northropgrumman.com

Checked 22 October 2026, 10:03 UTC · via 8.8.8.8
!Passed with warnings
24 passed 2 warnings 0 failed 5 info

Registration

info

.com generic · CSC Corporate Domains, Inc. · expires 2026-11-30

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSC Corporate Domains, Inc.
Registered
30 November 1999
Last changed
26 November 2024
Expires
30 November 2026
Status
client transfer prohibited
Registry nameservers
dnsdal.northgrum.com, po.northgrum.com, sundown.northgrum.com, sunrise.northgrum.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 2026-11-30 #3
    The registration is valid until 2026-11-30 (39 days).
  • ✓ Transfer locked #4
    Registry status: client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

warn

dnsdal.northgrum.com, po.northgrum.com, sundown.northgrum.com, sunrise.northgrum.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
dnsdal.northgrum.com, po.northgrum.com, sundown.northgrum.com, sunrise.northgrum.com
NS in the zone
dnsdal.northgrum.com, po.northgrum.com, sundown.northgrum.com, sunrise.northgrum.com
NameserverAddressesNetwork (AS)Glue
dnsdal.northgrum.com134.223.120.74AS1906 NORTHROP-GRUMMAN - Northrop Grumman, US134.223.120.74
po.northgrum.com157.127.124.219AS1906 NORTHROP-GRUMMAN - Northrop Grumman, US157.127.124.219
sundown.northgrum.com157.127.124.203AS1906 NORTHROP-GRUMMAN - Northrop Grumman, US157.127.124.203
sunrise.northgrum.com134.223.232.74AS1906 NORTHROP-GRUMMAN - Northrop Grumman, US134.223.232.74

Checks

  • ✓ 4 nameservers #6
    Delegated to dnsdal.northgrum.com, po.northgrum.com, sundown.northgrum.com, sunrise.northgrum.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 3 IPv4 /24s and 0 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS1906 (NORTHROP-GRUMMAN - Northrop Grumman, US): 4 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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

pass

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dnsdal.northgrum.com 134.223.120.74NOERROR, 106 ms, authoritativenoyes / yesrefused-
po.northgrum.com 157.127.124.219NOERROR, 170 ms, authoritativenoyes / yesrefused-
sundown.northgrum.com 157.127.124.203NOERROR, 170 ms, authoritativenoyes / yesrefused-
sunrise.northgrum.com 134.223.232.74NOERROR, 119 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 4 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

info

serial 2012022094 · primary ngdnsw.northgrum.com

Found

Primary (MNAME)
ngdnsw.northgrum.com
Contact (RNAME)
ng-dns-admin.ngc.com
Serial
2012022094
Refresh / retry
3600 s / 1800 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
dnsdal.northgrum.com (134.223.120.74)2012022094
po.northgrum.com (157.127.124.219)2012022094
sundown.northgrum.com (157.127.124.203)2012022094
sunrise.northgrum.com (134.223.232.74)2012022094

Checks

  • ✓ Serial 2012022094 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 30m, expire 7d, negative TTL 5m.
  • i
    Hidden master
    The primary nameserver ngdnsw.northgrum.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 ng-dns-admin@ngc.com #25
    The SOA RNAME ng-dns-admin.ngc.com means ng-dns-admin@ngc.com.
  • ✓ Date-based serial #26
    The serial 2012022094 follows the YYYYMMDDnn convention (2012-02-20).

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

info

13 records at the apex

Found

Read from
134.223.120.74:53
TypeValueTTL
SOAngdnsw.northgrum.com. ng-dns-admin.ngc.com. 2012022094 3600 1800 604800 3003600
NSsundown.northgrum.com.3600
NSpo.northgrum.com.3600
NSdnsdal.northgrum.com.3600
NSsunrise.northgrum.com.3600
A76.76.21.213600
TXT"ikr04kgu2apn5hamjkvp8a4j7b"3600
TXT"rss4oi82ogupmg31jdmn6q9m7f"3600
TXT"google-site-verification=gFInby-v6r1fGSC82Wv-1BQ5lIqjDufSyDpFrK1FoCM"3600
TXT"_hcfzqju9uw1jjegoypo4gqgacx1ap43"3600
TXT"google-site-verification=Pc4z-hYGv9UcRV98AK_69MLxw_fx_S2PLdJpbTt_ZoU"3600
TXT"nt6snkcn3374u225f2acu3tmhg"3600
TXT"google-site-verification=KE9SyZK7R1iD02C8k1AGxDk6MJTgfNTWtZvEx883pI4"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, NS 1h. The NS TTL at the parent is 2d and in the zone 1h; resolvers may use either.
  • ✓ 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