htwg-konstanz.de

Checked 21 October 2026, 22:51 UTC · via 8.8.8.8
!Passed with warnings
19 passed 3 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

dns1.belwue.de, dns3.belwue.de, noc.htwg-konstanz.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.belwue.de, dns3.belwue.de, noc.htwg-konstanz.de
NS in the zone
dns1.belwue.de, dns3.belwue.de, dns5.belwue.de
NameserverAddressesNetwork (AS)Glue
dns1.belwue.de129.143.2.10 2001:7c0::53:10AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.143.2.10 2001:7c0::53:10
dns3.belwue.de129.143.253.133 2001:7c0:0:253::133AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.143.253.133 2001:7c0:0:253::133
dns5.belwue.de (zone only)129.143.4.5 2001:7c0::53:5AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE-
noc.htwg-konstanz.de (parent only)141.37.218.10AS553 BELWUE - Universitaet Stuttgart, DE141.37.218.10

Checks

  • ✓ 3 nameservers #6
    Delegated to dns1.belwue.de, dns3.belwue.de, noc.htwg-konstanz.de.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only at the parent: noc.htwg-konstanz.de; only in the zone: dns5.belwue.de. dns1.belwue.de, dns3.belwue.de, dns5.belwue.de, noc.htwg-konstanz.de report NS dns1.belwue.de dns3.belwue.de dns5.belwue.de.
    #7
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: noc.htwg-konstanz.de.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • i
    One address family in one network
    all IPv6 addresses are in 2001:7c0::/48, while the other address family is spread over several networks.
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS553 (BELWUE - Universitaet Stuttgart, 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: noc.htwg-konstanz.de.
    #13

Nameservers

warn

7 of 7 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.belwue.de 129.143.2.10NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns1.belwue.de 2001:7c0::53:10NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns3.belwue.de 129.143.253.133NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns3.belwue.de 2001:7c0:0:253::133NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns5.belwue.de 129.143.4.5NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
dns5.belwue.de 2001:7c0::53:5NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)
noc.htwg-konstanz.de 141.37.218.10NOERROR, 13 ms, authoritativenoyes / yesrefusednamed service

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: dns1.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)"; dns3.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)"; dns5.belwue.de: "PowerDNS Authoritative Server 4.5.5 (built Dec 8 2022 18:24:18 by root@a309361b6303)". 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 1792579506 · primary noc.htwg-konstanz.de

Found

Primary (MNAME)
noc.htwg-konstanz.de
Contact (RNAME)
hostmaster.htwg-konstanz.de
Serial
1792579506
Refresh / retry
21600 s / 1800 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns1.belwue.de (129.143.2.10)1792579506
dns1.belwue.de (2001:7c0::53:10)1792579506
dns3.belwue.de (129.143.253.133)1792579506
dns3.belwue.de (2001:7c0:0:253::133)1792579506
dns5.belwue.de (129.143.4.5)1792579506
dns5.belwue.de (2001:7c0::53:5)1792579506
noc.htwg-konstanz.de (141.37.218.10)1792579506

Checks

  • ✓ Serial 1792579506 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 30m, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver noc.htwg-konstanz.de is one of the listed nameservers.
  • ✓ Contact hostmaster@htwg-konstanz.de #25
    The SOA RNAME hostmaster.htwg-konstanz.de means hostmaster@htwg-konstanz.de.
  • ✓ Timestamp serial #26
    The serial 1792579506 is a Unix timestamp (2026-10-21 10:45 UTC).

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

18 records at the apex

Found

Read from
129.143.2.10:53
TypeValueTTL
SOAnoc.htwg-konstanz.de. hostmaster.htwg-konstanz.de. 1792579506 21600 1800 1209600 8640043200
NSdns3.belwue.de.43200
NSdns1.belwue.de.43200
NSdns5.belwue.de.43200
MX10 mx2.belwue.de.600
MX10 mx1.belwue.de.600
MX10 mx4.belwue.de.600
MX10 mx3.belwue.de.600
TXT"facebook-domain-verification=que4m0wmjmrgn3mctc456daj1katkh"43200
TXT"google-site-verification=hpOaLn_sZbX1PoiHP6gV2jUXDKS-IgmZJvg0YHXW6eA"43200
TXT"google-site-verification=tzbTJOmOB6D1_zYSdoVABe90nS3bl1c5eFf4NyG8Idc"43200
TXT"MS=E5A4ADCA9C287CF8D711292ED9A9DD433ABE8E7C"43200
TXT"adobe-idp-site-verification=f018100546d6275f54781ff70ab5e39c1b5f9c0455e0ec570591a5012fb62dfc"43200
TXT"v=spf1 a:smtp-mx.htwg-konstanz.de ip4:141.37.11.132 ip4:141.37.20.64 ip6:2001:7c0:5f0:f020::20:64 ip4:193.196.22.246 a:mail.ibs-bw.de include:spfa.myconvento.com ?all"43200
TXT"anthropic-domain-verification-v0rhjy=eGM0zEQbg5BBZx8G40YTtv6AV"43200
TXT"HARICA-PFzEjMR2pg0AorLJkUR"43200
TXT"google-gws-recovery-domain-verification=57083902"43200
TXT"cisco-ci-domain-verification=5bd487679b27bca5fed154366ae04ac2c672bb97219012b686a738aedfc72cbf"43200

Checks

  • ✓ TTLs within range #32
    TTLs: MX 10m, NS 12h. The NS TTL at the parent is 1d and in the zone 12h; 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