nbc.com

Checked 22 October 2026, 10:00 UTC · via 8.8.8.8
!Passed with warnings
22 passed 4 warnings 0 failed 5 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-06-16

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
17 June 1997
Last changed
15 May 2025
Expires
16 June 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
a1-196.akam.net, a13-66.akam.net, a16-65.akam.net, a2-64.akam.net, a22-64.akam.net, a7-66.akam.net
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 2027-06-16 #3
    The registration is valid until 2027-06-16 (236 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

a1-196.akam.net, a13-66.akam.net, a16-65.akam.net, a2-64.akam.net, a22-64.akam.net, a7-66.akam.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
a1-196.akam.net, a13-66.akam.net, a16-65.akam.net, a2-64.akam.net, a22-64.akam.net, a7-66.akam.net
NS in the zone
a1-196.akam.net, a13-66.akam.net, a16-65.akam.net, a2-64.akam.net, a22-64.akam.net, a7-66.akam.net
NameserverAddressesNetwork (AS)Glue
a1-196.akam.net193.108.91.196 2600:1401:2::c4AS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a13-66.akam.net2.22.230.66 2600:1480:800::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a16-65.akam.net23.211.132.65 2600:1406:1b::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a2-64.akam.net95.100.174.64 2600:1480:7000::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a22-64.akam.net23.211.61.64 2600:1480:7800::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a7-66.akam.net23.61.199.66 2600:1406:32::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-196.akam.net, a13-66.akam.net, a16-65.akam.net, a2-64.akam.net, a22-64.akam.net, a7-66.akam.net.
  • ✓ 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 6 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL): 1 address; AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 11 addresses.
  • i
    All nameserver names under .net
    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
a1-196.akam.net 193.108.91.196NOERROR, 3 ms, authoritativenoyes / yesrefused41824.7
a1-196.akam.net 2600:1401:2::c4NOERROR, 4 ms, authoritativenoyes / yesrefused41824.6
a13-66.akam.net 2.22.230.66NOERROR, 3 ms, authoritativenoyes / yesrefused41824.10
a13-66.akam.net 2600:1480:800::42NOERROR, 3 ms, authoritativenoyes / yesrefused41824.8
a16-65.akam.net 23.211.132.65NOERROR, 3 ms, authoritativenoyes / yesrefused48878.29
a16-65.akam.net 2600:1406:1b::41NOERROR, 4 ms, authoritativenoyes / yesrefused48878.33
a2-64.akam.net 95.100.174.64NOERROR, 4 ms, authoritativenoyes / yesrefused48878.26
a2-64.akam.net 2600:1480:7000::40NOERROR, 4 ms, authoritativenoyes / yesrefused48878.29
a22-64.akam.net 23.211.61.64NOERROR, 3 ms, authoritativenoyes / yesrefused48878.31
a22-64.akam.net 2600:1480:7800::40NOERROR, 4 ms, authoritativenoyes / yesrefused48878.26
a7-66.akam.net 23.61.199.66NOERROR, 3 ms, authoritativenoyes / yesrefused41824.4
a7-66.akam.net 2600:1406:32::42NOERROR, 4 ms, authoritativenoyes / yesrefused41824.6

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: a1-196.akam.net: "41824.7"; a1-196.akam.net: "41824.6"; a13-66.akam.net: "41824.10"; a13-66.akam.net: "41824.8"; a16-65.akam.net: "48878.29"; a16-65.akam.net: "48878.33"; a2-64.akam.net: "48878.26"; a2-64.akam.net: "48878.29"; a22-64.akam.net: "48878.31"; a22-64.akam.net: "48878.26"; a7-66.akam.net: "41824.4"; a7-66.akam.net: "41824.6". 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

