Domain report: supelec.fr

Registration

info

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

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: ns1-metz.centralesupelec.fr, ns1-rennes.centralesupelec.fr, ns1-saclay.centralesupelec.fr
RDAP server: https://rdap.nic.fr/

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.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).
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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.

warn

ns1-metz.centralesupelec.fr, ns1-rennes.centralesupelec.fr, ns1-saclay.centralesupelec.fr

Parent zone: fr
Delegation from: d.nic.fr (194.0.9.1)
NS at the parent: ns1-metz.centralesupelec.fr, ns1-rennes.centralesupelec.fr, ns1-saclay.centralesupelec.fr
NS in the zone: ns1-metz.centralesupelec.fr, ns1-rennes.centralesupelec.fr, ns1-saclay.centralesupelec.fr

Nameserver	Addresses	Network (AS)	Glue
ns1-metz.centralesupelec.fr	193.48.224.3	AS2200 FR-RENATER - Renater, FR	193.48.224.3
ns1-rennes.centralesupelec.fr	193.54.192.54	AS2200 FR-RENATER - Renater, FR	193.54.192.54
ns1-saclay.centralesupelec.fr	138.195.193.12	AS2200 FR-RENATER - Renater, FR	138.195.193.12

✓ 3 nameservers #6

Delegated to ns1-metz.centralesupelec.fr, ns1-rennes.centralesupelec.fr, ns1-saclay.centralesupelec.fr.
✓ 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 3 IPv4 /24s and 0 IPv6 /48s.
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All nameservers in one AS

All nameserver addresses are announced by one network operator (AS2200 (FR-RENATER - Renater, FR): 3 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

#11
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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
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No IPv6

None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.

#13

info

3 of 3 addresses answer authoritatively

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1-metz.centralesupelec.fr 193.48.224.3	NOERROR, 22 ms, authoritative	no	yes / yes	refused	Not available
ns1-rennes.centralesupelec.fr 193.54.192.54	NOERROR, 21 ms, authoritative	no	yes / yes	refused	Not available
ns1-saclay.centralesupelec.fr 138.195.193.12	NOERROR, 16 ms, authoritative	no	yes / yes	refused	Not available

✓ All respond #14

All 3 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.
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Identifying string disclosed

These nameservers answer version queries with a string that is not a version number: ns1-metz.centralesupelec.fr: "Not available"; ns1-rennes.centralesupelec.fr: "Not available"; ns1-saclay.centralesupelec.fr: "Not available".

#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.

info

serial 2025112401 · primary ns.centralesupelec.fr

Nameserver	Serial
ns1-metz.centralesupelec.fr (193.48.224.3)	2025112401
ns1-rennes.centralesupelec.fr (193.54.192.54)	2025112401
ns1-saclay.centralesupelec.fr (138.195.193.12)	2025112401

✓ Serial 2025112401 everywhere #22

All nameservers serve the same version of the zone.
✓ Timers within recommendations #23

SOA refresh 6h, retry 1h, expire 1000h, negative TTL 1d.
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Hidden master

The primary nameserver ns.centralesupelec.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 hostmaster@centralesupelec.fr #25

The SOA RNAME hostmaster.centralesupelec.fr means hostmaster@centralesupelec.fr.
✓ Date-based serial #26

The serial 2025112401 follows the YYYYMMDDnn convention (2025-11-24).

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Not signed

info

7 records at the apex

Type	Value	TTL
SOA	ns.centralesupelec.fr. hostmaster.centralesupelec.fr. 2025112401 21600 3600 3600000 86400	172800
NS	ns1-metz.centralesupelec.fr.	172800
NS	ns1-saclay.centralesupelec.fr.	172800
NS	ns1-rennes.centralesupelec.fr.	172800
MX	10 mx1.relay.renater.fr.	259200
MX	10 mx2.relay.renater.fr.	259200
TXT	"v=spf1 include:centralesupelec.fr ~all"	300

✓ TTLs within range #32

TTLs: MX 3d, NS 2d. The NS TTL at the parent is 1h and in the zone 2d; 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.
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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