sb-roscoff.fr

Checked 22 October 2026, 05:10 UTC · via 8.8.8.8
✗Problems found
18 passed 2 warnings 5 failed 6 info

Registration

info

.fr country-code · GIP RENATER · expires 2026-12-31

Found

TLD
.fr (country-code)
ICANN policies apply
no
Registrar
GIP RENATER
Registered
31 December 1994
Last changed
31 January 2026
Expires
31 December 2026
Status
active
Registry nameservers
ns4.cnrs.fr, resone.univ-rennes1.fr, sbr.sb-roscoff.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 2026-12-31 #3
    The registration is valid until 2026-12-31 (70 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

fail

ns4.cnrs.fr, resone.univ-rennes1.fr, sbr.sb-roscoff.fr

Found

Parent zone
fr
Delegation from
d.nic.fr (194.0.9.1)
NS at the parent
ns4.cnrs.fr, resone.univ-rennes1.fr, sbr.sb-roscoff.fr
NS in the zone
ns1.sb-roscoff.fr, resone.univ-rennes1.fr.sb-roscoff.fr
NameserverAddressesNetwork (AS)Glue
ns1.sb-roscoff.fr (zone only)192.168.1.130--
ns4.cnrs.fr (parent only)195.220.197.11 2001:660:500a:2210::11AS2200 FR-RENATER - Renater, FR AS2200 FR-RENATER - Renater, FR-
resone.univ-rennes1.fr (parent only)129.20.254.1AS2200 FR-RENATER - Renater, FR129.20.254.1
resone.univ-rennes1.fr.sb-roscoff.fr (zone only)129.20.254.1AS2200 FR-RENATER - Renater, FR-
sbr.sb-roscoff.fr (parent only)(does not resolve)193.52.39.100

Checks

  • ✓ 3 nameservers #6
    Delegated to ns4.cnrs.fr, resone.univ-rennes1.fr, sbr.sb-roscoff.fr.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only at the parent: ns4.cnrs.fr, resone.univ-rennes1.fr, sbr.sb-roscoff.fr; only in the zone: ns1.sb-roscoff.fr, resone.univ-rennes1.fr.sb-roscoff.fr. resone.univ-rennes1.fr, resone.univ-rennes1.fr.sb-roscoff.fr report NS ns1.sb-roscoff.fr resone.univ-rennes1.fr.sb-roscoff.fr.
    #7
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: sbr.sb-roscoff.fr.
  • ✗
    Nameserver names don't resolve
    These nameservers have no A or AAAA record, so they can't be reached (lame delegation): sbr.sb-roscoff.fr.
    #9
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 3 IPv4 /24s and 1 IPv6 /48.
  • 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns1.sb-roscoff.fr, resone.univ-rennes1.fr, resone.univ-rennes1.fr.sb-roscoff.fr.
    #13

Nameservers

fail

2 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.sb-roscoff.fr 192.168.1.130no responsenono / no--
ns4.cnrs.fr 195.220.197.11REFUSED, 25 ms, NOT authoritativenono / yesrefusedSECRET
ns4.cnrs.fr 2001:660:500a:2210::11REFUSED, 25 ms, NOT authoritativenono / yesrefusedSECRET
resone.univ-rennes1.fr 129.20.254.1NOERROR, 20 ms, authoritativenoyes / yesrefused-
resone.univ-rennes1.fr.sb-roscoff.fr 129.20.254.1NOERROR, 19 ms, authoritativenoyes / yesrefused-

Checks

  • ✗
    Nameservers not responding
    These addresses did not answer, so resolvers waste time on timeouts: ns1.sb-roscoff.fr (192.168.1.130): read udp 46.225.38.91:57565->192.168.1.130:53: i/o timeout.
    #14
  • ✗
    Lame delegation
    These nameservers don't answer authoritatively for the zone, so resolvers ignore them: ns4.cnrs.fr (195.220.197.11): REFUSED, authoritative=false; ns4.cnrs.fr (2001:660:500a:2210::11): 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: ns4.cnrs.fr: "SECRET".
    #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: ns4.cnrs.fr (195.220.197.11): ; ns4.cnrs.fr (2001:660:500a:2210::11): .
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✗
    Private nameserver addresses
    These nameserver addresses can't be reached from the internet: ns1.sb-roscoff.fr (192.168.1.130).
    #21

SOA

pass

serial 2026101303 · primary ns1.sb-roscoff.fr

Found

Primary (MNAME)
ns1.sb-roscoff.fr
Contact (RNAME)
dnsmaster.sb-roscoff.fr
Serial
2026101303
Refresh / retry
10800 s / 120 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
resone.univ-rennes1.fr (129.20.254.1)2026101303
resone.univ-rennes1.fr.sb-roscoff.fr (129.20.254.1)2026101303

Checks

  • ✓ Serial 2026101303 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 2m, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.sb-roscoff.fr is one of the listed nameservers.
  • ✓ Contact dnsmaster@sb-roscoff.fr #25
    The SOA RNAME dnsmaster.sb-roscoff.fr means dnsmaster@sb-roscoff.fr.
  • ✓ Date-based serial #26
    The serial 2026101303 follows the YYYYMMDDnn convention (2026-10-13).

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

pass

15 records at the apex

Found

Read from
129.20.254.1:53
TypeValueTTL
SOAns1.sb-roscoff.fr. dnsmaster.sb-roscoff.fr. 2026101303 10800 120 604800 360010800
NSresone.univ-rennes1.fr.sb-roscoff.fr.10800
NSns1.sb-roscoff.fr.10800
MX50 mx1.relay.renater.fr.300
MX50 mx2.relay.renater.fr.300
TXT"HARICA-DjketxGdcGh4Yq3Urr8"10800
TXT"v=spf1 mx ip4:212.85.137.245 ip4:193.52.39.153 include:spf.relay.renater.fr ~all"10800
TXT"google-site-verification=vx0CSF1CRsK9W1Q7GyzxxptqbNfvzNY6NMluI9T_3no"10800
CAA0 issue "sectigo.com"10800
CAA0 issue "letsencrypt.org"10800
CAA0 issuewild "harica.gr"10800
CAA0 issuewild "sectigo.com"10800
CAA0 issue "harica.gr"10800
CAA0 issue "digicert.com"10800
CAA0 issuewild "digicert.com"10800

Checks

  • ✓ TTLs within range #32
    TTLs: MX 5m, NS 3h. The NS TTL at the parent is 1h and in the zone 3h; 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: sectigo.com, letsencrypt.org, harica.gr, digicert.com.