instragram.com

Checked 22 October 2026, 09:20 UTC · via 8.8.8.8
!Passed with warnings
25 passed 2 warnings 0 failed 4 info

Registration

info

.com generic · RegistrarSEC LLC · expires 2026-12-04

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
RegistrarSEC LLC
Registered
4 December 2010
Last changed
5 September 2025
Expires
4 December 2026
Status
client delete prohibited, client transfer prohibited, client 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 2026-12-04 #3
    The registration is valid until 2026-12-04 (42 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

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.
  • ✓ 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 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, 12 ms, authoritativenoyes / yesrefused-
b.ns.facebook.com 2a03:2880:f0fd:c:face:b00c:0:35NOERROR, 11 ms, authoritativenoyes / yesrefused-
c.ns.facebook.com 185.89.218.12NOERROR, 16 ms, authoritativenoyes / yesrefused-
c.ns.facebook.com 2a03:2880:f1fc:c:face:b00c:0:35NOERROR, 17 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
3600 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 1h.
  • ✓ 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

8 records at the apex

Found

Read from
129.134.30.12:53
TypeValueTTL
SOAa.ns.facebook.com. dns.facebook.com. 4207849484 14400 1800 604800 36003600
NSb.ns.facebook.com.172800
NSd.ns.facebook.com.172800
NSc.ns.facebook.com.172800
NSa.ns.facebook.com.172800
A57.144.244.14160
AAAA2a03:2880:f37a:8d:face:b00c:0:260
TXT"v=spf1 -all"7200

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.
  • 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