tesco.com

Checked 22 October 2026, 11:01 UTC · via 8.8.8.8
!Passed with warnings
26 passed 2 warnings 0 failed 3 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-12-19

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
20 December 1994
Last changed
17 November 2025
Expires
19 December 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
ns12.ultradns2.com, ns12.ultradns2.org, pdns194.ultradns.biz, pdns194.ultradns.co.uk, pdns194.ultradns.com, pdns194.ultradns.info, pdns194.ultradns.net, pdns194.ultradns.org
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 2027-12-19 #3
    The registration is valid until 2027-12-19 (422 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

pass

ns12.ultradns2.com, ns12.ultradns2.org, pdns194.ultradns.biz, pdns194.ultradns.co.uk, pdns194.ultradns.com, pdns194.ultradns.info, pdns194.ultradns.net, pdns194.ultradns.org

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns12.ultradns2.com, ns12.ultradns2.org, pdns194.ultradns.biz, pdns194.ultradns.co.uk, pdns194.ultradns.com, pdns194.ultradns.info, pdns194.ultradns.net, pdns194.ultradns.org
NS in the zone
ns12.ultradns2.com, ns12.ultradns2.org, pdns194.ultradns.biz, pdns194.ultradns.co.uk, pdns194.ultradns.com, pdns194.ultradns.info, pdns194.ultradns.net, pdns194.ultradns.org
NameserverAddressesNetwork (AS)Glue
ns12.ultradns2.com204.74.104.12 2610:a1:310c::53AS399153 SECURITYSERVICES - Vercara, LLC, US AS399155 SECURITYSERVICES - Vercara, LLC, US204.74.104.12 2610:a1:310c::53
ns12.ultradns2.org204.74.106.12 2610:a1:320c::53AS399154 SECURITYSERVICES - Vercara, LLC, US AS399154 SECURITYSERVICES - Vercara, LLC, US-
pdns194.ultradns.biz156.154.66.194 2610:a1:1015::e6AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns194.ultradns.co.uk156.154.69.194 2610:a1:1017::e6AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns194.ultradns.com156.154.64.194 2001:502:f3ff::e6AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US156.154.64.194 2001:502:f3ff::e6
pdns194.ultradns.info156.154.68.194 2610:a1:1016::e6AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns194.ultradns.net156.154.65.194 2610:a1:1014::e6AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns194.ultradns.org156.154.67.194 2001:502:4612::e6AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-

Checks

  • ✓ 8 nameservers #6
    Delegated to ns12.ultradns2.com, ns12.ultradns2.org, pdns194.ultradns.biz, pdns194.ultradns.co.uk, pdns194.ultradns.com, pdns194.ultradns.info, pdns194.ultradns.net, pdns194.ultradns.org.
  • ✓ 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 8 IPv4 /24s and 8 IPv6 /48s.
  • ✓ 4 autonomous systems #11
    The nameservers are spread over: AS12008 (VERCARA - Vercara, LLC, US): 12 addresses; AS399153 (SECURITYSERVICES - Vercara, LLC, US): 1 address; AS399154 (SECURITYSERVICES - Vercara, LLC, US): 2 addresses; AS399155 (SECURITYSERVICES - Vercara, LLC, US): 1 address.
  • ✓ Nameserver names under 6 TLDs #12
    Nameserver names use the TLDs .biz, .com, .info, .net, .org, .uk.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

16 of 16 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns12.ultradns2.com 204.74.104.12NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
ns12.ultradns2.com 2610:a1:310c::53NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
ns12.ultradns2.org 204.74.106.12NOERROR, 10 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
ns12.ultradns2.org 2610:a1:320c::53NOERROR, 10 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns194.ultradns.biz 156.154.66.194NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns194.ultradns.biz 2610:a1:1015::e6NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns194.ultradns.co.uk 156.154.69.194NOERROR, 31 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns194.ultradns.co.uk 2610:a1:1017::e6NOERROR, 32 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns194.ultradns.com 156.154.64.194NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns194.ultradns.com 2001:502:f3ff::e6NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns194.ultradns.info 156.154.68.194NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns194.ultradns.info 2610:a1:1016::e6NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns194.ultradns.net 156.154.65.194NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns194.ultradns.net 2610:a1:1014::e6NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns194.ultradns.org 156.154.67.194NOERROR, 31 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns194.ultradns.org 2001:502:4612::e6NOERROR, 32 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: ns12.ultradns2.com: "UltraDNS Nameserver"; ns12.ultradns2.org: "UltraDNS Nameserver"; pdns194.ultradns.biz: "UltraDNS Nameserver"; pdns194.ultradns.co.uk: "UltraDNS Nameserver"; pdns194.ultradns.com: "UltraDNS Nameserver"; pdns194.ultradns.info: "UltraDNS Nameserver"; pdns194.ultradns.net: "UltraDNS Nameserver"; pdns194.ultradns.org: "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 2015040710 · primary pdns194.ultradns.com

