t-online.de

Checked 22 October 2026, 00:31 UTC · via 8.8.8.8
!Passed with warnings
22 passed 1 warning 0 failed 6 info

Registration

info

.de country-code

Found

TLD
.de (country-code)
ICANN policies apply
no

Checks

  • i
    .de is a country-code TLD (ccTLD)
    Country-code TLD: governed by its local registry under national policy, not by an ICANN contract. Registrar accreditation, dispute resolution and RDAP/WHOIS rules are set by the registry.
    #1
  • ✓ TLD delegated and signed #2
    .de is delegated in the root zone and DNSSEC-signed.
  • i
    Registration data not available
    No registration data via RDAP: the registry of .de offers no RDAP service. Many ccTLD registries don't offer RDAP; check the registry's WHOIS instead.
    #3

Delegation

info

dns00.dns.t-ipnet.de, dns02.dns.t-ipnet.de, dns20.dns.t-ipnet.de, dns50.dns.t-ipnet.de, pns.dtag.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns00.dns.t-ipnet.de, dns02.dns.t-ipnet.de, dns20.dns.t-ipnet.de, dns50.dns.t-ipnet.de, pns.dtag.de
NS in the zone
dns00.dns.t-ipnet.de, dns02.dns.t-ipnet.de, dns20.dns.t-ipnet.de, dns50.dns.t-ipnet.de, pns.dtag.de
NameserverAddressesNetwork (AS)Glue
dns00.dns.t-ipnet.de194.25.2.170 2003:180:4:a::53AS3320 DTAG - Deutsche Telekom AG, DE AS3320 DTAG - Deutsche Telekom AG, DE194.25.2.170 2003:180:4:a::53
dns02.dns.t-ipnet.de194.25.2.172 2003:180:4:a::1:53AS3320 DTAG - Deutsche Telekom AG, DE AS3320 DTAG - Deutsche Telekom AG, DE194.25.2.172 2003:180:4:a::1:53
dns20.dns.t-ipnet.de212.185.24.129 2003:180:a:2000::53AS3320 DTAG - Deutsche Telekom AG, DE AS3320 DTAG - Deutsche Telekom AG, DE212.185.24.129 2003:180:a:2000::53
dns50.dns.t-ipnet.de217.5.100.183 2003:180:4:10a::2:53AS3320 DTAG - Deutsche Telekom AG, DE AS3320 DTAG - Deutsche Telekom AG, DE217.5.100.183 2003:180:4:10a::2:53
pns.dtag.de194.25.0.125 2003:40:8000::100AS3320 DTAG - Deutsche Telekom AG, DE AS3320 DTAG - Deutsche Telekom AG, DE194.25.0.125 2003:40:8000::100

Checks

  • ✓ 5 nameservers #6
    Delegated to dns00.dns.t-ipnet.de, dns02.dns.t-ipnet.de, dns20.dns.t-ipnet.de, dns50.dns.t-ipnet.de, pns.dtag.de.
  • ✓ 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 4 IPv4 /24s and 3 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS3320 (DTAG - Deutsche Telekom AG, DE): 10 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 .de
    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

10 of 10 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns00.dns.t-ipnet.de 194.25.2.170NOERROR, 9 ms, authoritativenoyes / yesrefuseddns
dns00.dns.t-ipnet.de 2003:180:4:a::53NOERROR, 9 ms, authoritativenoyes / yesrefuseddns
dns02.dns.t-ipnet.de 194.25.2.172NOERROR, 10 ms, authoritativenoyes / yesrefuseddns
dns02.dns.t-ipnet.de 2003:180:4:a::1:53NOERROR, 9 ms, authoritativenoyes / yesrefuseddns
dns20.dns.t-ipnet.de 212.185.24.129NOERROR, 3 ms, authoritativenoyes / yesrefuseddns
dns20.dns.t-ipnet.de 2003:180:a:2000::53NOERROR, 7 ms, authoritativenoyes / yesrefuseddns
dns50.dns.t-ipnet.de 217.5.100.183NOERROR, 10 ms, authoritativenoyes / yesrefuseddns
dns50.dns.t-ipnet.de 2003:180:4:10a::2:53NOERROR, 9 ms, authoritativenoyes / yesrefuseddns
pns.dtag.de 194.25.0.125NOERROR, 9 ms, authoritativenoyes / yesrefusedDomainNameServer
pns.dtag.de 2003:40:8000::100NOERROR, 7 ms, authoritativenoyes / yesrefusedDomainNameServer

