linuxwiki.de

Checked 21 October 2026, 23:20 UTC · via 8.8.8.8
!Passed with warnings
20 passed 2 warnings 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

ns1.thinkmo.de, ns2.thinkmo.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.thinkmo.de, ns2.thinkmo.de
NS in the zone
ns1.thinkmo.de, ns2.thinkmo.de
NameserverAddressesNetwork (AS)Glue
ns1.thinkmo.de162.55.237.202 2a01:4f8:271:3f5c:0:53:0:1AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE162.55.237.202 2a01:4f8:271:3f5c:0:53:0:1
ns2.thinkmo.de49.12.204.155 2a01:4f8:1c1c:f3d2::1AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE49.12.204.155 2a01:4f8:1c1c:f3d2::1

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.thinkmo.de, ns2.thinkmo.de.
    #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.
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 2 IPv4 /24s and 2 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 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 .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

warn

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.thinkmo.de 162.55.237.202NOERROR, 3 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.9.17
ns1.thinkmo.de 2a01:4f8:271:3f5c:0:53:0:1NOERROR, 3 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.9.17
ns2.thinkmo.de 49.12.204.155NOERROR, 8 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.9.17
ns2.thinkmo.de 2a01:4f8:1c1c:f3d2::1NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.9.17

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns1.thinkmo.de: "PowerDNS Authoritative Server 4.9.17"; ns2.thinkmo.de: "PowerDNS Authoritative Server 4.9.17". 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 2026091202 · primary dnsmaster.thinkmo.de

Found

Primary (MNAME)
dnsmaster.thinkmo.de
Contact (RNAME)
root.thinkmo.de
Serial
2026091202
Refresh / retry
14400 s / 3600 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns1.thinkmo.de (162.55.237.202)2026091202
ns1.thinkmo.de (2a01:4f8:271:3f5c:0:53:0:1)2026091202
ns2.thinkmo.de (49.12.204.155)2026091202
ns2.thinkmo.de (2a01:4f8:1c1c:f3d2::1)2026091202

Checks

  • ✓ Serial 2026091202 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 7d, negative TTL 1h.
  • i
    Hidden master (not resolvable)
    The primary nameserver dnsmaster.thinkmo.de is not listed as a nameserver and does not resolve publicly: a hidden master, or a placeholder name. Some tools (e.g. dynamic updates) use MNAME to find the primary.
    #24
  • ✓ Contact root@thinkmo.de #25
    The SOA RNAME root.thinkmo.de means root@thinkmo.de.
  • ✓ Date-based serial #26
    The serial 2026091202 follows the YYYYMMDDnn convention (2026-09-12).

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

info

6 records at the apex

Found

Read from
162.55.237.202:53
TypeValueTTL
SOAdnsmaster.thinkmo.de. root.thinkmo.de. 2026091202 14400 3600 604800 36003600
NSns1.thinkmo.de.3600
NSns2.thinkmo.de.3600
A162.55.237.2023600
MX10 mx.thinkmo.de.3600
TXT"v=spf1 redirect=thinkmo.de"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, 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