openclassrooms.com

Checked 22 October 2026, 10:10 UTC · via 8.8.8.8
!Passed with warnings
24 passed 2 warnings 0 failed 5 info

Registration

info

.com generic · Gandi SAS · expires 2027-12-05

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Gandi SAS
Registered
5 December 2008
Last changed
1 October 2026
Expires
5 December 2027
Status
client transfer prohibited
Registry nameservers
rob.ns.cloudflare.com, zara.ns.cloudflare.com
RDAP server
https://rdap.verisign.com/com/v1/

Checks

  • i
    .com is a generic TLD (gTLD)
    Generic TLD under an ICANN registry agreement: ICANN-accredited registrars, UDRP and RDAP apply.
    #1
  • ✓ TLD delegated and signed #2
    .com is delegated in the root zone and DNSSEC-signed.
  • ✓ Expires on 2027-12-05 #3
    The registration is valid until 2027-12-05 (409 days).
  • ✓ Transfer locked #4
    Registry status: client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

rob.ns.cloudflare.com, zara.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
rob.ns.cloudflare.com, zara.ns.cloudflare.com
NS in the zone
rob.ns.cloudflare.com, zara.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
rob.ns.cloudflare.com173.245.59.140 172.64.33.140 108.162.193.140 2803:f800:50::6ca2:c18c 2606:4700:58::adf5:3b8c 2a06:98c1:50::ac40:218cAS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US108.162.193.140 172.64.33.140 173.245.59.140 2606:4700:58::adf5:3b8c 2803:f800:50::6ca2:c18c 2a06:98c1:50::ac40:218c
zara.ns.cloudflare.com172.64.32.148 108.162.192.148 173.245.58.148 2803:f800:50::6ca2:c094 2a06:98c1:50::ac40:2094 2606:4700:50::adf5:3a94AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US108.162.192.148 172.64.32.148 173.245.58.148 2606:4700:50::adf5:3a94 2803:f800:50::6ca2:c094 2a06:98c1:50::ac40:2094

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: rob.ns.cloudflare.com, zara.ns.cloudflare.com.
    #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 6 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 12 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 .com
    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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
rob.ns.cloudflare.com 173.245.59.140NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
rob.ns.cloudflare.com 172.64.33.140NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
rob.ns.cloudflare.com 108.162.193.140NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
rob.ns.cloudflare.com 2803:f800:50::6ca2:c18cNOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
rob.ns.cloudflare.com 2606:4700:58::adf5:3b8cNOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
rob.ns.cloudflare.com 2a06:98c1:50::ac40:218cNOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
zara.ns.cloudflare.com 172.64.32.148NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
zara.ns.cloudflare.com 108.162.192.148NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
zara.ns.cloudflare.com 173.245.58.148NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
zara.ns.cloudflare.com 2803:f800:50::6ca2:c094NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
zara.ns.cloudflare.com 2a06:98c1:50::ac40:2094NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
zara.ns.cloudflare.com 2606:4700:50::adf5:3a94NOERROR, 7 ms, authoritativenoyes / yesrefused2026.10.2

Checks

  • ✓ All respond #14
    All 12 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: rob.ns.cloudflare.com: "2026.10.2"; zara.ns.cloudflare.com: "2026.10.2". 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

pass

serial 2418147389 · primary rob.ns.cloudflare.com

Found

Primary (MNAME)
rob.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2418147389
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
rob.ns.cloudflare.com (173.245.59.140)2418147389
rob.ns.cloudflare.com (172.64.33.140)2418147389
rob.ns.cloudflare.com (108.162.193.140)2418147389
rob.ns.cloudflare.com (2803:f800:50::6ca2:c18c)2418147389
rob.ns.cloudflare.com (2606:4700:58::adf5:3b8c)2418147389
rob.ns.cloudflare.com (2a06:98c1:50::ac40:218c)2418147389
zara.ns.cloudflare.com (172.64.32.148)2418147389
zara.ns.cloudflare.com (108.162.192.148)2418147389
zara.ns.cloudflare.com (173.245.58.148)2418147389
zara.ns.cloudflare.com (2803:f800:50::6ca2:c094)2418147389
zara.ns.cloudflare.com (2a06:98c1:50::ac40:2094)2418147389
zara.ns.cloudflare.com (2606:4700:50::adf5:3a94)2418147389

Checks

  • ✓ Serial 2418147389 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h46m40s, retry 40m, expire 7d, negative TTL 30m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver rob.ns.cloudflare.com is one of the listed nameservers.
  • ✓ Contact dns@cloudflare.com #25
    The SOA RNAME dns.cloudflare.com means dns@cloudflare.com.
  • ✓ Timestamp serial #26
    The serial 2418147389 is a Unix timestamp (2046-08-17 19:36 UTC).

