t-mobile.com

Checked 22 October 2026, 10:54 UTC · via 8.8.8.8
!Passed with warnings
25 passed 3 warnings 0 failed 3 info

Registration

info

.com generic · Deutsche Telekom AG · expires 2027-01-13

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Deutsche Telekom AG
Registered
13 January 2000
Last changed
14 August 2026
Expires
13 January 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
a1-167.akam.net, a13-67.akam.net, a14-65.akam.net, a6-66.akam.net, a7-65.akam.net, a8-66.akam.net, auth1.dns.cogentco.com, auth2.dns.cogentco.com, ns10.zayo.com, ns20.zayo.com, ns3.level3.net, ns4.level3.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 2027-01-13 #3
    The registration is valid until 2027-01-13 (83 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

warn

a1-167.akam.net, a13-67.akam.net, a14-65.akam.net, a6-66.akam.net, a7-65.akam.net, a8-66.akam.net, auth1.dns.cogentco.com, auth2.dns.cogentco.com, ns10.zayo.com, ns20.zayo.com, ns3.level3.net, ns4.level3.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
a1-167.akam.net, a13-67.akam.net, a14-65.akam.net, a6-66.akam.net, a7-65.akam.net, a8-66.akam.net, auth1.dns.cogentco.com, auth2.dns.cogentco.com, ns10.zayo.com, ns20.zayo.com, ns3.level3.net, ns4.level3.net
NS in the zone
a1-167.akam.net, a13-67.akam.net, a14-65.akam.net, a6-66.akam.net, a7-65.akam.net, a8-66.akam.net, auth1.dns.cogentco.com, auth2.dns.cogentco.com, ns10.zayo.com, ns20.zayo.com, ns3.level3.net, ns4.level3.net
NameserverAddressesNetwork (AS)Glue
a1-167.akam.net193.108.91.167 2600:1401:2::a7AS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a13-67.akam.net2.22.230.67 2600:1480:800::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a14-65.akam.net184.26.161.65 2600:1480:1800::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a6-66.akam.net23.211.133.66 2600:1401:1::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a7-65.akam.net23.61.199.65 2600:1406:32::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a8-66.akam.net2.16.40.66 2600:1403:a::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
auth1.dns.cogentco.com66.28.0.14 2001:550:1:a::dAS174 COGENT-174 - Cogent Communications, LLC, US AS174 COGENT-174 - Cogent Communications, LLC, US2001:550:1:a::d 66.28.0.14
auth2.dns.cogentco.com66.28.0.30 2001:550:1:b::dAS174 COGENT-174 - Cogent Communications, LLC, US AS174 COGENT-174 - Cogent Communications, LLC, US66.28.0.30
ns10.zayo.com64.125.228.105AS6461 ZAYO-6461 - Zayo Bandwidth, US64.125.228.105
ns20.zayo.com64.125.226.44AS6461 ZAYO-6461 - Zayo Bandwidth, US64.125.226.44
ns3.level3.net216.136.95.12AS3549 LVLT-3549 - Level 3 Parent, LLC, US-
ns4.level3.net64.132.94.251AS3549 LVLT-3549 - Level 3 Parent, LLC, US-

Checks

  • ✓ 12 nameservers #6
    Delegated to a1-167.akam.net, a13-67.akam.net, a14-65.akam.net, a6-66.akam.net, a7-65.akam.net, a8-66.akam.net, auth1.dns.cogentco.com, auth2.dns.cogentco.com, ns10.zayo.com, ns20.zayo.com, ns3.level3.net, ns4.level3.net.
  • ✓ 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: auth2.dns.cogentco.com (glue 66.28.0.30, zone 66.28.0.30, 2001:550:1:b::d). 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 11 IPv4 /24s and 7 IPv6 /48s.
  • ✓ 5 autonomous systems #11
    The nameservers are spread over: AS174 (COGENT-174 - Cogent Communications, LLC, US): 4 addresses; AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL): 1 address; AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 11 addresses; AS3549 (LVLT-3549 - Level 3 Parent, LLC, US): 2 addresses; AS6461 (ZAYO-6461 - Zayo Bandwidth, US): 2 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .com, .net.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns10.zayo.com, ns20.zayo.com, ns3.level3.net, ns4.level3.net.
    #13

