasbourg.fr 194.254.4.10NOERROR, 30 ms, authoritativenoyes / yesrefusedDNS
ns1.u-strasbg.fr 130.79.200.1REFUSED, 23 ms, NOT authoritativenono / yesrefused9.20.24-1ubuntu0.4-Ubuntu
ns1.u-strasbg.fr 2001:660:2402::1REFUSED, 25 ms, NOT authoritativenono / yesrefused9.20.24-1ubuntu0.4-Ubuntu
ns2.ac-strasbourg.fr 194.254.4.11NOERROR, 29 ms, authoritativenoyes / yesrefusedDNS
ns2.ac-strasbourg.fr 2001:660:470f::2NOERROR, 26 ms, authoritativenoyes / yesALLOWED (38 records)DNS

Checks

  • ✓ All respond #14
    All 5 nameserver addresses answered.
  • ✗
    Lame delegation
    These nameservers don't answer authoritatively for the zone, so resolvers ignore them: ns1.u-strasbg.fr (130.79.200.1): REFUSED, authoritative=false; ns1.u-strasbg.fr (2001:660:2402::1): REFUSED, authoritative=false.
    #15
  • ✓ 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.u-strasbg.fr: "9.20.24-1ubuntu0.4-Ubuntu". Hide or replace the version string.
    #17
  • ✗
    Zone transfer allowed
    These nameservers send the complete zone to anyone who asks (AXFR), exposing all host names: ns2.ac-strasbourg.fr (2001:660:470f::2): 38 records. Restrict zone transfers to your secondary servers.
    #18
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns1.u-strasbg.fr (130.79.200.1): ; ns1.u-strasbg.fr (2001:660:2402::1): .
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2024020201 · primary ns1.crdp-strasbourg.fr

Found

Primary (MNAME)
ns1.crdp-strasbourg.fr
Contact (RNAME)
dnsmaster.ac-strasbourg.fr
Serial
2024020201
Refresh / retry
21600 s / 3600 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns1.crdp-strasbourg.fr (194.254.4.10)2024020201
ns2.ac-strasbourg.fr (194.254.4.11)2024020201
ns2.ac-strasbourg.fr (2001:660:470f::2)2024020201

Checks

  • ✓ Serial 2024020201 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 1h, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.crdp-strasbourg.fr is one of the listed nameservers.
  • ✓ Contact dnsmaster@ac-strasbourg.fr #25
    The SOA RNAME dnsmaster.ac-strasbourg.fr means dnsmaster@ac-strasbourg.fr.
  • ✓ Date-based serial #26
    The serial 2024020201 follows the YYYYMMDDnn convention (2024-02-02).

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

6 records at the apex

Found

Read from
194.254.4.10:53
TypeValueTTL
SOAns1.crdp-strasbourg.fr. dnsmaster.ac-strasbourg.fr. 2024020201 21600 3600 1209600 360086400
NSns1.crdp-strasbourg.fr.86400
NSns2.ac-strasbourg.fr.86400
NSns1.u-strasbg.fr.86400
MX0 mail.crdp-strasbourg.fr.86400
TXT"Zone crdp-strasbourg.fr"86400

Checks

  • ✓ TTLs within range #32
    TTLs: MX 1d, NS 1d. The NS TTL at the parent is 1h and in the zone 1d; 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