web.facebook.com

Zone facebook.com · Checked 22 October 2026, 11:24 UTC · via 8.8.8.8
!Passed with warnings
26 passed 2 warnings 0 failed 3 info

Registration

info

.com generic · RegistrarSafe, LLC · expires 2034-03-30

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
RegistrarSafe, LLC
Registered
29 March 1997
Last changed
23 April 2025
Expires
30 March 2034
Status
client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
a.ns.facebook.com, b.ns.facebook.com, c.ns.facebook.com, d.ns.facebook.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 2034-03-30 #3
    The registration is valid until 2034-03-30 (2715 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

a.ns.facebook.com, b.ns.facebook.com, c.ns.facebook.com, d.ns.facebook.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
a.ns.facebook.com, b.ns.facebook.com, c.ns.facebook.com, d.ns.facebook.com
NS in the zone
a.ns.facebook.com, b.ns.facebook.com, c.ns.facebook.com, d.ns.facebook.com
NameserverAddressesNetwork (AS)Glue
a.ns.facebook.com129.134.30.12 2a03:2880:f0fc:c:face:b00c:0:35AS32934 FACEBOOK - Facebook, Inc., US AS32934 FACEBOOK - Facebook, Inc., US129.134.30.12 2a03:2880:f0fc:c:face:b00c:0:35
b.ns.facebook.com129.134.31.12 2a03:2880:f0fd:c:face:b00c:0:35AS32934 FACEBOOK - Facebook, Inc., US AS32934 FACEBOOK - Facebook, Inc., US129.134.31.12 2a03:2880:f0fd:c:face:b00c:0:35
c.ns.facebook.com185.89.218.12 2a03:2880:f1fc:c:face:b00c:0:35AS32934 FACEBOOK - Facebook, Inc., US AS32934 FACEBOOK - Facebook, Inc., US185.89.218.12 2a03:2880:f1fc:c:face:b00c:0:35
d.ns.facebook.com185.89.219.12 2a03:2880:f1fd:c:face:b00c:0:35AS32934 FACEBOOK - Facebook, Inc., US AS32934 FACEBOOK - Facebook, Inc., US185.89.219.12 2a03:2880:f1fd:c:face:b00c:0:35

Checks

  • ✓ 4 nameservers #6
    Delegated to a.ns.facebook.com, b.ns.facebook.com, c.ns.facebook.com, d.ns.facebook.com.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: a.ns.facebook.com, b.ns.facebook.com, c.ns.facebook.com, d.ns.facebook.com.
  • ✓ 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 4 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS32934 (FACEBOOK - Facebook, Inc., US): 8 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

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a.ns.facebook.com 129.134.30.12NOERROR, 4 ms, authoritativenoyes / yesrefused-
a.ns.facebook.com 2a03:2880:f0fc:c:face:b00c:0:35NOERROR, 4 ms, authoritativenoyes / yesrefused-
b.ns.facebook.com 129.134.31.12NOERROR, 10 ms, authoritativenoyes / yesrefused-
b.ns.facebook.com 2a03:2880:f0fd:c:face:b00c:0:35NOERROR, 13 ms, authoritativenoyes / yesrefused-
c.ns.facebook.com 185.89.218.12NOERROR, 18 ms, authoritativenoyes / yesrefused-
c.ns.facebook.com 2a03:2880:f1fc:c:face:b00c:0:35NOERROR, 19 ms, authoritativenoyes / yesrefused-
d.ns.facebook.com 185.89.219.12NOERROR, 35 ms, authoritativenoyes / yesrefused-
d.ns.facebook.com 2a03:2880:f1fd:c:face:b00c:0:35NOERROR, 35 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 8 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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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 4207849484 · primary a.ns.facebook.com

Found

Primary (MNAME)
a.ns.facebook.com
Contact (RNAME)
dns.facebook.com
Serial
4207849484
Refresh / retry
14400 s / 1800 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
a.ns.facebook.com (129.134.30.12)4207849484
a.ns.facebook.com (2a03:2880:f0fc:c:face:b00c:0:35)4207849484
b.ns.facebook.com (129.134.31.12)4207849484
b.ns.facebook.com (2a03:2880:f0fd:c:face:b00c:0:35)4207849484
c.ns.facebook.com (185.89.218.12)4207849484
c.ns.facebook.com (2a03:2880:f1fc:c:face:b00c:0:35)4207849484
d.ns.facebook.com (185.89.219.12)4207849484
d.ns.facebook.com (2a03:2880:f1fd:c:face:b00c:0:35)4207849484

Checks

  • ✓ Serial 4207849484 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 30m, expire 7d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a.ns.facebook.com is one of the listed nameservers.
  • ✓ Contact dns@facebook.com #25
    The SOA RNAME dns.facebook.com means dns@facebook.com.
  • ✓ Timestamp serial #26
    The serial 4207849484 is a Unix timestamp (2103-05-05 23:04 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

warn

17 records at the apex

Found

Read from
129.134.30.12:53
TypeValueTTL
SOAa.ns.facebook.com. dns.facebook.com. 4207849484 14400 1800 604800 3003600
NSc.ns.facebook.com.172800
NSd.ns.facebook.com.172800
NSb.ns.facebook.com.172800
NSa.ns.facebook.com.172800
A57.144.244.160
AAAA2a03:2880:f37a:1:face:b00c:0:25de60
MX10 smtpin.vvv.facebook.com.3600
TXT"zoom-domain-verification=4b2ef4e1-6dee-4483-9869-9bef353fd147"3600
TXT"google-site-verification=sK6uY9x7eaMoEMfn3OILqwTFYgaNp4llmguKI-C3_iA"7200
TXT"google-site-verification=wdH5DTJTc9AYNwVunSVFeK0hYDGUIEOGb-RReU6pJlY"7200
TXT"google-site-verification=A2WZWCNQHrGV_TWwKh6KHY90tY0SHZo_RnyMJoDaG0s"7200
TXT"facebook-domain-verification=y7isfmi3kzyg1r4wophh9vyb6pgbda"3600
TXT"zoom-domain-verification=ZOOM_verify_e6c41daeb8a04c56b2c1d1702e312f88"3600
TXT"hubspot-developer-verification=MzQ2OTc4NWYtNDNmNS00ZmFlLWE3YTUtMDEwOTllNmEyYWZm"3600
TXT"v=spf1 redirect=_spf.facebook.com"86400
CAA0 issue "digicert.com; account=271b0beda0771d006aa3a6c11b05187d456d6c239b46cb5241196095b09c92af"3600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m), AAAA (1m). Low TTLs are useful just before a planned change.
    #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: digicert.com.