nbcboston.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 2026-12-06

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
6 December 2005
Last changed
4 November 2024
Expires
6 December 2026
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
a1-173.akam.net, a2-66.akam.net, a20-67.akam.net, a28-64.akam.net, a3-65.akam.net, a5-66.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 2026-12-06 #3
    The registration is valid until 2026-12-06 (44 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

a1-173.akam.net, a2-66.akam.net, a20-67.akam.net, a28-64.akam.net, a3-65.akam.net, a5-66.akam.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
a1-173.akam.net, a2-66.akam.net, a20-67.akam.net, a28-64.akam.net, a3-65.akam.net, a5-66.akam.net
NS in the zone
a1-173.akam.net, a2-66.akam.net, a20-67.akam.net, a28-64.akam.net, a3-65.akam.net, a5-66.akam.net
NameserverAddressesNetwork (AS)Glue
a1-173.akam.net193.108.91.173 2600:1401:2::adAS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a2-66.akam.net95.100.174.66 2600:1480:7000::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a20-67.akam.net95.100.175.67 2a02:26f0:67::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a28-64.akam.net95.100.173.64 2600:1480:d800::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a3-65.akam.net96.7.49.65 2600:1408:1c::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a5-66.akam.net95.100.168.66 2600:1480:b000::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-173.akam.net, a2-66.akam.net, a20-67.akam.net, a28-64.akam.net, a3-65.akam.net, a5-66.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.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 12 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 .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
a1-173.akam.net 193.108.91.173NOERROR, 3 ms, authoritativenoyes / yesrefused41824.9
a1-173.akam.net 2600:1401:2::adNOERROR, 4 ms, authoritativenoyes / yesrefused41824.7
a2-66.akam.net 95.100.174.66NOERROR, 4 ms, authoritativenoyes / yesrefused48878.33
a2-66.akam.net 2600:1480:7000::42NOERROR, 4 ms, authoritativenoyes / yesrefused48878.29
a20-67.akam.net 95.100.175.67NOERROR, 3 ms, authoritativenoyes / yesrefused48878.30
a20-67.akam.net 2a02:26f0:67::43NOERROR, 8 ms, authoritativenoyes / yesrefused48878.32
a28-64.akam.net 95.100.173.64NOERROR, 3 ms, authoritativenoyes / yesrefused48878.29
a28-64.akam.net 2600:1480:d800::40NOERROR, 4 ms, authoritativenoyes / yesrefused48878.33
a3-65.akam.net 96.7.49.65NOERROR, 3 ms, authoritativenoyes / yesrefused41824.10
a3-65.akam.net 2600:1408:1c::41NOERROR, 4 ms, authoritativenoyes / yesrefused41824.11
a5-66.akam.net 95.100.168.66NOERROR, 3 ms, authoritativenoyes / yesrefused41824.6
a5-66.akam.net 2600:1480:b000::42NOERROR, 4 ms, authoritativenoyes / yesrefused41824.7

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: a1-173.akam.net: "41824.9"; a1-173.akam.net: "41824.7"; a2-66.akam.net: "48878.33"; a2-66.akam.net: "48878.29"; a20-67.akam.net: "48878.30"; a20-67.akam.net: "48878.32"; a28-64.akam.net: "48878.29"; a28-64.akam.net: "48878.33"; a3-65.akam.net: "41824.10"; a3-65.akam.net: "41824.11"; a5-66.akam.net: "41824.6"; a5-66.akam.net: "41824.7". 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 2013021489 · primary ns1.nbcuni.com

Found

Primary (MNAME)
ns1.nbcuni.com
Contact (RNAME)
domain\.admin.nbcuni.com
Serial
2013021489
Refresh / retry
900 s / 3600 s
Expire
2592000 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
a1-173.akam.net (193.108.91.173)2013021489
a1-173.akam.net (2600:1401:2::ad)2013021489
a2-66.akam.net (95.100.174.66)2013021489
a2-66.akam.net (2600:1480:7000::42)2013021489
a20-67.akam.net (95.100.175.67)2013021489
a20-67.akam.net (2a02:26f0:67::43)2013021489
a28-64.akam.net (95.100.173.64)2013021489
a28-64.akam.net (2600:1480:d800::40)2013021489
a3-65.akam.net (96.7.49.65)2013021489
a3-65.akam.net (2600:1408:1c::41)2013021489
a5-66.akam.net (95.100.168.66)2013021489
a5-66.akam.net (2600:1480:b000::42)2013021489

Checks

  • ✓ Serial 2013021489 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 15m is outside 20m–1d; retry 1h should be shorter than refresh 15m. Current values: refresh 15m, retry 1h, expire 30d, negative TTL 15m.
    #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 2013021489 follows the YYYYMMDDnn convention (2013-02-14).

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

15 records at the apex

Found

Read from
193.108.91.173:53
TypeValueTTL
SOAns1.nbcuni.com. domain\.admin.nbcuni.com. 2013021489 900 3600 2592000 90043200
NSa20-67.akam.net.99
NSa2-66.akam.net.99
NSa3-65.akam.net.99
NSa5-66.akam.net.99
NSa1-173.akam.net.99
NSa28-64.akam.net.99
A104.101.238.2320
MX20 mx0a-00176a04.pphosted.com.99
MX10 mxb-00176a04.gslb.pphosted.com.99
MX20 mx0b-00176a04.pphosted.com.99
MX10 mxa-00176a04.gslb.pphosted.com.99
TXT"v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com ~all"99
TXT"_36eqj5khj6b6dp53ns2q2fwapguq9hr"99
TXT"MS=ms50604864"99

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (20s), MX (1m39s), 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.
  • ✓ 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