t-com.de

Checked 22 October 2026, 00:31 UTC · via 8.8.8.8
!Passed with warnings
23 passed 1 warning 0 failed 5 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

dns1.telekom.de, dns2.telekom.de, pns.dtag.de, secondary004.dtag.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.telekom.de, dns2.telekom.de, pns.dtag.de, secondary004.dtag.net
NS in the zone
dns1.telekom.de, dns2.telekom.de, pns.dtag.de, secondary004.dtag.net
NameserverAddressesNetwork (AS)Glue
dns1.telekom.de194.25.225.19AS3320 DTAG - Deutsche Telekom AG, DE194.25.225.19
dns2.telekom.de194.25.225.3AS3320 DTAG - Deutsche Telekom AG, DE194.25.225.3
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
secondary004.dtag.net195.244.245.27 2a00:fa8:3:0:100:0:4:1AS5605 NETUSE - NetUSE AG, DE AS5605 NETUSE - NetUSE AG, DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to dns1.telekom.de, dns2.telekom.de, pns.dtag.de, secondary004.dtag.net.
  • ✓ 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 3 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS3320 (DTAG - Deutsche Telekom AG, DE): 4 addresses; AS5605 (NETUSE - NetUSE AG, DE): 2 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: dns1.telekom.de, dns2.telekom.de.
    #13

Nameservers

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.telekom.de 194.25.225.19NOERROR, 10 ms, authoritativenoyes / yesrefused-
dns2.telekom.de 194.25.225.3NOERROR, 8 ms, authoritativenoyes / yesrefused-
pns.dtag.de 194.25.0.125NOERROR, 10 ms, authoritativenoyes / yesrefusedDomainNameServer
pns.dtag.de 2003:40:8000::100NOERROR, 7 ms, authoritativenoyes / yesrefusedDomainNameServer
secondary004.dtag.net 195.244.245.27NOERROR, 13 ms, authoritativenoyes / yesrefusedDomainNameServer
secondary004.dtag.net 2a00:fa8:3:0:100:0:4:1NOERROR, 18 ms, authoritativenoyes / yesrefusedDomainNameServer

Checks

  • ✓ All respond #14
    All 6 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: pns.dtag.de: "DomainNameServer"; secondary004.dtag.net: "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 2019031850 · primary dns1.telekom.de

Found

Primary (MNAME)
dns1.telekom.de
Contact (RNAME)
dnsadmin.t-systems.com
Serial
2019031850
Refresh / retry
10800 s / 1800 s
Expire
604800 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
dns1.telekom.de (194.25.225.19)2019031850
dns2.telekom.de (194.25.225.3)2019031850
pns.dtag.de (194.25.0.125)2019031850
pns.dtag.de (2003:40:8000::100)2019031850
secondary004.dtag.net (195.244.245.27)2019031850
secondary004.dtag.net (2a00:fa8:3:0:100:0:4:1)2019031850

Checks

  • ✓ Serial 2019031850 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 30m, expire 7d, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns1.telekom.de is one of the listed nameservers.
  • ✓ Contact dnsadmin@t-systems.com #25
    The SOA RNAME dnsadmin.t-systems.com means dnsadmin@t-systems.com.
  • ✓ Date-based serial #26
    The serial 2019031850 follows the YYYYMMDDnn convention (2019-03-18).

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

7 records at the apex

Found

Read from
194.25.225.19:53
TypeValueTTL
SOAdns1.telekom.de. dnsadmin.t-systems.com. 2019031850 10800 1800 604800 6003600
NSdns1.telekom.de.3600
NSdns2.telekom.de.3600
NSsecondary004.dtag.net.3600
NSpns.dtag.de.3600
A80.158.66.2486400
MX100 mailin.ng.telekom.net.3600

Checks

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