gtz.de

Checked 21 October 2026, 22:41 UTC · via 8.8.8.8
!Passed with warnings
21 passed 1 warning 0 failed 7 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

auth04.ns.de.uu.net, auth54.ns.de.uu.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
auth04.ns.de.uu.net, auth54.ns.de.uu.net
NS in the zone
auth04.ns.de.uu.net, auth54.ns.de.uu.net
NameserverAddressesNetwork (AS)Glue
auth04.ns.de.uu.net192.76.144.17 2001:600:1c0:e000::35:9AS702 UUNET - Verizon Business, US AS702 UUNET - Verizon Business, US-
auth54.ns.de.uu.net194.128.171.100 2001:600:1c0:e001::35:9AS702 UUNET - Verizon Business, US AS702 UUNET - Verizon Business, US-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: auth04.ns.de.uu.net, auth54.ns.de.uu.net.
    #6
  • ✓ 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.
  • i
    One address family in one network
    all IPv6 addresses are in 2001:600:1c0::/48, while the other address family is spread over several networks.
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS702 (UUNET - Verizon Business, US): 4 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

pass

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
auth04.ns.de.uu.net 192.76.144.17NOERROR, 8 ms, authoritativenoyes / yesrefused-
auth04.ns.de.uu.net 2001:600:1c0:e000::35:9NOERROR, 7 ms, authoritativenoyes / yesrefused-
auth54.ns.de.uu.net 194.128.171.100NOERROR, 17 ms, authoritativenoyes / yesrefused-
auth54.ns.de.uu.net 2001:600:1c0:e001::35:9NOERROR, 17 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 4 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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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 2026101202 · primary ns1.gtz.de

Found

Primary (MNAME)
ns1.gtz.de
Contact (RNAME)
abuse.gtz.de
Serial
2026101202
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
auth04.ns.de.uu.net (192.76.144.17)2026101202
auth04.ns.de.uu.net (2001:600:1c0:e000::35:9)2026101202
auth54.ns.de.uu.net (194.128.171.100)2026101202
auth54.ns.de.uu.net (2001:600:1c0:e001::35:9)2026101202

Checks

  • ✓ Serial 2026101202 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 1d.
  • i
    Hidden master
    The primary nameserver ns1.gtz.de 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 abuse@gtz.de #25
    The SOA RNAME abuse.gtz.de means abuse@gtz.de.
  • ✓ Date-based serial #26
    The serial 2026101202 follows the YYYYMMDDnn convention (2026-10-12).

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

9 records at the apex

Found

Read from
192.76.144.17:53
TypeValueTTL
SOAns1.gtz.de. abuse.gtz.de. 2026101202 28800 7200 604800 864007200
NSAUTH04.NS.DE.UU.NET.7200
NSAUTH54.NS.DE.UU.NET.7200
A193.97.170.917200
MX0 gtz-de.mail.protection.outlook.com.3600
TXT"MS=ms12151196"3600
TXT"v=spf1 include:spf.protection.outlook.com ip4:193.97.169.16/28 -all"3600
CAA0 issue "sectigo.com"7200
CAA0 issue "digicert.com"7200

Checks

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