sitzung-online.de

Checked 22 October 2026, 00:10 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 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

ns1.dns.stackit.cloud, ns2.dns.stackit.cloud

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.dns.stackit.cloud, ns2.dns.stackit.cloud
NS in the zone
ns1.dns.stackit.cloud, ns2.dns.stackit.cloud
NameserverAddressesNetwork (AS)Glue
ns1.dns.stackit.cloud192.174.68.16 2001:67c:1bc::16AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns2.dns.stackit.cloud176.97.158.16 2001:67c:10b8::16AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.dns.stackit.cloud, ns2.dns.stackit.cloud.
    #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 (AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 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 .cloud
    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

info

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.dns.stackit.cloud 192.174.68.16NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns1.dns.stackit.cloud 2001:67c:1bc::16NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns2.dns.stackit.cloud 176.97.158.16NOERROR, 12 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns2.dns.stackit.cloud 2001:67c:10b8::16NOERROR, 13 ms, authoritativenoyes / yesrefusedRcodeZero DNS

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: ns1.dns.stackit.cloud: "RcodeZero DNS"; ns2.dns.stackit.cloud: "RcodeZero DNS".
    #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 2026102012 · primary ns1.dns.stackit.cloud

Found

Primary (MNAME)
ns1.dns.stackit.cloud
Contact (RNAME)
tco-helpdesk.cc-egov.de
Serial
2026102012
Refresh / retry
3600 s / 600 s
Expire
1209600 s
Negative TTL
60 s

Serial per nameserver

NameserverSerial
ns1.dns.stackit.cloud (192.174.68.16)2026102012
ns1.dns.stackit.cloud (2001:67c:1bc::16)2026102012
ns2.dns.stackit.cloud (176.97.158.16)2026102012
ns2.dns.stackit.cloud (2001:67c:10b8::16)2026102012

Checks

  • ✓ Serial 2026102012 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    negative caching TTL (minimum) 1m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 1h, retry 10m, expire 14d, negative TTL 1m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.dns.stackit.cloud is one of the listed nameservers.
  • ✓ Contact tco-helpdesk@cc-egov.de #25
    The SOA RNAME tco-helpdesk.cc-egov.de means tco-helpdesk@cc-egov.de.
  • ✓ Date-based serial #26
    The serial 2026102012 follows the YYYYMMDDnn convention (2026-10-20).

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

pass

12 records at the apex

Found

Read from
192.174.68.16:53
TypeValueTTL
SOAns1.dns.stackit.cloud. tco-helpdesk.cc-egov.de. 2026102012 3600 600 1209600 60300
NSns1.dns.stackit.cloud.300
NSns2.dns.stackit.cloud.300
A45.129.42.169300
MX30 redirect.m2soft.com.300
TXT"v=spf1 mx a:mailversand.sitzung-online.de ~all"60
TXT"_globalsign-domain-verification=dYQRzpXjz9UvOeOlKFI_IaHPhGrgVjHG4BfB8nY24_"60
CAA0 iodef "mailto:support@m2soft.com"300
CAA0 issue "digicert.com"300
CAA0 issue "globalsign.com"300
CAA0 issue "letsencrypt.org"300
CAA0 issuewild ";"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: digicert.com, globalsign.com, letsencrypt.org, none (issuance forbidden).