hochschulkompass.de

Checked 21 October 2026, 22:50 UTC · via 8.8.8.8
!Passed with warnings
20 passed 4 warnings 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

warn

ns1.x-dot.de, ns2.x-dot.de, ns3.xdot.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.x-dot.de, ns2.x-dot.de, ns3.xdot.de
NS in the zone
ns1.x-dot.de, ns2.x-dot.de, ns3.xdot.de
NameserverAddressesNetwork (AS)Glue
ns1.x-dot.de159.255.168.253AS8881 VERSATEL - 1&1 Versatel GmbH, DE159.255.168.253
ns2.x-dot.de159.255.169.253AS8881 VERSATEL - 1&1 Versatel GmbH, DE159.255.169.253
ns3.xdot.de159.255.170.5AS8881 VERSATEL - 1&1 Versatel GmbH, DE35.157.179.121

Checks

  • ✓ 3 nameservers #6
    Delegated to ns1.x-dot.de, ns2.x-dot.de, ns3.xdot.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: ns3.xdot.de (glue 35.157.179.121, zone 159.255.170.5). 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 3 IPv4 /24s and 0 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS8881 (VERSATEL - 1&1 Versatel GmbH, 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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

warn

3 of 3 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.x-dot.de 159.255.168.253NOERROR, 21 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:11:11 by root@1efc37074878)
ns2.x-dot.de 159.255.169.253NOERROR, 21 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:11:11 by root@1efc37074878)
ns3.xdot.de 159.255.170.5NOERROR, 21 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:11:11 by root@1efc37074878)

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: ns1.x-dot.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:11:11 by root@1efc37074878)"; ns2.x-dot.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:11:11 by root@1efc37074878)"; ns3.xdot.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:11:11 by root@1efc37074878)". 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 2026100802 · primary ns1.x-dot.de

Found

Primary (MNAME)
ns1.x-dot.de
Contact (RNAME)
hostmaster.hochschulkompass.de
Serial
2026100802
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns1.x-dot.de (159.255.168.253)2026100802
ns2.x-dot.de (159.255.169.253)2026100802
ns3.xdot.de (159.255.170.5)2026100802

Checks

  • ✓ Serial 2026100802 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.x-dot.de is one of the listed nameservers.
  • ✓ Contact hostmaster@hochschulkompass.de #25
    The SOA RNAME hostmaster.hochschulkompass.de means hostmaster@hochschulkompass.de.
  • ✓ Date-based serial #26
    The serial 2026100802 follows the YYYYMMDDnn convention (2026-10-08).

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

6 records at the apex

Found

Read from
159.255.168.253:53
TypeValueTTL
SOAns1.x-dot.de. hostmaster.hochschulkompass.de. 2026100802 10800 3600 604800 36003600
NSns3.xdot.de.3600
NSns1.x-dot.de.3600
NSns2.x-dot.de.3600
A185.132.24.2273600
MX10 hochschulkompass-de.mail.protection.outlook.com.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.
  • 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