uni-jena.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
23 passed 1 warning 0 failed 5 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

dns-3.dfn.de, dns-extern-01.uni-jena.de, dns-extern-02.uni-jena.de, dns-extern-03.uni-jena.de, dns-extern-04.uni-jena.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-3.dfn.de, dns-extern-01.uni-jena.de, dns-extern-02.uni-jena.de, dns-extern-03.uni-jena.de, dns-extern-04.uni-jena.de
NS in the zone
dns-3.dfn.de, dns-extern-01.uni-jena.de, dns-extern-02.uni-jena.de, dns-extern-03.uni-jena.de, dns-extern-04.uni-jena.de
NameserverAddressesNetwork (AS)Glue
dns-3.dfn.de193.174.75.58 2001:638:d:b103::1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
dns-extern-01.uni-jena.de141.35.104.106 2001:638:1558:2368::106AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.35.104.106 2001:638:1558:2368::106
dns-extern-02.uni-jena.de141.35.105.106 2001:638:1558:2369::106AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.35.105.106 2001:638:1558:2369::106
dns-extern-03.uni-jena.de141.24.186.53AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.24.186.53
dns-extern-04.uni-jena.de85.214.170.45 2a01:238:424b:4700:a29e:2d8d:e2f:779cAS6724 STRATO - Strato GmbH, DE AS6724 STRATO - Strato GmbH, DE85.214.170.45 2a01:238:424b:4700:a29e:2d8d:e2f:779c

Checks

  • ✓ 5 nameservers #6
    Delegated to dns-3.dfn.de, dns-extern-01.uni-jena.de, dns-extern-02.uni-jena.de, dns-extern-03.uni-jena.de, dns-extern-04.uni-jena.de.
  • ✓ 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: dns-extern-01.uni-jena.de, dns-extern-02.uni-jena.de, dns-extern-03.uni-jena.de, dns-extern-04.uni-jena.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 5 IPv4 /24s and 3 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS6724 (STRATO - Strato GmbH, DE): 2 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 7 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: dns-extern-03.uni-jena.de.
    #13

Nameservers

info

9 of 9 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-3.dfn.de 193.174.75.58NOERROR, 8 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 10 ms, authoritativenoyes / yesrefused0
dns-extern-01.uni-jena.de 141.35.104.106NOERROR, 12 ms, authoritativenoyes / yesrefusednone
dns-extern-01.uni-jena.de 2001:638:1558:2368::106NOERROR, 13 ms, authoritativenoyes / yesrefusednone
dns-extern-02.uni-jena.de 141.35.105.106NOERROR, 12 ms, authoritativenoyes / yesrefusednone
dns-extern-02.uni-jena.de 2001:638:1558:2369::106NOERROR, 15 ms, authoritativenoyes / yesrefusednone
dns-extern-03.uni-jena.de 141.24.186.53NOERROR, 9 ms, authoritativenoyes / yesrefusednone
dns-extern-04.uni-jena.de 85.214.170.45NOERROR, 13 ms, authoritativenoyes / yesrefusednone
dns-extern-04.uni-jena.de 2a01:238:424b:4700:a29e:2d8d:e2f:779cNOERROR, 16 ms, authoritativenoyes / yesrefusednone

Checks

  • ✓ All respond #14
    All 9 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: dns-3.dfn.de: "0"; dns-extern-01.uni-jena.de: "none"; dns-extern-02.uni-jena.de: "none"; dns-extern-03.uni-jena.de: "none"; dns-extern-04.uni-jena.de: "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

pass

serial 2026102104 · primary dns-extern-01.uni-jena.de

Found

Primary (MNAME)
dns-extern-01.uni-jena.de
Contact (RNAME)
hostmaster.uni-jena.de
Serial
2026102104
Refresh / retry
21600 s / 3600 s
Expire
3600000 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns-3.dfn.de (193.174.75.58)2026102104
dns-3.dfn.de (2001:638:d:b103::1)2026102104
dns-extern-01.uni-jena.de (141.35.104.106)2026102104
dns-extern-01.uni-jena.de (2001:638:1558:2368::106)2026102104
dns-extern-02.uni-jena.de (141.35.105.106)2026102104
dns-extern-02.uni-jena.de (2001:638:1558:2369::106)2026102104
dns-extern-03.uni-jena.de (141.24.186.53)2026102104
dns-extern-04.uni-jena.de (85.214.170.45)2026102104
dns-extern-04.uni-jena.de (2a01:238:424b:4700:a29e:2d8d:e2f:779c)2026102104

Checks

  • ✓ Serial 2026102104 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 1h, expire 1000h, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns-extern-01.uni-jena.de is one of the listed nameservers.
  • ✓ Contact hostmaster@uni-jena.de #25
    The SOA RNAME hostmaster.uni-jena.de means hostmaster@uni-jena.de.
  • ✓ Date-based serial #26
    The serial 2026102104 follows the YYYYMMDDnn convention (2026-10-21).

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

27 records at the apex

Found

Read from
193.174.75.58:53
TypeValueTTL
SOAdns-extern-01.uni-jena.de. hostmaster.uni-jena.de. 2026102104 21600 3600 3600000 8640086400
NSdns-extern-04.uni-jena.de.86400
NSdns-3.dfn.de.86400
NSdns-extern-01.uni-jena.de.86400
NSdns-extern-02.uni-jena.de.86400
NSdns-extern-03.uni-jena.de.86400
A141.35.104.7986400
A141.35.105.7986400
AAAA2001:638:1558:2368::1:7986400
AAAA2001:638:1558:2369::1:7986400
MX10 b2391.mx.srv.dfn.de.86400
MX10 a2391.mx.srv.dfn.de.86400
MX10 c2391.mx.srv.dfn.de.86400
TXT"ZOOM_verify_ISgAa3fbSISCkbnrZZxIwA"180
TXT"apple-domain-verification=egleZAuGPyUpz6CJ"180
TXT"v=spf1 redirect=_spf.uni-jena.de"180
TXT"google-site-verification=Ts7DD_cYpmvdflghA-o_ZnTuCqd3t_WYj7ctvFabA3c"180
TXT"MS=ms71787841"180
TXT"cisco-ci-domain-verification=4b6f1608e2541c2dc34d5924b417fed99296ab43d4101db5f5733b4dc9b99dd4"180
TXT"MS=ms39581131"180
TXT"google-site-verification=CRj7Yv1VpC4pSNOMDfh1iAke8KslbjTIl6vbewIjwSk"180
TXT"adobe-idp-site-verification=7d871a98ab167d376db08c29f1a70063739f85f3a970df38e77380cedabb569d"180
CAA0 issue "harica.gr"86400
CAA0 issue "letsencrypt.org"86400
CAA0 issue "pki.dfn.de"86400
CAA0 issuewild ";"86400
CAA0 iodef "mailto:certadmin@uni-jena.de"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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: harica.gr, letsencrypt.org, pki.dfn.de, none (issuance forbidden).