th-owl.de

Checked 22 October 2026, 00:40 UTC · via 8.8.8.8
!Passed with warnings
24 passed 1 warning 0 failed 8 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

manul.noc.th-owl.de, serval.noc.th-owl.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
manul.noc.th-owl.de, serval.noc.th-owl.de
NS in the zone
manul.noc.th-owl.de, serval.noc.th-owl.de
NameserverAddressesNetwork (AS)Glue
manul.noc.th-owl.de193.174.118.77 2001:638:505:102::77AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE193.174.118.77 2001:638:505:102::77
serval.noc.th-owl.de131.234.194.196 2001:638:502:994::196AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE131.234.194.196 2001:638:502:994::196

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: manul.noc.th-owl.de, serval.noc.th-owl.de.
    #6
  • ✓ 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: manul.noc.th-owl.de, serval.noc.th-owl.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 2 IPv4 /24s and 2 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., 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
manul.noc.th-owl.de 193.174.118.77NOERROR, 11 ms, authoritativenoyes / yesrefused-
manul.noc.th-owl.de 2001:638:505:102::77NOERROR, 11 ms, authoritativenoyes / yesrefused-
serval.noc.th-owl.de 131.234.194.196NOERROR, 12 ms, authoritativenoyes / yesrefused-
serval.noc.th-owl.de 2001:638:502:994::196NOERROR, 12 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

warn

serial 810974898 · primary leopard.noc.th-owl.de

Found

Primary (MNAME)
leopard.noc.th-owl.de
Contact (RNAME)
hostmaster.th-owl.de
Serial
810974898
Refresh / retry
7200 s / 7200 s
Expire
1209600 s
Negative TTL
10800 s

Serial per nameserver

NameserverSerial
manul.noc.th-owl.de (193.174.118.77)810974898
manul.noc.th-owl.de (2001:638:505:102::77)810974898
serval.noc.th-owl.de (131.234.194.196)810974898
serval.noc.th-owl.de (2001:638:502:994::196)810974898

Checks

  • ✓ Serial 810974898 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    retry 2h should be shorter than refresh 2h. Current values: refresh 2h, retry 2h, expire 14d, negative TTL 3h.
    #23
  • i
    Hidden master
    The primary nameserver leopard.noc.th-owl.de is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact hostmaster@th-owl.de #25
    The SOA RNAME hostmaster.th-owl.de means hostmaster@th-owl.de.
  • ✓ Counter serial #26
    The serial 810974898 is a plain counter.

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC
Signatures valid until
30 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
15514RSASHA256 (8)SHA256 0EDF269CD2527681…yes

DNSKEY in the zone

Key tagRoleAlgorithm
15514KSK (257)RSASHA256 (8)
14544ZSK (256)RSASHA256 (8)

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • ✓ DS matches a key #28
    The DS record at the parent matches a key in the zone: key tag 15514 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: RSASHA256 (8).
  • ✓ Signatures valid until 2026-10-30 #30
    The earliest DNSKEY/SOA signature expires at 2026-10-30 11:13 UTC.
  • i
    NSEC
    The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.
    #31

Records

info

18 records at the apex

Found

Read from
193.174.118.77:53
TypeValueTTL
SOAleopard.noc.th-owl.de. hostmaster.th-owl.de. 810974898 7200 7200 1209600 1080086400
NSserval.noc.th-owl.de.86400
NSmanul.noc.th-owl.de.86400
A193.174.116.15186400
AAAA2001:638:505:101::cafe:babe86400
MX10 a1731.mx.srv.dfn.de.86400
MX10 c1731.mx.srv.dfn.de.86400
MX10 b1731.mx.srv.dfn.de.86400
TXT"v=spf1 include:_spf.o173.mx.srv.dfn.de -all"86400
TXT"sophos-domain-verification=b07985b92bb34d0b817500e7524956488df9e8fb61d77368d3f16eb8dc79f07f"86400
TXT"apple-domain-verification=HKpBsYGEj34JCkP9"86400
TXT"MS=ms40537692"86400
TXT"_telesec-domain-validation=339323_2024-10-21_VV9CksVraHiEukg7bjiKB7cPac1ndRhFv0LOjiUNadwv7WAjDH"86400
TXT"spycloud-domain-verification=d74504c6-3fde-40d4-a40f-3d24d5f357c1"86400
TXT"google-site-verification=MWJVrq3XHV4cXgRjHuAJTQBN7u4BmI5SvZfCrRrjw0Y"86400
TXT"HARICA-DAXXd5a9V7YS4s28lvb"86400
TXT"openai-domain-verification=dv-TMlWulJRfdl6dKz1w4tF3uhq"86400
TXT"cisco-ci-domain-verification=5ac22ec6a4af637ba81e41c70e83021c329c2aac903cef0a5d33eec0105d0689"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, AAAA 1d, MX 1d, NS 1d.
  • ✓ 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