nielsen.com

Checked 22 October 2026, 10:03 UTC · via 8.8.8.8
!Passed with warnings
23 passed 2 warnings 0 failed 6 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-05-09

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
8 May 1991
Last changed
7 April 2026
Expires
9 May 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
udns1.ultradns.net, udns2.ultradns.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 2027-05-09 #3
    The registration is valid until 2027-05-09 (198 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

udns1.ultradns.net, udns2.ultradns.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
udns1.ultradns.net, udns2.ultradns.net
NS in the zone
pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk
NameserverAddressesNetwork (AS)Glue
pdns1.ultradns.net (zone only)204.74.108.1 2001:502:f3ff::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns2.ultradns.net (zone only)204.74.109.1 2610:a1:1014::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns3.ultradns.org (zone only)199.7.68.1 2610:a1:1015::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns4.ultradns.org (zone only)199.7.69.1 2001:502:4612::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns5.ultradns.info (zone only)204.74.114.1 2610:a1:1016::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns6.ultradns.co.uk (zone only)204.74.115.1 2610:a1:1017::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
udns1.ultradns.net (parent only)204.69.234.1 2001:502:f3ff::dAS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
udns2.ultradns.net (parent only)204.74.101.1 2610:a1:1014::dAS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: udns1.ultradns.net, udns2.ultradns.net.
    #6
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only at the parent: udns1.ultradns.net, udns2.ultradns.net; only in the zone: pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk. pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk, udns1.ultradns.net, udns2.ultradns.net report NS pdns1.ultradns.net pdns2.ultradns.net pdns3.ultradns.org pdns4.ultradns.org pdns5.ultradns.info pdns6.ultradns.co.uk.
    #7
  • ✓ 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 8 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): 16 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

info

16 of 16 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
pdns1.ultradns.net 204.74.108.1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns1.ultradns.net 2001:502:f3ff::1NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns2.ultradns.net 204.74.109.1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns2.ultradns.net 2610:a1:1014::1NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns3.ultradns.org 199.7.68.1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns3.ultradns.org 2610:a1:1015::1NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns4.ultradns.org 199.7.69.1NOERROR, 32 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns4.ultradns.org 2001:502:4612::1NOERROR, 32 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns5.ultradns.info 204.74.114.1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns5.ultradns.info 2610:a1:1016::1NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns6.ultradns.co.uk 204.74.115.1NOERROR, 13 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns6.ultradns.co.uk 2610:a1:1017::1NOERROR, 13 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
udns1.ultradns.net 204.69.234.1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
udns1.ultradns.net 2001:502:f3ff::dNOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
udns2.ultradns.net 204.74.101.1NOERROR, 31 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
udns2.ultradns.net 2610:a1:1014::dNOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver

Checks

  • ✓ All respond #14
    All 16 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: pdns1.ultradns.net: "UltraDNS Nameserver"; pdns2.ultradns.net: "UltraDNS Nameserver"; pdns3.ultradns.org: "UltraDNS Nameserver"; pdns4.ultradns.org: "UltraDNS Nameserver"; pdns5.ultradns.info: "UltraDNS Nameserver"; pdns6.ultradns.co.uk: "UltraDNS Nameserver"; udns1.ultradns.net: "UltraDNS Nameserver"; udns2.ultradns.net: "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 2017070371 · primary pdns1.ultradns.net

Found

Primary (MNAME)
pdns1.ultradns.net
Contact (RNAME)
dnsadmin.nielsen.com
Serial
2017070371
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
43200 s

Serial per nameserver

NameserverSerial
pdns1.ultradns.net (204.74.108.1)2017070371
pdns1.ultradns.net (2001:502:f3ff::1)2017070371
pdns2.ultradns.net (204.74.109.1)2017070371
pdns2.ultradns.net (2610:a1:1014::1)2017070371
pdns3.ultradns.org (199.7.68.1)2017070371
pdns3.ultradns.org (2610:a1:1015::1)2017070371
pdns4.ultradns.org (199.7.69.1)2017070371
pdns4.ultradns.org (2001:502:4612::1)2017070371
pdns5.ultradns.info (204.74.114.1)2017070371
pdns5.ultradns.info (2610:a1:1016::1)2017070371
pdns6.ultradns.co.uk (204.74.115.1)2017070371
pdns6.ultradns.co.uk (2610:a1:1017::1)2017070371
udns1.ultradns.net (204.69.234.1)2017070371
udns1.ultradns.net (2001:502:f3ff::d)2017070371
udns2.ultradns.net (204.74.101.1)2017070371
udns2.ultradns.net (2610:a1:1014::d)2017070371

Checks

  • ✓ Serial 2017070371 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 12h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver pdns1.ultradns.net is one of the listed nameservers.
  • ✓ Contact dnsadmin@nielsen.com #25
    The SOA RNAME dnsadmin.nielsen.com means dnsadmin@nielsen.com.
  • ✓ Date-based serial #26
    The serial 2017070371 follows the YYYYMMDDnn convention (2017-07-03).

