idiv.de

Checked 21 October 2026, 22:51 UTC · via 8.8.8.8
!Passed with warnings
21 passed 1 warning 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

info

dns-3.dfn.de, news.uni-leipzig.de, server2.rz.uni-leipzig.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-3.dfn.de, news.uni-leipzig.de, server2.rz.uni-leipzig.de
NS in the zone
dns-3.dfn.de, news.uni-leipzig.de, server2.rz.uni-leipzig.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-
news.uni-leipzig.de139.18.25.3AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE139.18.25.3
server2.rz.uni-leipzig.de139.18.1.2AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE139.18.1.2

Checks

  • ✓ 3 nameservers #6
    Delegated to dns-3.dfn.de, news.uni-leipzig.de, server2.rz.uni-leipzig.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 3 IPv4 /24s and 1 IPv6 /48.
  • 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: news.uni-leipzig.de, server2.rz.uni-leipzig.de.
    #13

Nameservers

info

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-3.dfn.de 193.174.75.58NOERROR, 10 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 8 ms, authoritativenoyes / yesrefused0
news.uni-leipzig.de 139.18.25.3NOERROR, 18 ms, authoritativenoyes / yesrefused:-) ???
server2.rz.uni-leipzig.de 139.18.1.2NOERROR, 18 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: dns-3.dfn.de: "0"; news.uni-leipzig.de: ":-) ???"; server2.rz.uni-leipzig.de: ":-) ???".
    #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 2026091501 · primary news.uni-leipzig.de

Found

Primary (MNAME)
news.uni-leipzig.de
Contact (RNAME)
domain.uni-leipzig.de
Serial
2026091501
Refresh / retry
21600 s / 3600 s
Expire
2419200 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns-3.dfn.de (193.174.75.58)2026091501
dns-3.dfn.de (2001:638:d:b103::1)2026091501
news.uni-leipzig.de (139.18.25.3)2026091501
server2.rz.uni-leipzig.de (139.18.1.2)2026091501

Checks

  • ✓ Serial 2026091501 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 1h, expire 28d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver news.uni-leipzig.de is one of the listed nameservers.
  • ✓ Contact domain@uni-leipzig.de #25
    The SOA RNAME domain.uni-leipzig.de means domain@uni-leipzig.de.
  • ✓ Date-based serial #26
    The serial 2026091501 follows the YYYYMMDDnn convention (2026-09-15).

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

14 records at the apex

Found

Read from
193.174.75.58:53
TypeValueTTL
SOAnews.uni-leipzig.de. domain.uni-leipzig.de. 2026091501 21600 3600 2419200 8640086400
NSserver2.rz.uni-leipzig.de.86400
NSdns-3.dfn.de.86400
NSnews.uni-leipzig.de.86400
MX10 v3.rz.uni-leipzig.de.86400
MX10 v2.rz.uni-leipzig.de.86400
MX10 v1.rz.uni-leipzig.de.86400
TXT"HARICA-xQtk1HbY0G7R52xz8yo"86400
TXT"HARICA-3B3xFMhv7azzDYiaLCV"86400
TXT"HARICA-KSowV7KusOJeYX22gzp"86400
TXT"HARICA-yxepLivbyPtzKONRWGO"86400
TXT"MS=ms10451901"86400
TXT"HARICA-gIkK0IGoI6kkSgg2CC9"86400
TXT"v=spf1 include:uni-leipzig.de ~all"86400

Checks

  • ✓ TTLs within range #32
    TTLs: 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