wikipedia.com

Checked 22 October 2026, 11:31 UTC · via 8.8.8.8
!Passed with warnings
25 passed 2 warnings 0 failed 4 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-01-10

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
13 January 2001
Last changed
9 December 2025
Expires
10 January 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
ns0.wikimedia.org, ns1.wikimedia.org, ns2.wikimedia.org
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 2027-01-10 #3
    The registration is valid until 2027-01-10 (79 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, client update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns0.wikimedia.org, ns1.wikimedia.org, ns2.wikimedia.org

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns0.wikimedia.org, ns1.wikimedia.org, ns2.wikimedia.org
NS in the zone
ns0.wikimedia.org, ns1.wikimedia.org, ns2.wikimedia.org
NameserverAddressesNetwork (AS)Glue
ns0.wikimedia.org208.80.154.238 2620:0:861:53::1AS14907 WIKIMEDIA - Wikimedia Foundation Inc., US AS14907 WIKIMEDIA - Wikimedia Foundation Inc., US-
ns1.wikimedia.org208.80.153.231 2620:0:860:53::1AS14907 WIKIMEDIA - Wikimedia Foundation Inc., US AS14907 WIKIMEDIA - Wikimedia Foundation Inc., US-
ns2.wikimedia.org198.35.27.27 2a02:ec80:53::1AS14907 WIKIMEDIA - Wikimedia Foundation Inc., US AS14907 WIKIMEDIA - Wikimedia Foundation Inc., US-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns0.wikimedia.org, ns1.wikimedia.org, ns2.wikimedia.org.
  • ✓ 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 3 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS14907 (WIKIMEDIA - Wikimedia Foundation Inc., US): 6 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 .org
    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

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns0.wikimedia.org 208.80.154.238NOERROR, 100 ms, authoritativenoyes / yesrefusedgdnsd/X
ns0.wikimedia.org 2620:0:861:53::1NOERROR, 114 ms, authoritativenoyes / yesrefusedgdnsd/X
ns1.wikimedia.org 208.80.153.231NOERROR, 132 ms, authoritativenoyes / yesrefusedgdnsd/X
ns1.wikimedia.org 2620:0:860:53::1NOERROR, 138 ms, authoritativenoyes / yesrefusedgdnsd/X
ns2.wikimedia.org 198.35.27.27NOERROR, 19 ms, authoritativenoyes / yesrefusedgdnsd/X
ns2.wikimedia.org 2a02:ec80:53::1NOERROR, 20 ms, authoritativenoyes / yesrefusedgdnsd/X

Checks

  • ✓ All respond #14
    All 6 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: ns0.wikimedia.org: "gdnsd/X"; ns1.wikimedia.org: "gdnsd/X"; ns2.wikimedia.org: "gdnsd/X".
    #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 2025101808 · primary ns0.wikimedia.org

Found

Primary (MNAME)
ns0.wikimedia.org
Contact (RNAME)
hostmaster.wikimedia.org
Serial
2025101808
Refresh / retry
43200 s / 7200 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns0.wikimedia.org (208.80.154.238)2025101808
ns0.wikimedia.org (2620:0:861:53::1)2025101808
ns1.wikimedia.org (208.80.153.231)2025101808
ns1.wikimedia.org (2620:0:860:53::1)2025101808
ns2.wikimedia.org (198.35.27.27)2025101808
ns2.wikimedia.org (2a02:ec80:53::1)2025101808

Checks

  • ✓ Serial 2025101808 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 2h, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns0.wikimedia.org is one of the listed nameservers.
  • ✓ Contact hostmaster@wikimedia.org #25
    The SOA RNAME hostmaster.wikimedia.org means hostmaster@wikimedia.org.
  • ✓ Date-based serial #26
    The serial 2025101808 follows the YYYYMMDDnn convention (2025-10-18).

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

warn

9 records at the apex

Found

Read from
208.80.154.238:53
TypeValueTTL
SOAns0.wikimedia.org. hostmaster.wikimedia.org. 2025101808 43200 7200 1209600 36003600
NSns0.wikimedia.org.86400
NSns1.wikimedia.org.86400
NSns2.wikimedia.org.86400
A185.15.59.226180
AAAA2a02:ec80:300:ed1a::3180
TXT"v=spf1 -all"600
CAA0 iodef "mailto:dns-admin@wikimedia.org"600
CAA0 issue "letsencrypt.org"600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (3m), AAAA (3m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.
    #32
  • ✓ 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: letsencrypt.org.