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

57 records at the apex

Found

Read from
204.74.108.1:53
TypeValueTTL
SOApdns1.ultradns.net. dnsadmin.nielsen.com. 2017070371 10800 3600 604800 432003600
NSpdns1.ultradns.net.86400
NSpdns2.ultradns.net.86400
NSpdns3.ultradns.org.86400
NSpdns4.ultradns.org.86400
NSpdns5.ultradns.info.86400
NSpdns6.ultradns.co.uk.86400
A192.0.66.96300
MX1 aspmx.l.google.com.3600
MX5 alt1.aspmx.l.google.com.3600
MX5 alt2.aspmx.l.google.com.3600
MX10 alt3.aspmx.l.google.com.3600
MX10 alt4.aspmx.l.google.com.3600
TXT"spf2.0/pra"600
TXT"MS=ms41051260"600
TXT"MS=ms67552876"600
TXT"_ai81x2u5stppdkyre8n0ezt5ky1t4lt"600
TXT"v=spf1 redirect=nielsenmedia.com"600
TXT"78bbee88-ff35-4ebd-a89c-c171623a2556"600
TXT"asv=bf2e463d186d760daa4dac04f2189363"600
TXT"chariot=chariot+nielsen@praetorian.com"600
TXT"apple-domain-verification=JTibV8tKhqrsFjn5"600
TXT"69fddfc11326d61913ff947e.hoxhuntsigning.com"600
TXT"S++U9DTmPuWS35PmOtd+b9EGXReFRPlH3OCLbosxcd4="600
TXT"docusign=c34c43dd-9b32-43cc-8e1a-927cec32c6ed"600
TXT"docusign=eff616df-1c79-4f17-a483-41df197156e0"600
TXT"vertexinc-cloud-f4e45a1f-b0d6-43db-b9fc-4ce6f7304034"600
TXT"amazonses:0JosrlclByQF0TUsPNy0SQef9qg/hdQRAXwkGMEKxUA="600
TXT"amazonses:EDDacT4UsDG+Qc+FRfYpNNvEOQzeaShKQUSi8K7tNAU="600
TXT"amazonses:PGjwQCzzs3Wm+ONWo5DNcDbTKPBaomU4C+g+w8bQ0Cc="600
TXT"amazonses:RU3KDh1Q6flY8zP+pA0WOA8kuCaXCFdSoNIdQBySLYQ="600
TXT"amazonses:prkq66HtyEY2olarwkuQTxOKmVpexTvKSKZD0nTrZsw="600
TXT"amazonses:CMjF0nhMIlOStaYBRZZf+5dETxEYbvqkyw6bo3tG62U= "600
TXT"miro-verification=bd31f86ea27054eddbcf39ef767cce5163f1d7dd"600
TXT"cursor-domain-verification-nrtyzf=yn7HXR3200uZTbCpwUOh2WpNk"600
TXT"facebook-domain-verification=sl8du0ke9guurybwg45jxj8i479ev7"600
TXT"kiro-site-verification=c87b62bd-d1a9-4fbb-87c4-467cd5e5c10d"600
TXT"smartsheet-site-validation=vFfZpWmTE4YfhFSxtnG5j3_p_hu4k_xO"600
TXT"workplace-domain-verification=UFAkrwf7ECD95XHT8EBiP1aQoYsZPu"600
TXT"onetrust-domain-verification=8c659e5cd0434b48af1ee2a02d71471c"600
TXT"anthropic-domain-verification-xea344=7JYUkKzKsua4Uwb8UBXKT88Vu"600
TXT"vmware-cloud-verification-e7e740f3-1587-48ca-a362-dfb52b02dab2"600
TXT"google-site-verification=bxXOriWggTqH_8xPx5gPdOwac9leSuqcQludAHOxJE0"600
TXT"liveramp-site-verification=ACjlvkmxMUhaIkPSnxfs-XEfK7bUAz0a9NGGrnYjGfo"600
TXT"_globalsign-domain-verification=VvDpOdxqrg1tm5Pqkg2JSk9H5WqnI_O1VYhH7wUif6"600
TXT"_globalsign-domain-verification=uqDQCq1dOLC9lyzN68Grz66P1qpMXrUgu-Q111CVVw"600
TXT"atlassian-sending-domain-verification=8c150d6d-0537-4aaf-80e9-a9dd8ca01648"600
TXT"pardot31782=b80a14ec11c49bb8307f78a6de296a7fd52bf73edbe8b1148c699eba6d6fc88e "600
TXT"pardot407042=326c335e144c4c389b1fd392bfce3fe651f86670057bbce87a5cbba848477c5a"600
TXT"pardot881703=bda145131aa75cc8b4ffbcd3a03b6030184b13efe5c428318ae54a4fd575a548"600
TXT"pardot_85462_*=3d08aa457edc0a6d5f8402a9f27e97be967bd899ec40de3ef5517a10c3a7bad0"600
TXT"Dynatrace-site-verification=e8499418-763b-4e07-a2a9-630887963898__2lre76d6k2cspk5nbhcab5vkm0"600
TXT"adobe-idp-site-verification=d4250894cee614bbe020fa949280b0ad410c6b2930ba4383f4652a135544f587"600
TXT"cisco-ci-domain-verification=4cb7d8a43966e27101c7b4a6f465153af246a51d22896fb10771c0f7bf0480a"600
TXT"cisco-ci-domain-verification=6942166472e691ef8e55cb4759b596597527a28b064e4fc259257026c4f601be"600
TXT"atlassian-domain-verification=sTb4hFWtIi5V/G7/I/PG5eYIA95YUMrC+ucuxckH99NzjiBo/5kYo94NeHCG+Rgy"600
TXT"wrike-verification=Mjk1ODE5OTpkM2Y4Y2NmZDY3YTI5YWQ3ZGExMjJhNmRmNjRlYjBjMWI1YmQ3YWFiMzUzMDhlNjQ4ZDcwZDAxODNiMDU0NGIx"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 1h, NS 1d. The NS TTL at the parent is 2d and in the zone 1d; 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