Checks

  • ✓ All respond #14
    All 10 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: dns00.dns.t-ipnet.de: "dns"; dns02.dns.t-ipnet.de: "dns"; dns20.dns.t-ipnet.de: "dns"; dns50.dns.t-ipnet.de: "dns"; pns.dtag.de: "DomainNameServer".
    #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 2026100700 · primary dns00.dns.t-ipnet.de

Found

Primary (MNAME)
dns00.dns.t-ipnet.de
Contact (RNAME)
dns.telekom.de
Serial
2026100700
Refresh / retry
10800 s / 1800 s
Expire
3024000 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dns00.dns.t-ipnet.de (194.25.2.170)2026100700
dns00.dns.t-ipnet.de (2003:180:4:a::53)2026100700
dns02.dns.t-ipnet.de (194.25.2.172)2026100700
dns02.dns.t-ipnet.de (2003:180:4:a::1:53)2026100700
dns20.dns.t-ipnet.de (212.185.24.129)2026100700
dns20.dns.t-ipnet.de (2003:180:a:2000::53)2026100700
dns50.dns.t-ipnet.de (217.5.100.183)2026100700
dns50.dns.t-ipnet.de (2003:180:4:10a::2:53)2026100700
pns.dtag.de (194.25.0.125)2026100700
pns.dtag.de (2003:40:8000::100)2026100700

Checks

  • ✓ Serial 2026100700 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 30m, expire 35d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns00.dns.t-ipnet.de is one of the listed nameservers.
  • ✓ Contact dns@telekom.de #25
    The SOA RNAME dns.telekom.de means dns@telekom.de.
  • ✓ Date-based serial #26
    The serial 2026100700 follows the YYYYMMDDnn convention (2026-10-07).

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

info

25 records at the apex

Found

Read from
194.25.2.170:53
TypeValueTTL
SOAdns00.dns.t-ipnet.de. dns.telekom.de. 2026100700 10800 1800 3024000 360086400
NSpns.dtag.de.86400
NSdns00.dns.t-ipnet.de.86400
NSdns50.dns.t-ipnet.de.86400
NSdns20.dns.t-ipnet.de.86400
NSdns02.dns.t-ipnet.de.86400
A52.209.116.123300
A54.217.253.146300
A34.246.241.220300
MX10 mx00.t-online.de.7200
MX10 mx03.t-online.de.7200
MX10 mx01.t-online.de.7200
MX10 mx02.t-online.de.7200
TXT"google-site-verification=kLomR9c2yDgU-AUYNr9ma0XbvmzaOR_ZCv_ppOvbB6Y"86400
TXT"google-site-verification=dNVp8NLTkRfU1YikWSzxglE25kMfUtFNyoiIxcnxiRc"86400
TXT"google-site-verification=kOtokoaNZwnXoLMiWNnaX3leVCyA9DaOlP1IJKYu1DI"86400
TXT"google-site-verification=s1qp7xSUgoBjWm5tTL7j8c-opGfm7YdlIBkutNbS_kA"86400
TXT"google-site-verification=iWR1RQhHveaJJ6nA9hzy33ShctIVRr1_n6o5H7n20jk"86400
TXT"google-site-verification=YCYBJAGc1hE2hjEuhkLfNgzbAc1WWOi5AKyoCDlrhcE"86400
TXT"google-site-verification=Zl48ijjwoVxIifNuZ5ozcydysO5owxNB1Z4V--dkgE0"86400
TXT"v=spf1 ip4:194.25.134.16/28 ip4:194.25.134.80/28 ~all"86400
TXT"google-site-verification=pOdK8ndAYqDGA8-03SAwZoeJvnSWE50S25j_63u0FWw"86400
TXT"google-site-verification=RuaGdsiIYwzDsAd0_s7yhFgYuYRc0Ylk01j209Mgvis"86400
TXT"google-site-verification=cKQjq9M78jbRX073a91_V3oBM76hqbQDnK2uGelDpto"86400
TXT"BSI103622123645"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 2h, NS 1d.
  • ✓ 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