ccc-mannheim.de

Checked 21 October 2026, 22:06 UTC · via 8.8.8.8
!Passed with warnings
20 passed 3 warnings 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

apfelkirsch.raumzeitlabor.de, kungsmynta.c3ma.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
apfelkirsch.raumzeitlabor.de, kungsmynta.c3ma.de
NS in the zone
apfelkirsch.raumzeitlabor.de, kungsmynta.c3ma.de
NameserverAddressesNetwork (AS)Glue
apfelkirsch.raumzeitlabor.de65.108.68.44 2a01:4f9:6b:4405::2AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE-
kungsmynta.c3ma.de5.9.83.217 2a01:4f8:162:302:5054:ff:fe27:b7acAS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE5.9.83.217 2a01:4f8:162:302:5054:ff:fe27:b7ac

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: apfelkirsch.raumzeitlabor.de, kungsmynta.c3ma.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
apfelkirsch.raumzeitlabor.de 65.108.68.44NOERROR, 24 ms, authoritativenoyes / yesrefusedKnot DNS 3.4.9
apfelkirsch.raumzeitlabor.de 2a01:4f9:6b:4405::2NOERROR, 24 ms, authoritativenoyes / yesrefusedKnot DNS 3.4.9
kungsmynta.c3ma.de 5.9.83.217NOERROR, 4 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.24.04.8-Ubuntu
kungsmynta.c3ma.de 2a01:4f8:162:302:5054:ff:fe27:b7acNOERROR, 4 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.24.04.8-Ubuntu

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: apfelkirsch.raumzeitlabor.de: "Knot DNS 3.4.9"; kungsmynta.c3ma.de: "9.18.39-0ubuntu0.24.04.8-Ubuntu". 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

warn

serial 2026102101 · primary kungsmynta.c3ma.de

Found

Primary (MNAME)
kungsmynta.c3ma.de
Contact (RNAME)
info.ccc-mannheim.de
Serial
2026102101
Refresh / retry
1800 s / 600 s
Expire
86400 s
Negative TTL
120 s

Serial per nameserver

NameserverSerial
apfelkirsch.raumzeitlabor.de (65.108.68.44)2026102101
apfelkirsch.raumzeitlabor.de (2a01:4f9:6b:4405::2)2026102101
kungsmynta.c3ma.de (5.9.83.217)2026102101
kungsmynta.c3ma.de (2a01:4f8:162:302:5054:ff:fe27:b7ac)2026102101

Checks

  • ✓ Serial 2026102101 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    expire 1d is shorter than 7d; secondaries stop answering too soon when the primary is down; negative caching TTL (minimum) 2m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 30m, retry 10m, expire 1d, negative TTL 2m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver kungsmynta.c3ma.de is one of the listed nameservers.
  • ✓ Contact info@ccc-mannheim.de #25
    The SOA RNAME info.ccc-mannheim.de means info@ccc-mannheim.de.
  • ✓ Date-based serial #26
    The serial 2026102101 follows the YYYYMMDDnn convention (2026-10-21).

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

8 records at the apex

Found

Read from
65.108.68.44:53
TypeValueTTL
SOAkungsmynta.c3ma.de. info.ccc-mannheim.de. 2026102101 1800 600 86400 120300
NSkungsmynta.c3ma.de.300
NSapfelkirsch.raumzeitlabor.de.300
A5.9.83.217300
AAAA2a01:4f8:162:302:5054:ff:fe3c:7d31300
MX10 mail.ccc-mannheim.de.300
TXT"v=spf1 a mx -all"300
TXT"google-site-verification=Ug0bZi5TK2eJUy7IB56fUCXUl-l_FlluxENlyNx6KY4"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 5m, NS 5m. The NS TTL at the parent is 1d and in the zone 5m; 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