Nameservers

warn

20 of 20 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a1-167.akam.net 193.108.91.167NOERROR, 4 ms, authoritativenoyes / yesrefused41824.9
a1-167.akam.net 2600:1401:2::a7NOERROR, 5 ms, authoritativenoyes / yesrefused41824.9
a13-67.akam.net 2.22.230.67NOERROR, 4 ms, authoritativenoyes / yesrefused41824.8
a13-67.akam.net 2600:1480:800::43NOERROR, 5 ms, authoritativenoyes / yesrefused41824.9
a14-65.akam.net 184.26.161.65NOERROR, 4 ms, authoritativenoyes / yesrefused48878.26
a14-65.akam.net 2600:1480:1800::41NOERROR, 4 ms, authoritativenoyes / yesrefused48878.33
a6-66.akam.net 23.211.133.66NOERROR, 3 ms, authoritativenoyes / yesrefused48878.27
a6-66.akam.net 2600:1401:1::42NOERROR, 3 ms, authoritativenoyes / yesrefused48878.33
a7-65.akam.net 23.61.199.65NOERROR, 3 ms, authoritativenoyes / yesrefused41824.7
a7-65.akam.net 2600:1406:32::41NOERROR, 5 ms, authoritativenoyes / yesrefused41824.5
a8-66.akam.net 2.16.40.66NOERROR, 5 ms, authoritativenoyes / yesrefused48878.29
a8-66.akam.net 2600:1403:a::42NOERROR, 5 ms, authoritativenoyes / yesrefused48878.27
auth1.dns.cogentco.com 66.28.0.14NOERROR, 8 ms, authoritativenoyes / yesrefusedCogent_DNS
auth1.dns.cogentco.com 2001:550:1:a::dNOERROR, 9 ms, authoritativenoyes / yesrefusedCogent_DNS
auth2.dns.cogentco.com 66.28.0.30NOERROR, 8 ms, authoritativenoyes / yesrefusedCogent_DNS
auth2.dns.cogentco.com 2001:550:1:b::dNOERROR, 6 ms, authoritativenoyes / yesrefusedCogent_DNS
ns10.zayo.com 64.125.228.105NOERROR, 119 ms, authoritativenoyes / yesrefusedContact ipeng for info
ns20.zayo.com 64.125.226.44NOERROR, 89 ms, authoritativenoyes / yesrefusedContact ipeng for info
ns3.level3.net 216.136.95.12NOERROR, 114 ms, authoritativenoyes / yesrefusedhostmaster@Level3.net
ns4.level3.net 64.132.94.251NOERROR, 113 ms, authoritativenoyes / yesrefusedhostmaster@Level3.net

Checks

  • ✓ All respond #14
    All 20 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: a1-167.akam.net: "41824.9"; a13-67.akam.net: "41824.8"; a13-67.akam.net: "41824.9"; a14-65.akam.net: "48878.26"; a14-65.akam.net: "48878.33"; a6-66.akam.net: "48878.27"; a6-66.akam.net: "48878.33"; a7-65.akam.net: "41824.7"; a7-65.akam.net: "41824.5"; a8-66.akam.net: "48878.29"; a8-66.akam.net: "48878.27". 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

info

serial 3334558648 · primary anppol31.gsm1900.org

Found

Primary (MNAME)
anppol31.gsm1900.org
Contact (RNAME)
admin.t-mobile.com
Serial
3334558648
Refresh / retry
28800 s / 1800 s
Expire
3600000 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
a1-167.akam.net (193.108.91.167)3334558648
a1-167.akam.net (2600:1401:2::a7)3334558648
a13-67.akam.net (2.22.230.67)3334558648
a13-67.akam.net (2600:1480:800::43)3334558648
a14-65.akam.net (184.26.161.65)3334558648
a14-65.akam.net (2600:1480:1800::41)3334558648
a6-66.akam.net (23.211.133.66)3334558648
a6-66.akam.net (2600:1401:1::42)3334558648
a7-65.akam.net (23.61.199.65)3334558648
a7-65.akam.net (2600:1406:32::41)3334558648
a8-66.akam.net (2.16.40.66)3334558648
a8-66.akam.net (2600:1403:a::42)3334558648
auth1.dns.cogentco.com (66.28.0.14)3334558648
auth1.dns.cogentco.com (2001:550:1:a::d)3334558648
auth2.dns.cogentco.com (66.28.0.30)3334558648
auth2.dns.cogentco.com (2001:550:1:b::d)3334558648
ns10.zayo.com (64.125.228.105)3334558648
ns20.zayo.com (64.125.226.44)3334558648
ns3.level3.net (216.136.95.12)3334558648
ns4.level3.net (64.132.94.251)3334558648

Checks

  • ✓ Serial 3334558648 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 30m, expire 1000h, negative TTL 15m.
  • i
    Hidden master
    The primary nameserver anppol31.gsm1900.org 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 admin@t-mobile.com #25
    The SOA RNAME admin.t-mobile.com means admin@t-mobile.com.
  • ✓ Timestamp serial #26
    The serial 3334558648 is a Unix timestamp (2075-09-01 10:17 UTC).

