c3voc.de

Checked 21 October 2026, 22:04 UTC · via 8.8.8.8
!Passed with warnings
26 passed 3 warnings 0 failed 3 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

ns.alb.c3voc.de, ns.bre.c3voc.de, ns.dus.c3voc.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.alb.c3voc.de, ns.bre.c3voc.de, ns.dus.c3voc.de
NS in the zone
ns.alb.c3voc.de, ns.bre.c3voc.de, ns.dus.c3voc.de
NameserverAddressesNetwork (AS)Glue
ns.alb.c3voc.de185.106.84.22 2001:67c:20a0:e::22AS50472 CHAOS-AS - Chaos Computer Club e.V., DE AS50472 CHAOS-AS - Chaos Computer Club e.V., DE185.106.84.22 2001:67c:20a0:e::22
ns.bre.c3voc.de193.203.16.40 2a00:c380:c101:2800::40AS50629 LWLCOM - LWLcom GmbH, DE AS50629 LWLCOM - LWLcom GmbH, DE193.203.16.40 2a00:c380:c101:2800::40
ns.dus.c3voc.de46.228.205.56 2001:4ba0:92c1:9f:46:228:205:56AS24961 MYLOC-AS - WIIT AG, DE AS24961 MYLOC-AS - WIIT AG, DE46.228.205.56 2001:4ba0:92c1:9f:46:228:205:56

Checks

  • ✓ 3 nameservers #6
    Delegated to ns.alb.c3voc.de, ns.bre.c3voc.de, ns.dus.c3voc.de.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns.alb.c3voc.de, ns.bre.c3voc.de, ns.dus.c3voc.de.
  • ✓ 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 3 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS24961 (MYLOC-AS - WIIT AG, DE): 2 addresses; AS50472 (CHAOS-AS - Chaos Computer Club e.V., DE): 2 addresses; AS50629 (LWLCOM - LWLcom GmbH, DE): 2 addresses.
  • 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

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.alb.c3voc.de 185.106.84.22NOERROR, 11 ms, authoritativenoyes / yesrefusedKnot DNS 3.5.3
ns.alb.c3voc.de 2001:67c:20a0:e::22NOERROR, 12 ms, authoritativenoyes / yesrefusedKnot DNS 3.5.3
ns.bre.c3voc.de 193.203.16.40NOERROR, 10 ms, authoritativenoyes / yesrefusedKnot DNS 3.5.4
ns.bre.c3voc.de 2a00:c380:c101:2800::40NOERROR, 10 ms, authoritativenoyes / yesrefusedKnot DNS 3.5.4
ns.dus.c3voc.de 46.228.205.56NOERROR, 8 ms, authoritativenoyes / yesrefusedKnot DNS 3.5.4
ns.dus.c3voc.de 2001:4ba0:92c1:9f:46:228:205:56NOERROR, 8 ms, authoritativenoyes / yesrefusedKnot DNS 3.5.4

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns.alb.c3voc.de: "Knot DNS 3.5.3"; ns.bre.c3voc.de: "Knot DNS 3.5.4"; ns.dus.c3voc.de: "Knot DNS 3.5.4". 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

pass

serial 2026041002 · primary ns.bre.c3voc.de

Found

Primary (MNAME)
ns.bre.c3voc.de
Contact (RNAME)
zonemaster.c3voc.de
Serial
2026041002
Refresh / retry
86400 s / 7200 s
Expire
3600000 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
ns.alb.c3voc.de (185.106.84.22)2026041002
ns.alb.c3voc.de (2001:67c:20a0:e::22)2026041002
ns.bre.c3voc.de (193.203.16.40)2026041002
ns.bre.c3voc.de (2a00:c380:c101:2800::40)2026041002
ns.dus.c3voc.de (46.228.205.56)2026041002
ns.dus.c3voc.de (2001:4ba0:92c1:9f:46:228:205:56)2026041002

Checks

  • ✓ Serial 2026041002 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 2h, expire 1000h, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.bre.c3voc.de is one of the listed nameservers.
  • ✓ Contact zonemaster@c3voc.de #25
    The SOA RNAME zonemaster.c3voc.de means zonemaster@c3voc.de.
  • ✓ Date-based serial #26
    The serial 2026041002 follows the YYYYMMDDnn convention (2026-04-10).

DNSSEC

warn

Signed, but no DS at parent

Found

Validated by resolver
no
Denial of existence
NSEC3
NSEC3
10 iterations, 20-byte salt
Signatures valid until
31 October 2026

DNSKEY in the zone

Key tagRoleAlgorithm
54495ZSK (256)ECDSAP256SHA256 (13)
48882KSK (257)ECDSAP256SHA256 (13)

Checks

  • !
    Signed but not delegated securely
    The zone is signed but the parent has no DS record, so the signatures are not used. Publish the DS record at your registrar.
    #27
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-10-31 #30
    The earliest DNSKEY/SOA signature expires at 2026-10-31 18:53 UTC.
  • !
    NSEC3 with extra iterations or salt
    NSEC3 uses 10 iterations and a 20-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.
    #31

Records

pass

9 records at the apex

Found

Read from
185.106.84.22:53
TypeValueTTL
SOAns.bre.c3voc.de. zonemaster.c3voc.de. 2026041002 86400 7200 3600000 600600
NSns.alb.c3voc.de.600
NSns.bre.c3voc.de.600
NSns.dus.c3voc.de.600
A185.106.84.46600
AAAA2001:67c:20a0:e::175600
MX10 mail.c3voc.de.600
TXT"v=spf1 mx ~all"600
CAA1 issue "letsencrypt.org"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, AAAA 10m, MX 10m, NS 10m. The NS TTL at the parent is 1d and in the zone 10m; 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: letsencrypt.org.