warn

serial 2015121651 · primary ns1.nbcuni.com

Found

Primary (MNAME)
ns1.nbcuni.com
Contact (RNAME)
domain\.admin.nbcuni.com
Serial
2015121651
Refresh / retry
900 s / 1800 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
a1-196.akam.net (193.108.91.196)2015121651
a1-196.akam.net (2600:1401:2::c4)2015121651
a13-66.akam.net (2.22.230.66)2015121651
a13-66.akam.net (2600:1480:800::42)2015121651
a16-65.akam.net (23.211.132.65)2015121651
a16-65.akam.net (2600:1406:1b::41)2015121651
a2-64.akam.net (95.100.174.64)2015121651
a2-64.akam.net (2600:1480:7000::40)2015121651
a22-64.akam.net (23.211.61.64)2015121651
a22-64.akam.net (2600:1480:7800::40)2015121651
a7-66.akam.net (23.61.199.66)2015121651
a7-66.akam.net (2600:1406:32::42)2015121651

Checks

  • ✓ Serial 2015121651 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 15m is outside 20m–1d; retry 30m should be shorter than refresh 15m. Current values: refresh 15m, retry 30m, expire 7d, negative TTL 5m.
    #23
  • i
    Hidden master
    The primary nameserver ns1.nbcuni.com is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact domain.admin@nbcuni.com #25
    The SOA RNAME domain\.admin.nbcuni.com means domain.admin@nbcuni.com.
  • ✓ Date-based serial #26
    The serial 2015121651 follows the YYYYMMDDnn convention (2015-12-16).

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

29 records at the apex

Found

Read from
193.108.91.196:53
TypeValueTTL
SOAns1.nbcuni.com. domain\.admin.nbcuni.com. 2015121651 900 1800 604800 30043200
NSa1-196.akam.net.99
NSa2-64.akam.net.99
NSa7-66.akam.net.99
NSa13-66.akam.net.99
NSa22-64.akam.net.99
NSa16-65.akam.net.99
A2.19.198.147300
A2.19.198.153300
MX20 mx0b-00176a04.pphosted.com.43200
MX10 mxa-00176a04.gslb.pphosted.com.43200
MX20 mx0a-00176a04.pphosted.com.43200
MX10 mxb-00176a04.gslb.pphosted.com.43200
TXT"_z3odyixzmzrqpj9dpt4iaa531wybjt9"99
TXT"adobe-idp-site-verification=d266b426130588069c9d5b76db345b36532058a66f36380fe98526fe9bcd1502"99
TXT"google-site-verification=2HGzrNBjTm0TMAyT8psrvan75ZAlVTk7w6b32zTfyZA"99
TXT"v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com ~all"99
TXT"google-site-verification=xykurxD47PJxoK-w3FIi0n-0X5VfqO23pOjqVSKZLh0"99
TXT"v=DMARC1; p=none; fo=1; rua=mailto:nbcdmarc@leanplum.com;ruf=mailto:nbcdmarc@leanplum.com"99
TXT"google-site-verification=g-qMWSt-zMMBUvOnxoKpZMYB3jGYvjhM3yB8Y8S3bSI"99
TXT"atlassian-domain-verification=hnOZC9WrGJKmk3t83oojZWEloANSWU2MnvQDVGqe6laUY0fpn5KKgGOPrcZ0ufQY"99
TXT"_ndyg416yahogevwlm0ic5nygguvju1k"99
TXT"MS=ms45776050"99
TXT"google-site-verification=gPUHl1w8jD2X6YgbA_ddBcWeX7HGX0jFoh1c63dyxw0\010"99
TXT"apple-domain-verification=9QkhxNWX7RdCNXHH"99
TXT"_ph7ux6uatax9apr4mbaxgk5yas5a5wl"99
TXT"_0hvq3mj8ey9btfivongdsjg6w3h8c2o"99
TXT"amazonses:nrQBHklCs2OPiiTmnS3ISGeWKvTa4/zdzxdbRZYbFWY="99
TXT"google-site-verification=7cupNx2PaD4wrzsatdYeSL5i_h9_ZFrSYg7QXn_F0kM"99

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: NS (1m39s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1m39s; resolvers may use either.
    #32
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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