uniklinikum-jena.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
24 passed 1 warning 0 failed 4 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

ukjns3.med.uni-jena.de, ukjns4.med.uni-jena.de, ukjns5.med.uni-jena.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ukjns3.med.uni-jena.de, ukjns4.med.uni-jena.de, ukjns5.med.uni-jena.de
NS in the zone
ukjns3.med.uni-jena.de, ukjns4.med.uni-jena.de, ukjns5.med.uni-jena.de
NameserverAddressesNetwork (AS)Glue
ukjns3.med.uni-jena.de141.35.213.230AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
ukjns4.med.uni-jena.de141.35.213.194 2001:638:909:be:141:35:213:194AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
ukjns5.med.uni-jena.de217.17.196.237 2001:4bd8:42:4242:217:17:196:237AS15725 IKS - IKS Service GmbH, DE AS15725 IKS - IKS Service GmbH, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to ukjns3.med.uni-jena.de, ukjns4.med.uni-jena.de, ukjns5.med.uni-jena.de.
  • ✓ 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.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS15725 (IKS - IKS Service GmbH, DE): 2 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 3 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ukjns3.med.uni-jena.de.
    #13

Nameservers

pass

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ukjns3.med.uni-jena.de 141.35.213.230NOERROR, 13 ms, authoritativenoyes / yesrefused-
ukjns4.med.uni-jena.de 141.35.213.194NOERROR, 13 ms, authoritativenoyes / yesrefused-
ukjns4.med.uni-jena.de 2001:638:909:be:141:35:213:194NOERROR, 13 ms, authoritativenoyes / yesrefused-
ukjns5.med.uni-jena.de 217.17.196.237NOERROR, 19 ms, authoritativenoyes / yesrefused-
ukjns5.med.uni-jena.de 2001:4bd8:42:4242:217:17:196:237NOERROR, 19 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 5 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 2026042903 · primary ukjns3.med.uni-jena.de

Found

Primary (MNAME)
ukjns3.med.uni-jena.de
Contact (RNAME)
as.med.uni-jena.de
Serial
2026042903
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
38400 s

Serial per nameserver

NameserverSerial
ukjns3.med.uni-jena.de (141.35.213.230)2026042903
ukjns4.med.uni-jena.de (141.35.213.194)2026042903
ukjns4.med.uni-jena.de (2001:638:909:be:141:35:213:194)2026042903
ukjns5.med.uni-jena.de (217.17.196.237)2026042903
ukjns5.med.uni-jena.de (2001:4bd8:42:4242:217:17:196:237)2026042903

Checks

  • ✓ Serial 2026042903 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 640m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ukjns3.med.uni-jena.de is one of the listed nameservers.
  • ✓ Contact as@med.uni-jena.de #25
    The SOA RNAME as.med.uni-jena.de means as@med.uni-jena.de.
  • ✓ Date-based serial #26
    The serial 2026042903 follows the YYYYMMDDnn convention (2026-04-29).

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

14 records at the apex

Found

Read from
141.35.213.230:53
TypeValueTTL
SOAukjns3.med.uni-jena.de. as.med.uni-jena.de. 2026042903 10800 3600 604800 3840038400
NSukjns3.med.uni-jena.de.38400
NSukjns5.med.uni-jena.de.38400
NSukjns4.med.uni-jena.de.38400
A141.35.213.147300
AAAA2001:638:909:bc:141:35:213:147300
MX20 mailgate2.med.uni-jena.de.300
MX10 mailgate1.med.uni-jena.de.300
TXT"spf2.0/mfrom +mx ip4:141.35.213.203 ip6:2001:638:909:be:141:35:213:203 ip4:141.35.213.130 ip6:2001:638:909:bc:141:35:213:130 -all"300
TXT"HARICA-j5pDOQJ9a6GJspC9yXD"300
TXT"v=spf1 +mx ip4:141.35.213.203 ip6:2001:638:909:be:141:35:213:203 ip4:141.35.213.130 ip6:2001:638:909:bc:141:35:213:130 -all"300
CAA128 issuewild "harica.gr"300
CAA128 iodef "mailto:ssladmin@klinikum-jena.de"300
CAA128 issue "harica.gr"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 5m, NS 640m. The NS TTL at the parent is 1d and in the zone 640m; 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: harica.gr.