uphe.com

Checked 22 October 2026, 11:15 UTC · via 8.8.8.8
!Passed with warnings
23 passed 3 warnings 0 failed 5 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-02-26

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
26 February 2004
Last changed
25 January 2025
Expires
26 February 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
ns1.nbcuni.com, ns2.nbcuni.com, ns3.nbcuni.com, ns4.nbcuni.com, ns5.nbcuni.com, ns6.nbcuni.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 2027-02-26 #3
    The registration is valid until 2027-02-26 (127 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

warn

ns1.nbcuni.com, ns2.nbcuni.com, ns3.nbcuni.com, ns4.nbcuni.com, ns5.nbcuni.com, ns6.nbcuni.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.nbcuni.com, ns2.nbcuni.com, ns3.nbcuni.com, ns4.nbcuni.com, ns5.nbcuni.com, ns6.nbcuni.com
NS in the zone
ns1.nbcuni.com, ns2.nbcuni.com, ns3.nbcuni.com, ns4.nbcuni.com, ns5.nbcuni.com, ns6.nbcuni.com
NameserverAddressesNetwork (AS)Glue
ns1.nbcuni.com156.154.64.31 2001:502:f3ff::31AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US156.154.64.31
ns2.nbcuni.com156.154.65.31 2610:a1:1014::31AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US156.154.65.31
ns3.nbcuni.com156.154.66.31 2610:a1:1015::31AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US156.154.66.31
ns4.nbcuni.com156.154.67.31 2001:502:4612::31AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US156.154.67.31
ns5.nbcuni.com156.154.68.31 2610:a1:1016::31AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US156.154.68.31
ns6.nbcuni.com156.154.69.31 2610:a1:1017::31AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US156.154.69.31

Checks

  • ✓ 6 nameservers #6
    Delegated to ns1.nbcuni.com, ns2.nbcuni.com, ns3.nbcuni.com, ns4.nbcuni.com, ns5.nbcuni.com, ns6.nbcuni.com.
  • ✓ 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: ns1.nbcuni.com (glue 156.154.64.31, zone 156.154.64.31, 2001:502:f3ff::31); ns2.nbcuni.com (glue 156.154.65.31, zone 156.154.65.31, 2610:a1:1014::31); ns3.nbcuni.com (glue 156.154.66.31, zone 156.154.66.31, 2610:a1:1015::31); ns4.nbcuni.com (glue 156.154.67.31, zone 156.154.67.31, 2001:502:4612::31); ns5.nbcuni.com (glue 156.154.68.31, zone 156.154.68.31, 2610:a1:1016::31); ns6.nbcuni.com (glue 156.154.69.31, zone 156.154.69.31, 2610:a1:1017::31). 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 6 IPv4 /24s and 6 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS12008 (VERCARA - Vercara, LLC, US): 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 .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

info

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.nbcuni.com 156.154.64.31NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
ns1.nbcuni.com 2001:502:f3ff::31NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
ns2.nbcuni.com 156.154.65.31NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
ns2.nbcuni.com 2610:a1:1014::31NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
ns3.nbcuni.com 156.154.66.31NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
ns3.nbcuni.com 2610:a1:1015::31NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
ns4.nbcuni.com 156.154.67.31NOERROR, 31 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
ns4.nbcuni.com 2001:502:4612::31NOERROR, 32 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
ns5.nbcuni.com 156.154.68.31NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
ns5.nbcuni.com 2610:a1:1016::31NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
ns6.nbcuni.com 156.154.69.31NOERROR, 13 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
ns6.nbcuni.com 2610:a1:1017::31NOERROR, 13 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: ns1.nbcuni.com: "UltraDNS Nameserver"; ns2.nbcuni.com: "UltraDNS Nameserver"; ns3.nbcuni.com: "UltraDNS Nameserver"; ns4.nbcuni.com: "UltraDNS Nameserver"; ns5.nbcuni.com: "UltraDNS Nameserver"; ns6.nbcuni.com: "UltraDNS Nameserver".
    #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

pass

serial 2015032668 · primary ns1.nbcuni.com

Found

Primary (MNAME)
ns1.nbcuni.com
Contact (RNAME)
domain\.admin.nbcuni.com
Serial
2015032668
Refresh / retry
5400 s / 1800 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns1.nbcuni.com (156.154.64.31)2015032668
ns1.nbcuni.com (2001:502:f3ff::31)2015032668
ns2.nbcuni.com (156.154.65.31)2015032668
ns2.nbcuni.com (2610:a1:1014::31)2015032668
ns3.nbcuni.com (156.154.66.31)2015032668
ns3.nbcuni.com (2610:a1:1015::31)2015032668
ns4.nbcuni.com (156.154.67.31)2015032668
ns4.nbcuni.com (2001:502:4612::31)2015032668
ns5.nbcuni.com (156.154.68.31)2015032668
ns5.nbcuni.com (2610:a1:1016::31)2015032668
ns6.nbcuni.com (156.154.69.31)2015032668
ns6.nbcuni.com (2610:a1:1017::31)2015032668

Checks

  • ✓ Serial 2015032668 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 90m, retry 30m, expire 7d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.nbcuni.com is one of the listed nameservers.
  • ✓ Contact domain.admin@nbcuni.com #25
    The SOA RNAME domain\.admin.nbcuni.com means domain.admin@nbcuni.com.
  • ✓ Date-based serial #26
    The serial 2015032668 follows the YYYYMMDDnn convention (2015-03-26).

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

12 records at the apex

Found

Read from
156.154.64.31:53
TypeValueTTL
SOAns1.nbcuni.com. domain\.admin.nbcuni.com. 2015032668 5400 1800 604800 30043200
NSns1.nbcuni.com.99
NSns2.nbcuni.com.99
NSns3.nbcuni.com.99
NSns4.nbcuni.com.99
NSns5.nbcuni.com.99
NSns6.nbcuni.com.99
A104.17.182.799
A104.17.181.799
TXT"_krq12lzj8yajg3ypm5ohx6wf8nw9ote"99
TXT"_pk7vu06puxc8u8dsxoql86axvny1l4l"99
TXT"amazonses:GqRghZsJxTy+o57p/JE3iwkXw6S5ngUiHV+MuEg6A/s="99

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (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