nationalgeographic.com

Checked 22 October 2026, 10:00 UTC · via 8.8.8.8
!Passed with warnings
25 passed 3 warnings 0 failed 3 info

Registration

info

.com generic · CSC Corporate Domains, Inc. · expires 2027-10-09

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSC Corporate Domains, Inc.
Registered
10 October 1995
Last changed
9 September 2026
Expires
9 October 2027
Status
client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
ns106.twdcns.co.uk, ns106.twdcns.com, ns106.twdcns.net, ns106.twdcns.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 2027-10-09 #3
    The registration is valid until 2027-10-09 (351 days).
  • ✓ Transfer locked #4
    Registry status: client transfer 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

warn

ns106.twdcns.co.uk, ns106.twdcns.com, ns106.twdcns.net, ns106.twdcns.org

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns106.twdcns.co.uk, ns106.twdcns.com, ns106.twdcns.net, ns106.twdcns.org
NS in the zone
ns106.twdcns.co.uk, ns106.twdcns.com, ns106.twdcns.net, ns106.twdcns.org
NameserverAddressesNetwork (AS)Glue
ns106.twdcns.co.uk205.251.198.58 2600:9000:5306:3a00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns106.twdcns.com205.251.192.163 2600:9000:5300:a300::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US205.251.192.163
ns106.twdcns.net205.251.195.215 2600:9000:5303:d700::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns106.twdcns.org205.251.197.231 2600:9000:5305:e700::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns106.twdcns.co.uk, ns106.twdcns.com, ns106.twdcns.net, ns106.twdcns.org.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • !
    Glue differs from the zone
    The addresses at the parent (glue) differ from the addresses in the zone: ns106.twdcns.com (glue 205.251.192.163, zone 205.251.192.163, 2600:9000:5300:a300::1). Update the glue at your registrar.
    #8
  • ✓ 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 (AS16509 (AMAZON-02 - Amazon.com, 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
  • ✓ Nameserver names under 4 TLDs #12
    Nameserver names use the TLDs .com, .net, .org, .uk.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns106.twdcns.co.uk 205.251.198.58NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns106.twdcns.co.uk 2600:9000:5306:3a00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns106.twdcns.com 205.251.192.163NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns106.twdcns.com 2600:9000:5300:a300::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns106.twdcns.net 205.251.195.215NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns106.twdcns.net 2600:9000:5303:d700::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns106.twdcns.org 205.251.197.231NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns106.twdcns.org 2600:9000:5305:e700::1NOERROR, 4 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 1 · primary ns106.twdcns.co.uk

Found

Primary (MNAME)
ns106.twdcns.co.uk
Contact (RNAME)
awsdns-hostmaster.amazon.com
Serial
1
Refresh / retry
7200 s / 900 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns106.twdcns.co.uk (205.251.198.58)1
ns106.twdcns.co.uk (2600:9000:5306:3a00::1)1
ns106.twdcns.com (205.251.192.163)1
ns106.twdcns.com (2600:9000:5300:a300::1)1
ns106.twdcns.net (205.251.195.215)1
ns106.twdcns.net (2600:9000:5303:d700::1)1
ns106.twdcns.org (205.251.197.231)1
ns106.twdcns.org (2600:9000:5305:e700::1)1

Checks

  • ✓ Serial 1 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, retry 15m, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns106.twdcns.co.uk is one of the listed nameservers.
  • ✓ Contact awsdns-hostmaster@amazon.com #25
    The SOA RNAME awsdns-hostmaster.amazon.com means awsdns-hostmaster@amazon.com.
  • ✓ Counter serial #26
    The serial 1 is a plain counter.

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

21 records at the apex

Found

Read from
205.251.198.58:53
TypeValueTTL
SOAns106.twdcns.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns106.twdcns.co.uk.300
NSns106.twdcns.com.300
NSns106.twdcns.net.300
NSns106.twdcns.org.300
A18.66.102.11560
A18.66.102.2360
A18.66.102.660
A18.66.102.3860
MX5 nationalgeographic-com.mail.protection.outlook.com.300
TXT"9195-5BC8-D200-7A47-EFEA-C1F2-B395-F11A"300
TXT"MS=ms92025546"300
TXT"adobe-idp-site-verification=012b7d24aff9766444b9232173abb52ef026139e50aac77c49e02bd5d0dc3916"300
TXT"atlassian-domain-verification=5lqJwtfJPMHqC/aGvT/7s2BR53IHCs9P6vFjCQYA5nkQ4mvoHKTqNTW7gucscGW7"300
TXT"bryjbbw9c7tlwwfcvhbrh2mbx5f489q9"300
TXT"facebook-domain-verification=s2vntb2m7i6eo2t3r7wrfwehg5ojke"300
TXT"fastly-domain-delegation-fdeltDD-10.11.22"300
TXT"google-site-verification=3ddAnvA03i2p9Lp8gi0kSQeeasEPjz3905WhMhbWSNU"300
TXT"google-site-verification=5WNnmPMKPkvtFdhx94xNnsjdVQhTlvYGo0g0iF2nh7Y"300
TXT"v=spf1 include:spf.disney.com -all"300
TXT"zendeskverification=fc192359b34448e4"300

Checks

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