mh-freiburg.de

Checked 21 October 2026, 23:22 UTC · via 8.8.8.8
!Passed with warnings
22 passed 3 warnings 0 failed 4 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.mh-freiburg.de, dns1.belwue.de, dns3.belwue.de, dns5.belwue.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns.mh-freiburg.de, dns1.belwue.de, dns3.belwue.de, dns5.belwue.de
NS in the zone
dns.mh-freiburg.de, dns1.belwue.de, dns3.belwue.de, dns5.belwue.de
NameserverAddressesNetwork (AS)Glue
dns.mh-freiburg.de193.197.162.2 2001:7c0:120:3002::53AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE193.197.162.2 2001:7c0:120:3002::53
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.de129.143.4.5 2001:7c0::53:5AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.143.4.5 2001:7c0::53:5

Checks

  • ✓ 4 nameservers #6
    Delegated to dns.mh-freiburg.de, dns1.belwue.de, dns3.belwue.de, dns5.belwue.de.
  • ✓ 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: dns.mh-freiburg.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 4 IPv4 /24s and 2 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS553 (BELWUE - Universitaet Stuttgart, DE): 8 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns.mh-freiburg.de 193.197.162.2NOERROR, 7 ms, authoritativenoyes / yesrefusedno version for you
dns.mh-freiburg.de 2001:7c0:120:3002::53NOERROR, 10 ms, authoritativenoyes / yesrefusedno version for you
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, 8 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)

Checks

  • ✓ All respond #14
    All 8 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 2026101102 · primary dns.mh-freiburg.de

Found

Primary (MNAME)
dns.mh-freiburg.de
Contact (RNAME)
hostmaster.mh-freiburg.de
Serial
2026101102
Refresh / retry
43200 s / 7200 s
Expire
2419200 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
dns.mh-freiburg.de (193.197.162.2)2026101102
dns.mh-freiburg.de (2001:7c0:120:3002::53)2026101102
dns1.belwue.de (129.143.2.10)2026101102
dns1.belwue.de (2001:7c0::53:10)2026101102
dns3.belwue.de (129.143.253.133)2026101102
dns3.belwue.de (2001:7c0:0:253::133)2026101102
dns5.belwue.de (129.143.4.5)2026101102
dns5.belwue.de (2001:7c0::53:5)2026101102

Checks

  • ✓ Serial 2026101102 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 2h, expire 28d, negative TTL 15m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns.mh-freiburg.de is one of the listed nameservers.
  • ✓ Contact hostmaster@mh-freiburg.de #25
    The SOA RNAME hostmaster.mh-freiburg.de means hostmaster@mh-freiburg.de.
  • ✓ Date-based serial #26
    The serial 2026101102 follows the YYYYMMDDnn convention (2026-10-11).

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

warn

19 records at the apex

Found

Read from
193.197.162.2:53
TypeValueTTL
SOAdns.mh-freiburg.de. hostmaster.mh-freiburg.de. 2026101102 43200 7200 2419200 90086400
NSdns1.belwue.de.86400
NSdns.mh-freiburg.de.86400
NSdns5.belwue.de.86400
NSdns3.belwue.de.86400
A193.197.162.43180
MX10 mx4.belwue.de.86400
MX10 mx2.belwue.de.86400
MX10 mx1.belwue.de.86400
MX10 mx3.belwue.de.86400
TXT"google-site-verification=em6Lcfgd0YHO4c_ucIdUe6rxWEtaLsRug6lTRFvzs3I"3600
TXT"Staatliche Hochschule fuer Musik, Mendelssohn-Bartholdy-Platz 1, 79102 Freiburg"3600
TXT"google-site-verification=tGF9GH1pDnuO1d7BnEKDWDDXra20C-Vj7YsidtJBB9U"3600
TXT"v=msv1 t=bd2a0fb662e3439b48d738cf122174"3600
TXT"HARICA-RQ1KWsekeytzhqPgjuz"3600
TXT"apple-domain-verification=aD3FbcrHLzCE2ZbQ"3600
TXT"v=spf1 include:_spf.belwue.de ip4:193.197.162.22/32 ip6:2001:7c0:120:3022::25/128 -all"3600
CAA0 issue "letsencrypt.org"86400
CAA0 issue "harica.gr"86400

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (3m). Low TTLs are useful just before a planned change.
    #32
  • ✓ 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: letsencrypt.org, harica.gr.