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

34 records at the apex

Found

Read from
173.245.59.140:53
TypeValueTTL
SOArob.ns.cloudflare.com. dns.cloudflare.com. 2418147389 10000 2400 604800 18001800
NSrob.ns.cloudflare.com.86400
NSzara.ns.cloudflare.com.86400
A104.18.15.226300
A104.18.14.226300
AAAA2606:4700::6812:ee2300
AAAA2606:4700::6812:fe2300
MX1 smtp.google.com.300
TXT"Dynatrace-site-verification=022b23d9-99ed-4801-b628-de1712a28979__op1lvli1qhs0m4o2v7octr9u58"300
TXT"Kxf8htyU=c9682c5ba444c33cbf57e97be8cdb490"300
TXT"MS=ms14097912"300
TXT"Sendinblue-code:44c70bc1d5a742e2d07c6f8744ee4def"300
TXT"anthropic-domain-verification-57xn02=M4Y0ja58ox2a2MgzJTSzKKih6"300
TXT"apple-domain-verification=eLodIHj2vhR9lugh"300
TXT"atlassian-domain-verification=6gmMY7s1L92PhZ0M+Kr8bNk21XlKopm+aUvqNLjwWg9TL+zsoU7JrEivw/P460x8"300
TXT"atlassian-sending-domain-verification=9a4e7011-1022-40e9-85f2-42de81bd80f4"300
TXT"c2a481d1e8ef1df47149007842c2a448"300
TXT"dropbox-domain-verification=vbwmzx8pg6hx"300
TXT"facebook-domain-verification=etty6jmg2dug16uxir8r83bjpw12rz"300
TXT"figma-domain-verification=b4855041d333147a44dda6eb3d287c28c316516711d8a2c8a9dd1bf42f13c9ed-1728986686"300
TXT"google-site-verification=AUfXTxZiNMlJVUMEOV-rE-3qXXDzCs7bWKO1WAkSXsw"300
TXT"google-site-verification=D3uXyLElE31RCouIVVGvRonwT9TKKPYbpTEQRtQC5mM"300
TXT"google-site-verification=EUjYNeCS5YTXeAGwnptXDpbgHL7velgfPpy53rkkn-U"300
TXT"google-site-verification=_F1enPejZyv08M3rBrhfxdle_VpNSxxwxWdcGJRXzUk"300
TXT"google-site-verification=as773-Br6AbX2z0m4GFK707futD1TlTmWRxKpza2bus"300
TXT"google-site-verification=cjs3yTPWmtAmTITMK8HTVYXMolST1dEcMV_xcvGQqUo"300
TXT"heritage=external-dns,external-dns/owner=eks-app-production-eu-west-3,external-dns/resource=ingress/sdzv4-backend-production/backend-common"300
TXT"hubspot-domain-verification=MGE2NzA2MjQtM2E0Yi00YWZhLThmODUtZGQ1M2U3MTMzZmYz"300
TXT"jamf-site-verification=29mRdDTT40s4zdfglLhJxw"300
TXT"miro-verification=e3bf6738d9d0b093d6f376ec7083f7aa949b4ae9"300
TXT"openai-domain-verification=dv-Hr8OabWkfOrDkck63M0Acm2Q"300
TXT"teamviewer-sso-verification=5760bab05a3c4fbea95ee07dcb2fffef"300
TXT"v=spf1 include:mailgun.org include:_spf.salesforce.com include:mail.zendesk.com include:_spf.google.com ip4:54.174.16.18 ip4:52.201.1.182 ip4:34.206.74.100 ip4:35.156.188.4 ip4:35.156.118.121 ip4:35.158.156.37 ip4:18.195.44.92 ~all"300
TXT"wrike-verification=MTQwNTk1MjpmODUzZGUzMjZkYjZlNzYzZDM2NjQ2YmNiM2IyODM1MThlNjIzMzc5YWFhYTg5NzgwODM4NTE1NDQwOGM5MDRi"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 5m, NS 1d. The NS TTL at the parent is 2d 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