tu-ilmenau.de

Checked 22 October 2026, 00:41 UTC · via 8.8.8.8
!Passed with warnings
20 passed 2 warnings 0 failed 7 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

deneb.dfn.de, dns-extern-slave.uni-jena.de, floyd.rz.tu-ilmenau.de, prakinf2.prakinf.tu-ilmenau.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
deneb.dfn.de, dns-extern-slave.uni-jena.de, floyd.rz.tu-ilmenau.de, prakinf2.prakinf.tu-ilmenau.de
NS in the zone
deneb.dfn.de, dns-extern-slave.uni-jena.de, floyd.rz.tu-ilmenau.de, prakinf2.prakinf.tu-ilmenau.de
NameserverAddressesNetwork (AS)Glue
deneb.dfn.de192.76.176.9 2001:638:800:1::9AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
dns-extern-slave.uni-jena.de141.35.104.10 2001:638:1558:2368::10AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
floyd.rz.tu-ilmenau.de141.24.4.1AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.24.4.1
prakinf2.prakinf.tu-ilmenau.de141.24.12.2 2001:638:904:1020::2AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE141.24.12.2

Checks

  • ✓ 4 nameservers #6
    Delegated to deneb.dfn.de, dns-extern-slave.uni-jena.de, floyd.rz.tu-ilmenau.de, prakinf2.prakinf.tu-ilmenau.de.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • !
    Glue differs from the zone
    The addresses at the parent (glue) differ from the addresses in the zone: prakinf2.prakinf.tu-ilmenau.de (glue 141.24.12.2, zone 141.24.12.2, 2001:638:904:1020::2). Update the glue at your registrar.
    #8
  • ✓ 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 4 IPv4 /24s and 3 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): 7 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: floyd.rz.tu-ilmenau.de.
    #13

Nameservers

info

7 of 7 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
deneb.dfn.de 192.76.176.9NOERROR, 14 ms, authoritativenoyes / yesrefused0
deneb.dfn.de 2001:638:800:1::9NOERROR, 14 ms, authoritativenoyes / yesrefused0
dns-extern-slave.uni-jena.de 141.35.104.10NOERROR, 12 ms, authoritativenoyes / yesrefusednone
dns-extern-slave.uni-jena.de 2001:638:1558:2368::10NOERROR, 13 ms, authoritativenoyes / yesrefusednone
floyd.rz.tu-ilmenau.de 141.24.4.1NOERROR, 9 ms, authoritativenoyes / yesrefused-
prakinf2.prakinf.tu-ilmenau.de 141.24.12.2NOERROR, 8 ms, authoritativenoyes / yesrefused-
prakinf2.prakinf.tu-ilmenau.de 2001:638:904:1020::2NOERROR, 14 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 7 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: deneb.dfn.de: "0"; dns-extern-slave.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 2026102105 · primary prakinf2.prakinf.tu-ilmenau.de

Found

Primary (MNAME)
prakinf2.prakinf.tu-ilmenau.de
Contact (RNAME)
hostmaster.tu-ilmenau.de
Serial
2026102105
Refresh / retry
14400 s / 3600 s
Expire
604800 s
Negative TTL
14400 s

Serial per nameserver

NameserverSerial
deneb.dfn.de (192.76.176.9)2026102105
deneb.dfn.de (2001:638:800:1::9)2026102105
dns-extern-slave.uni-jena.de (141.35.104.10)2026102105
dns-extern-slave.uni-jena.de (2001:638:1558:2368::10)2026102105
floyd.rz.tu-ilmenau.de (141.24.4.1)2026102105
prakinf2.prakinf.tu-ilmenau.de (141.24.12.2)2026102105
prakinf2.prakinf.tu-ilmenau.de (2001:638:904:1020::2)2026102105

Checks

  • ✓ Serial 2026102105 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 7d, negative TTL 4h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver prakinf2.prakinf.tu-ilmenau.de is one of the listed nameservers.
  • ✓ Contact hostmaster@tu-ilmenau.de #25
    The SOA RNAME hostmaster.tu-ilmenau.de means hostmaster@tu-ilmenau.de.
  • ✓ Date-based serial #26
    The serial 2026102105 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

info

19 records at the apex

Found

Read from
192.76.176.9:53
TypeValueTTL
SOAprakinf2.prakinf.tu-ilmenau.de. hostmaster.tu-ilmenau.de. 2026102105 14400 3600 604800 1440014400
NSdeneb.dfn.de.14400
NSprakinf2.prakinf.tu-ilmenau.de.14400
NSfloyd.rz.tu-ilmenau.de.14400
NSdns-extern-slave.uni-jena.de.14400
A141.24.186.18114400
MX100 mail.tu-ilmenau.de.14400
MX10 c2221.mx.srv.dfn.de.14400
MX10 a2221.mx.srv.dfn.de.14400
MX10 b2221.mx.srv.dfn.de.14400
MX100 mail-router2.rz.tu-ilmenau.de.14400
MX100 mail-router1.rz.tu-ilmenau.de.14400
TXT"cisco-ci-domain-verification=74d908dff728ba14a7326912a0ef7dcb58fd87c4ac2804552547420913f66a29"14400
TXT"google-site-verification=G-Jxch177DdGmTe-xe9qxoWlsJTamlIMaoGhAfm3W-c"14400
TXT"autodesk-domain-verification=dS6MS6XHof-zKh9xZSw1"14400
TXT"adobe-idp-site-verification=7d871a98ab167d376db08c29f1a70063739f85f3a970df38e77380cedabb569d"14400
TXT"MS=ms53291016"14400
TXT"atlassian-domain-verification=8FyrEAzFUrTUxxtoeU7Zw9MIAoqLLwyKUK80xTFJ48tOau0q36ipYVVak94VEh5c"14400
TXT"v=spf1 ip4:141.24.0.0/16 ip6:2001:638:904::/48 mx include:gbv.de -all"14400

Checks

  • ✓ TTLs within range #32
    TTLs: A 4h, MX 4h, NS 4h. The NS TTL at the parent is 1d and in the zone 4h; 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.
  • 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