stiftung-ng.de

Checked 22 October 2026, 00:31 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

warn

ns-a.niedersachsen.de, ns-b.niedersachsen.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns-a.niedersachsen.de, ns-b.niedersachsen.de
NS in the zone
ns-a.niedersachsen.de, ns-b.niedersachsen.de
NameserverAddressesNetwork (AS)Glue
ns-a.niedersachsen.de80.228.49.9 2a02:1060:0:b000::1:3AS9145 EWETEL - EWE TEL GmbH, DE AS9145 EWETEL - EWE TEL GmbH, DE80.228.49.9 2a02:1060:0:b000::1:3
ns-b.niedersachsen.de80.228.49.10 2a02:1060:0:b000::1:4AS9145 EWETEL - EWE TEL GmbH, DE AS9145 EWETEL - EWE TEL GmbH, DE80.228.49.10 2a02:1060:0:b000::1:4

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns-a.niedersachsen.de, ns-b.niedersachsen.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 one network
    all IPv4 addresses are in 80.228.49.0/24; all IPv6 addresses are in 2a02:1060::/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 (AS9145 (EWETEL - EWE TEL 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

pass

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns-a.niedersachsen.de 80.228.49.9NOERROR, 17 ms, authoritativenoyes / yesrefused-
ns-a.niedersachsen.de 2a02:1060:0:b000::1:3NOERROR, 17 ms, authoritativenoyes / yesrefused-
ns-b.niedersachsen.de 80.228.49.10NOERROR, 17 ms, authoritativenoyes / yesrefused-
ns-b.niedersachsen.de 2a02:1060:0:b000::1:4NOERROR, 17 ms, authoritativenoyes / yesrefused-

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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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 2026050601 · primary ns-a.niedersachsen.de

Found

Primary (MNAME)
ns-a.niedersachsen.de
Contact (RNAME)
dns-admin.niedersachsen.de
Serial
2026050601
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns-a.niedersachsen.de (80.228.49.9)2026050601
ns-a.niedersachsen.de (2a02:1060:0:b000::1:3)2026050601
ns-b.niedersachsen.de (80.228.49.10)2026050601
ns-b.niedersachsen.de (2a02:1060:0:b000::1:4)2026050601

Checks

  • ✓ Serial 2026050601 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-a.niedersachsen.de is one of the listed nameservers.
  • ✓ Contact dns-admin@niedersachsen.de #25
    The SOA RNAME dns-admin.niedersachsen.de means dns-admin@niedersachsen.de.
  • ✓ Date-based serial #26
    The serial 2026050601 follows the YYYYMMDDnn convention (2026-05-06).

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

warn

11 records at the apex

Found

Read from
80.228.49.9:53
TypeValueTTL
SOAns-a.niedersachsen.de. dns-admin.niedersachsen.de. 2026050601 10800 3600 604800 864003600
NSns-a.niedersachsen.de.3600
NSns-b.niedersachsen.de.3600
A88.198.220.203300
AAAA2a01:4f8:d0a:5383::2300
MX10 inetmail21.niedersachsen.de.60
MX10 inetmail12.niedersachsen.de.60
MX10 inetmail11.niedersachsen.de.60
TXT"v=spf1 ip4:80.228.49.0/27 ip4:80.228.54.224/28 ip4:195.37.198.224/28 -all"3600
TXT"2rg86e7godaviguv9708ch6fgv"3600
TXT"MS=ms86835654"3600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: MX (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 1h; resolvers may use either.
    #32
  • ✓ 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