uni-wh.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 warnings 0 failed 6 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

dmz6.uni-wh.de, dns-3.dfn.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dmz6.uni-wh.de, dns-3.dfn.de
NS in the zone
dmz6.uni-wh.de, dns-3.dfn.de
NameserverAddressesNetwork (AS)Glue
dmz6.uni-wh.de193.175.243.110AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE193.175.243.110
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-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: dmz6.uni-wh.de, dns-3.dfn.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: dmz6.uni-wh.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 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): 3 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: dmz6.uni-wh.de.
    #13

Nameservers

warn

3 of 3 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dmz6.uni-wh.de 193.175.243.110NOERROR, 13 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.9.16 (built Jun 10 2026 12:58:38 by root@localhost)
dns-3.dfn.de 193.174.75.58NOERROR, 8 ms, authoritativenoyes / yesrefused0
dns-3.dfn.de 2001:638:d:b103::1NOERROR, 8 ms, authoritativenoyes / yesrefused0

Checks

  • ✓ All respond #14
    All 3 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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: dmz6.uni-wh.de: "PowerDNS Authoritative Server 4.9.16 (built Jun 10 2026 12:58:38 by root@localhost)". Hide or replace the version string.
    #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 2026100701 · primary dmz6.uni-wh.de

Found

Primary (MNAME)
dmz6.uni-wh.de
Contact (RNAME)
hostmaster.uni-wh.de
Serial
2026100701
Refresh / retry
14400 s / 3600 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dmz6.uni-wh.de (193.175.243.110)2026100701
dns-3.dfn.de (193.174.75.58)2026100701
dns-3.dfn.de (2001:638:d:b103::1)2026100701

Checks

  • ✓ Serial 2026100701 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dmz6.uni-wh.de is one of the listed nameservers.
  • ✓ Contact hostmaster@uni-wh.de #25
    The SOA RNAME hostmaster.uni-wh.de means hostmaster@uni-wh.de.
  • ✓ Date-based serial #26
    The serial 2026100701 follows the YYYYMMDDnn convention (2026-10-07).

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
193.175.243.110:53
TypeValueTTL
SOAdmz6.uni-wh.de. hostmaster.uni-wh.de. 2026100701 14400 3600 1209600 864003600
NSdmz6.uni-wh.de.3600
NSdns-3.dfn.de.3600
A193.175.243.813600
MX10 dnsmail2.uni-wh.de.3600
TXT"MS=FB40EF0FE0B59D2ABD85E91570E31C7639C0EEED"3600
TXT"brevo-code:08a6512e3fe96421d6a8dd1e31a6a000"3600
TXT"adobe-idp-site-verification=a0b6ae54b9b24ffb7577c7647213c5ce20c0da9e464e9993a548d1f675a96f02"3600
TXT"brevo-code:f4844c955fd773fcebc0403fd54cd457"3600
TXT"v=spf1 mx ip4:188.40.171.224 ip4:193.175.243.64/26 ip4:77.237.55.139 include:spf.brevo.com include:spf.bevent.eu include:amazonses.com include:spf1.meap.de include:spf.protection.outlook.com include:newsmailservice.de ~all"3600
TXT"https://help.brevo.com/hc/en-us/articles/12163873383186"3600
CAA0 issue "pki.dfn.de"3600
CAA0 issue "harica.gr"3600
CAA0 issue "letsencrypt.org"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 1h, NS 1h. The NS TTL at the parent is 1d and in the zone 1h; 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: pki.dfn.de, harica.gr, letsencrypt.org.