geizhals.de

Checked 21 October 2026, 22:40 UTC · via 8.8.8.8
✗Problems found
21 passed 3 warnings 1 failed 4 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

warn

a.ns.geizhals.at, b.ns.geizhals.at, c.ns.geizhals.at, d.ns.geizhals.at

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
a.ns.geizhals.at, b.ns.geizhals.at, c.ns.geizhals.at, d.ns.geizhals.at
NS in the zone
a.ns.geizhals.at, b.ns.geizhals.at, c.ns.geizhals.at, d.ns.geizhals.at
NameserverAddressesNetwork (AS)Glue
a.ns.geizhals.at81.223.238.138AS8412 TMA - T-Mobile Austria GmbH, AT-
b.ns.geizhals.at213.229.61.38AS8412 TMA - T-Mobile Austria GmbH, AT-
c.ns.geizhals.at176.9.86.19AS24940 HETZNER-AS - Hetzner Online GmbH, DE-
d.ns.geizhals.at217.79.181.16AS24961 MYLOC-AS - WIIT AG, DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to a.ns.geizhals.at, b.ns.geizhals.at, c.ns.geizhals.at, d.ns.geizhals.at.
  • ✓ 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 0 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 1 address; AS24961 (MYLOC-AS - WIIT AG, DE): 1 address; AS8412 (TMA - T-Mobile Austria GmbH, AT): 2 addresses.
  • i
    All nameserver names under .at
    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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

fail

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a.ns.geizhals.at 81.223.238.138NOERROR, 9 ms, authoritativenoyes / yesrefusedGHDNS
b.ns.geizhals.at 213.229.61.38NOERROR, 11 ms, authoritativenoyes / yesrefusedGHDNS
c.ns.geizhals.at 176.9.86.19NOERROR, 3 ms, authoritativenoyes / yesrefusedGHDNS
d.ns.geizhals.at 217.79.181.16NOERROR, 7 ms, authoritativenono / yesrefusedGHDNS

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: a.ns.geizhals.at: "GHDNS"; b.ns.geizhals.at: "GHDNS"; c.ns.geizhals.at: "GHDNS"; d.ns.geizhals.at: "GHDNS".
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: d.ns.geizhals.at (217.79.181.16): dial tcp 217.79.181.16:53: i/o timeout.
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 1448894436 · primary a.ns.geizhals.at

Found

Primary (MNAME)
a.ns.geizhals.at
Contact (RNAME)
hostmaster.geizhals.at
Serial
1448894436
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
a.ns.geizhals.at (81.223.238.138)1448894436
b.ns.geizhals.at (213.229.61.38)1448894436
c.ns.geizhals.at (176.9.86.19)1448894436
d.ns.geizhals.at (217.79.181.16)1448894436

Checks

  • ✓ Serial 1448894436 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a.ns.geizhals.at is one of the listed nameservers.
  • ✓ Contact hostmaster@geizhals.at #25
    The SOA RNAME hostmaster.geizhals.at means hostmaster@geizhals.at.
  • ✓ Timestamp serial #26
    The serial 1448894436 is a Unix timestamp (2015-11-30 14:40 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

warn

13 records at the apex

Found

Read from
81.223.238.138:53
TypeValueTTL
SOAa.ns.geizhals.at. hostmaster.geizhals.at. 1448894436 10800 3600 604800 864002560
NSa.ns.geizhals.at.259200
NSd.ns.geizhals.at.259200
NSc.ns.geizhals.at.259200
NSb.ns.geizhals.at.259200
A104.18.18.33211
A104.18.19.33211
AAAA2606:4700::6812:1321215
AAAA2606:4700::6812:1221215
MX5 mail.geizhals.at.7200
TXT"google-site-verification:cqgdGssLbMmgQFHWF1LyvqJ9PYBbu9gcmcjHVouB85I"3600
TXT"v=spf1 mx ip4:213.229.61.34 ip4:81.223.238.136 -all"3600
CAA0 issue "letsencrypt.org"3600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (3m31s), AAAA (3m35s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 3d; 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: letsencrypt.org.