Found

Primary (MNAME)
pdns194.ultradns.com
Contact (RNAME)
web\.admin.uk.tesco.com
Serial
2015040710
Refresh / retry
86400 s / 7200 s
Expire
2592000 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns12.ultradns2.com (204.74.104.12)2015040710
ns12.ultradns2.com (2610:a1:310c::53)2015040710
ns12.ultradns2.org (204.74.106.12)2015040710
ns12.ultradns2.org (2610:a1:320c::53)2015040710
pdns194.ultradns.biz (156.154.66.194)2015040710
pdns194.ultradns.biz (2610:a1:1015::e6)2015040710
pdns194.ultradns.co.uk (156.154.69.194)2015040710
pdns194.ultradns.co.uk (2610:a1:1017::e6)2015040710
pdns194.ultradns.com (156.154.64.194)2015040710
pdns194.ultradns.com (2001:502:f3ff::e6)2015040710
pdns194.ultradns.info (156.154.68.194)2015040710
pdns194.ultradns.info (2610:a1:1016::e6)2015040710
pdns194.ultradns.net (156.154.65.194)2015040710
pdns194.ultradns.net (2610:a1:1014::e6)2015040710
pdns194.ultradns.org (156.154.67.194)2015040710
pdns194.ultradns.org (2001:502:4612::e6)2015040710

Checks

  • ✓ Serial 2015040710 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 2h, expire 30d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver pdns194.ultradns.com is one of the listed nameservers.
  • ✓ Contact web.admin@uk.tesco.com #25
    The SOA RNAME web\.admin.uk.tesco.com means web.admin@uk.tesco.com.
  • ✓ Date-based serial #26
    The serial 2015040710 follows the YYYYMMDDnn convention (2015-04-07).