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

pass

80 records at the apex

Found

Read from
193.108.91.167:53
TypeValueTTL
SOAanppol31.gsm1900.org. admin.t-mobile.com. 3334558648 28800 1800 3600000 900300
NSns10.zayo.com.300
NSns20.zayo.com.300
NSa6-66.akam.net.300
NSauth1.dns.cogentco.com.300
NSa1-167.akam.net.300
NSa14-65.akam.net.300
NSns3.level3.net.300
NSns4.level3.net.300
NSauth2.dns.cogentco.com.300
NSa8-66.akam.net.300
NSa7-65.akam.net.300
NSa13-67.akam.net.300
A23.205.249.201900
MX10 mxb-00025704.gslb.pphosted.com.300
MX10 mxa-00025704.gslb.pphosted.com.300
TXT"01319392"300
TXT"hubspot-developer-verification=MDRhYzQ2NDItMDEwNC00ZjcxLTlkZGUtMWNiMGMyM2Q1MGZh"300
TXT"infoblox-domain-mastery=74b051f293ffeddd50555c4bad7f26d3a10bb2747c6f4d9aa7d9227b34c738a586"300
TXT"pardot27512=104ea8a9b27d1b908d1ca3648bc2b1fc9a51868c7f4f5276afe19a184bfb2c67"300
TXT"mongodb-site-verification=vxzm0v32S5akF4SUYyztlilqyanHxhej"300
TXT"v=spf1 include:spf-00025703.pphosted.com include:spf.protection.outlook.com include:spf-00025704.pphosted.com include:spfa.t-mobile.com -all"300
TXT"safebreach-domain-verification=d13aaf5d-3e4b-42ef-ac10-2a4bc1845580"300
TXT"pardot373303=590bf6d3120d11c674d46ad11c2c001522ffdffd2ee119682dbef39c4e4d9645"300
TXT"globalsign-domain-verification=F43413DC69919612FB5BBC1331CFB888"300
TXT"globalsign-domain-verification=1ADE7E59F15B848208E9A2C3149BD6D9"300
TXT"mongodb-site-verification=yT8AEYHWWybrpK1eaOJcyv5dscaJO38p"300
TXT"flexera-domain-verification-ivzrauoydrpdpzck"300
TXT"mongodb-site-verification=VzaTCfxQ1u33iJ9f1oy8ZHRnaQg4aYsg"300
TXT"9BfPDaYMzkYvaklEhWuipbRJA+Q3iE2fQHsozZv8YnH2aXu/l1ySXimIQ5QAxdk1JptN6ZlP/9fOJs6mwbueDA=="300
TXT"pardot27512=f3f9d92bd48b12ce585e7a93122d4159d5f8078eaad156ec9e1e47f0b63deb02"300
TXT"flexera-domain-verification-assbcwanzajkzhoj"300
TXT"google-site-verification=vn8hAM-cJoTQ0JqFsa_AXedZYcx_UhFilSt35qzqgVU"300
TXT"status-page-domain-verification=f4p9pvjt5gtw"300
TXT"pardot970243=51ca5207b7299be32a3287b251542df7efc64e216785f8bb255296ccf4ae5406"300
TXT"apple-domain-verification=FyTXddvPXPs0FQlw"300
TXT"atlassian-domain-verification=9rtC63Zem2OXazHZo0JP5ut2fjvh4emaX/asaF85aZ25subk0l0wgs81SYf6acg3"300
TXT"mongodb-site-verification=kyVazFNkhRwf381tlknqe9Ta5cHSr17w"300
TXT"4df61529-85a8-43eb-9a1b-744a26fc0bfb"300
TXT"3oQetLbPYiIeB-AqjqjTDKzN8mw"300
TXT"UCOMDPAAJiCNuzP/ebVmFOKAA2TP7tqEvDM1cf4ItaeVqtwgGqZNEMG/8c0aEZSaWZlKHKQdZMt8bRufnNJJ8Q=="300
TXT"paloaltonetworks-site-verification=e19ce729d4e0b73b68eb1c514696827a414288c627589613ef779cb56d7bb3b1"300
TXT"google-site-verification=s5rWqvuHEodjhvw1kbSqZhYuHxluldo1wJEFOWzm37E"300
TXT"asv=4440ed722578d3216de4f9e103861c6f"300
