emath.fr

Checked 22 October 2026, 02:43 UTC · via 8.8.8.8
!Passed with warnings
22 passed 3 warnings 0 failed 6 info

Registration

info

.fr country-code · GIP RENATER · expires 2027-04-25

Found

TLD
.fr (country-code)
ICANN policies apply
no
Registrar
GIP RENATER
Registered
24 April 1995
Last changed
31 May 2026
Expires
25 April 2027
Status
active
Registry nameservers
dns1.math.cnrs.fr, dns2.math.cnrs.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 2027-04-25 #3
    The registration is valid until 2027-04-25 (185 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

dns1.math.cnrs.fr, dns2.math.cnrs.fr

Found

Parent zone
fr
Delegation from
d.nic.fr (194.0.9.1)
NS at the parent
dns1.math.cnrs.fr, dns2.math.cnrs.fr
NS in the zone
dns1.math.cnrs.fr, dns2.math.cnrs.fr
NameserverAddressesNetwork (AS)Glue
dns1.math.cnrs.fr157.136.141.195AS2200 FR-RENATER - Renater, FR-
dns2.math.cnrs.fr129.88.178.163AS1942 FR-TIGRE - Renater, EU-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: dns1.math.cnrs.fr, dns2.math.cnrs.fr.
    #6
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ 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 2 IPv4 /24s and 0 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS1942 (FR-TIGRE - Renater, EU): 1 address; AS2200 (FR-RENATER - Renater, FR): 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
  • !
    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
dns1.math.cnrs.fr 157.136.141.195NOERROR, 19 ms, authoritativenoyes / yesrefused9.20.23
dns2.math.cnrs.fr 129.88.178.163NOERROR, 21 ms, authoritativenoyes / yesrefused9.20.23

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: dns1.math.cnrs.fr: "9.20.23"; dns2.math.cnrs.fr: "9.20.23". 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

info

serial 2 · primary dns0.math.cnrs.fr

Found

Primary (MNAME)
dns0.math.cnrs.fr
Contact (RNAME)
support.math.cnrs.fr
Serial
2
Refresh / retry
21600 s / 3600 s
Expire
3600000 s
Negative TTL
7200 s

Serial per nameserver

NameserverSerial
dns1.math.cnrs.fr (157.136.141.195)2
dns2.math.cnrs.fr (129.88.178.163)2

Checks

  • ✓ Serial 2 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 1h, expire 1000h, negative TTL 2h.
  • i
    Hidden master
    The primary nameserver dns0.math.cnrs.fr is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact support@math.cnrs.fr #25
    The SOA RNAME support.math.cnrs.fr means support@math.cnrs.fr.
  • ✓ Counter serial #26
    The serial 2 is a plain counter.

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
157.136.141.195:53
TypeValueTTL
SOAdns0.math.cnrs.fr. support.math.cnrs.fr. 2 21600 3600 3600000 7200300
NSdns2.math.cnrs.fr.300
NSdns1.math.cnrs.fr.300
A147.210.110.142300
MX0 smail.math.u-bordeaux.fr.300
TXT"v=spf1 include:spf.sendinblue.com mx include:math.cnrs.fr ?all"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, 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.
  • ✓ 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