verfassungen.de

Checked 22 October 2026, 00:51 UTC · via 8.8.8.8
✗Problems found
18 passed 3 warnings 1 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

warn

ns051.servertown.ch, ns052.servertown.ch

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns051.servertown.ch, ns052.servertown.ch
NS in the zone
ns051.servertown.ch, ns052.servertown.ch
NameserverAddressesNetwork (AS)Glue
ns051.servertown.ch94.231.94.128 2a00:41c0:94:231:94::128AS48971 DATAWIRE-AS - DATAWIRE AG, CH AS48971 DATAWIRE-AS - DATAWIRE AG, CH-
ns052.servertown.ch94.231.94.129 2a00:41c0:94:231:94::129AS48971 DATAWIRE-AS - DATAWIRE AG, CH AS48971 DATAWIRE-AS - DATAWIRE AG, CH-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns051.servertown.ch, ns052.servertown.ch.
    #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 one network
    all IPv4 addresses are in 94.231.94.0/24; all IPv6 addresses are in 2a00:41c0:94::/48. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS48971 (DATAWIRE-AS - DATAWIRE AG, CH): 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 .ch
    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

fail

2 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns051.servertown.ch 94.231.94.128no responsenono / no--
ns051.servertown.ch 2a00:41c0:94:231:94::128NOERROR, 11 ms, authoritativenoyes / yesrefusednone
ns052.servertown.ch 94.231.94.129no responsenono / no--
ns052.servertown.ch 2a00:41c0:94:231:94::129NOERROR, 11 ms, authoritativenoyes / yesrefusednone

Checks

  • ✗
    Nameservers not responding
    These addresses did not answer, so resolvers waste time on timeouts: ns051.servertown.ch (94.231.94.128): read udp 46.225.38.91:34459->94.231.94.128:53: i/o timeout; ns052.servertown.ch (94.231.94.129): read udp 46.225.38.91:56209->94.231.94.129:53: i/o timeout.
    #14
  • ✓ 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: ns051.servertown.ch: "none"; ns052.servertown.ch: "none".
    #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 2026100201 · primary ns051.servertown.ch

Found

Primary (MNAME)
ns051.servertown.ch
Contact (RNAME)
thomas\.clement.tac-a.de
Serial
2026100201
Refresh / retry
3600 s / 3600 s
Expire
604800 s
Negative TTL
7200 s

Serial per nameserver

NameserverSerial
ns051.servertown.ch (2a00:41c0:94:231:94::128)2026100201
ns052.servertown.ch (2a00:41c0:94:231:94::129)2026100201

Checks

  • ✓ Serial 2026100201 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    retry 1h should be shorter than refresh 1h. Current values: refresh 1h, retry 1h, expire 7d, negative TTL 2h.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns051.servertown.ch is one of the listed nameservers.
  • ✓ Contact thomas.clement@tac-a.de #25
    The SOA RNAME thomas\.clement.tac-a.de means thomas.clement@tac-a.de.
  • ✓ Date-based serial #26
    The serial 2026100201 follows the YYYYMMDDnn convention (2026-10-02).

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

7 records at the apex

Found

Read from
[2a00:41c0:94:231:94::128]:53
TypeValueTTL
SOAns051.servertown.ch. thomas\.clement.tac-a.de. 2026100201 3600 3600 604800 72007200
NSns052.servertown.ch.7200
NSns051.servertown.ch.7200
A94.231.94.1287200
AAAA2a00:41c0:94:231:94::1287200
MX10 mail.verfassungen.de.7200
TXT"v=spf1 +a +mx +a:www05.servertown.ch -all"7200

Checks

  • ✓ TTLs within range #32
    TTLs: A 2h, AAAA 2h, MX 2h, 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.
  • 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