TXT"ijJn37K8VdSxayA18QtfR1qUev8VV9Ju45iyxMtMgfH0BxW0JsckR6o17BKB++/izjsoO+zMmp4WlXKu7zbwpg=="300
TXT"stripe-verification=a9d792834a9c24f3f90fe0b216a3d66705b61d08273285eee2893302b95dcd32"300
TXT"-wGpKEgpfo6jL7nohepfQUltWErcI1Vi0mv85zpOZR"300
TXT"apple-domain-verification=KDzvhXe4cbQdtw8Y"300
TXT"safebreach-domain-verification=ca64ceb4-b0d6-435d-8b8c-53cf4d59ce29"300
TXT"liveramp-site-verification=n_i3Tkg19Zo-JK3LKOs9K67apIXNNIPHV3R9sqL44ig"300
TXT"ms-domain-verification=bd950146-1df1-4af0-a38b-854708f6dcda"300
TXT"fastly-domain-delegation-E5JMY13uUgB53j0ZLi0O-468499"300
TXT"76b80d6969864cfda3b60c36b2643d49"300
TXT"adobe-idp-site-verification=d332be15-fa0d-4864-98f9-9c3644c5ac8a"300
TXT"Dynatrace-site-verification=e5dbd556-f174-4bca-989a-4efe91e13489__55tpqrk2q9ekrhmuvo78chplb"300
TXT"canva-site-verification=hu9CaOVojRhpeblHl8jR9A"300
TXT"bv-domain-verification=4511837bcf163b8c16a14c58b88001a9d52f016635529838e2f2db2a9eb6575f"300
TXT"onetrust-domain-verification=f97e9af20bcf4a9ba78688c9522048f3"300
TXT"google-site-verification=yJy9n-g6ZDLu0q5loERegsi1Pd9_VOcIu3hXsKtwUnY"300
TXT"atlassian-domain-verification=nor4wlzlpaY1gIz969mmayWeyZtoFqKbgIK3MMwJxMXNWhz38adx1PL4lqgu1aW7"300
TXT"google-site-verification=fWX7AFcmhAcRRPQ0emsehKvrMfbrQ9QFAa8gx6zeACg"300
TXT"slack-domain-verification=RMMMdd6ERftoGPuVjHkRM8qRPjoBdOWmeKyZby5N"300
TXT"00d4x0000017z8ueau"300
TXT"asv=1c0ebb2071cb51a3a10723b1a46f839a"300
TXT"adobe-sign-verification=46b586473b87414e4981919c3f262b6c1bef554054c3440592999625b97827e6"300
TXT"google-site-verification=GwZmYLXQkVJ3dAHFikZAjTpNkOxNeACna67kuYTUyAM"300
TXT"anthropic-domain-verification-ehbs8b=HPz9di3090qUVYnDn1zwLy6Kh"300
TXT"openai-domain-verification=dv-ryTdqunpfQYdMnfMWCJi75lK"300
TXT"paloaltonetworks-site-verification=95a972bd8961a19c73c58da5f119dc0cfa8c06b78201558bc7dc0c025e2ebdda"300
TXT"fastly-domain-delegation-haFdRK5qtE-604165-202305068"300
TXT"openai-domain-verification=dv-qzlk1GkyAX1fajU1U6nLbODv"300
TXT"c5f9f28f-53f4-4432-b9a8-4226caf3836d"300
TXT"paloaltonetworks-site-verification=73090b8854fd74bf017e1d7d38bb667e7f41b1302c2c9922c8ef1555edbee9a5"300
TXT"stripe-verification=1703d5043e7a37bcf7764c103a0758402b25e804c5e2f13d7c2456fc99f659e9"300
TXT"onetrust-domain-verification=62b477d4d6c84ab2b26460e78b470ccd"300
TXT"apple-domain-verification=hGGENQSuBO2ijTe0MrJoeQs5S2x1z-fEJ-IrsxWFIgQ"300
CAA0 issuewild "digicert.com"300
CAA0 issue "digicert.com"300
CAA0 iodef "mailto:pki-admin@t-mobile.com"300
CAA0 issue "letsencrypt.org"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 15m, MX 5m, NS 5m. The NS TTL at the parent is 2d and in the zone 5m; 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: digicert.com, letsencrypt.org.