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

51 records at the apex

Found

Read from
204.74.104.12:53
TypeValueTTL
SOApdns194.ultradns.com. web\.admin.uk.tesco.com. 2015040710 86400 7200 2592000 360010800
NSns12.ultradns2.com.86400
NSns12.ultradns2.org.86400
NSpdns194.ultradns.co.uk.86400
NSpdns194.ultradns.biz.86400
NSpdns194.ultradns.com.86400
NSpdns194.ultradns.net.86400
NSpdns194.ultradns.org.86400
NSpdns194.ultradns.info.86400
A23.209.208.9620
MX10 mxa-00492d01.gslb.pphosted.com.3600
MX10 mxb-00492d01.gslb.pphosted.com.3600
TXT"MS=ms24275605"10800
TXT"as=1483625869"10800
TXT"dropbox-domain-verification=w1mhubbs2gc7"10800
TXT"apple-domain-verification=1RAiTIBCT1CEajPl"10800
TXT"apple-domain-verification=EvXHd5soJuVQA4rE"10800
TXT"flexera-domain-verification-vrfjpetxaqqpcsgu"10800
TXT"docusign=da84d3e5-a4b2-4bc9-b8b3-2e6da3819ae6"10800
TXT"jamf-site-verification=oIaJFfQu8J9131b-DZ6TMw"10800
TXT"mk-org-sso-279ddc44-6a99-4dda-8e0c-886a6686fb3c"10800
TXT"Sendinblue-code:18cfb832b593c632d3154efb0dd1fa72"10800
TXT"cloudhealth=183c4ce5-a2ab-406b-810b-3166ea263dd3"10800
TXT"airtable-verification=5e91d4a254cceafaefd5eed9da476063"10800
TXT"openai-domain-verification=dv-Jt9gnuB5UuRdGweaa3VcAQTX"10800
TXT"docker-verification=3a683349-c1ec-4d5d-b3a3-3dd2e245f03a"10800
TXT"miro-verification=3e91044951f4691c3416d8a619db9a65fbc39de7"10800
TXT"facebook-domain-verification=ts1bz0umbg7kb23hmsnorgh1031env"10800
TXT"twilio-domain-verification=2aa0cc9af8e9cc4457fc4fd3d8d5ecef"10800
TXT"onetrust-domain-verification=11e63679cda44b43a52e47eb5a34b38b"10800
TXT"uber-domain-verification=9084bbbc-b39b-4850-8eae-6d20bec63ab2"10800
TXT"1aa1833deddfa5747db8357a93d1fdaca155464f565bda4fba037a27fd2da6e1"10800
TXT"google-site-verification=2ugAZEJMI_mzfc8UEKG1o0J0KzGkHursQNXcwkbhV0I"10800
TXT"google-site-verification=C9ZloarVQZlDG6FPLYlSq2p090KR42merT70ezMHZ5I"10800
TXT"google-site-verification=DWJrXDJC4zmjCbaIqfXTtt5JORBxJTzpnqpUa3n0fx4"10800
TXT"google-site-verification=MjF6fnCVti1DI5PFF1z9dN9QV0-ublc4JOvGMcoggbc"10800
TXT"liveramp-site-verification=clkAdzlfst-Behbl7rVHXzuTHciA2SdFqLx4QCOCUdk"10800
TXT"h1-domain-verification=ARq7Fyh5Akdto2wW8aw9UWWaAbWE3W6Bk7mkZ2UHhwqZc1Ca"10800
TXT"h1-domain-verification=vwBLdcfNpeE7F1mC3EPJZFCQrMGbn5AXYWJxEwNirFczPTs7"10800
TXT"stripe-verification=03bf54a545ba5313be8191bbb2b8949e1cd79c0d89e4bf4d42fdce54001d3b5b"10800
TXT"stripe-verification=19a3dcababfe8bba26b29b92786b5040103b0c9f0fd0d7e3f48000ae3fa80fd1"10800
TXT"Kis9jvtphKubMl4kK6NF2LIB0z/b55ElGSqZgs69ZHr477wACPSbbgWWh4lhx+b/QMH3jJV8UbMEQdnVsZrynA=="10800
TXT"OfIrMdH47XzlBvnBb3zpLrzkvrcgq+KeYh1/3R5gf5cxxfY06+jUgtp8i37FxqwJeChiaUQZ+U3qEbuWY9LENw=="10800
TXT"yz+ynZicKBgIXFdF72Zy0imgDIjE0OPRcvSqnVfWPSb2zvFtvdVlfu1ooCseJ9rOv1o0orkqjfMoKE2NcXLcVg=="10800
TXT"sophos-domain-verification=0bc031a050735e1c2acff35cfc67d3bd175decd186e3a0011f46ecac555db0f1"10800
TXT"adobe-idp-site-verification=fa39eddb7c330d34becca72c5d37be0f0ffd355961e807376eb4438e46753faa"10800
TXT"atlassian-domain-verification=OAAOJVgn5dmEwQ0eI6wLtKPMqjC6hyZihf4qMCK4q2icVwEBMwgku+736RrBqlVx"10800
TXT"atlassian-domain-verification=gm04TPagsUhKmDWYp8o8qk8JIn15nNmkeu9TQEuvziMmPCf1jCuPpKEPVycvubtE"10800
TXT"atlassian-domain-verification=h4T7MohAGx3aZIzeQ7B5vyizURa6uvO3q6aO9RhBDn/zpi3rZhYOcrTHi8VYyEQ5"10800
TXT"figma-domain-verification=f57d4850f826114e335f1e4965fe3b35487b42c630aaf6a33af06a81d977f2cc-1767801983"10800
TXT"v=spf1 include:spf-00492d01.pphosted.com include:spf.protection.outlook.com include:mail.zendesk.com include:_spf.salesforce.com include:spf.sendinblue.com ip4:212.140.180.250 ip4:212.140.187.24 ip4:212.140.189.59 ip4:35.177.140.163 ip4:35.178.162.89 ip4:" "52.56.79.124 ip4:31.193.11.33 ip4:31.193.11.41 ip4:62.13.153.174 ip4:85.115.52.190 ip4:141.145.47.16/28 ip4:160.34.31.16/28 ip4:77.32.150.153 ip4:183.78.170.182 ip4:94.125.18.60/31 ip4:147.154.255.192/26 ip4:129.149.22.192/26 -all"10800

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (20s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1d; 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