hochschule-biberach.de

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

warn

dns1.belwue.de, dns1.hochschule-bc.de, dns3.belwue.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.belwue.de, dns1.hochschule-bc.de, dns3.belwue.de
NS in the zone
dns1.belwue.de, dns1.hochschule-bc.de, dns2.hochschule-bc.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
dns1.hochschule-bc.de193.196.3.3 2001:7c0:b00:9082::53:1AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE193.196.3.3 2001:7c0:b00:1030::11
dns2.hochschule-bc.de (zone only)193.196.2.4 2001:7c0:b00:9081::53:2AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE-
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-

Checks

  • ✓ 3 nameservers #6
    Delegated to dns1.belwue.de, dns1.hochschule-bc.de, dns3.belwue.de.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only in the zone: dns2.hochschule-bc.de, dns5.belwue.de. dns1.belwue.de, dns1.hochschule-bc.de, dns2.hochschule-bc.de, dns3.belwue.de, dns5.belwue.de report NS dns1.belwue.de dns1.hochschule-bc.de dns2.hochschule-bc.de dns3.belwue.de dns5.belwue.de.
    #7
  • !
    Glue differs from the zone
    The addresses at the parent (glue) differ from the addresses in the zone: dns1.hochschule-bc.de (glue 193.196.3.3, 2001:7c0:b00:1030::11, zone 193.196.3.3, 2001:7c0:b00:9082::53:1). 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 5 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): 10 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

10 of 10 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)
dns1.hochschule-bc.de 193.196.3.3NOERROR, 10 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.24.04.8-Ubuntu
dns1.hochschule-bc.de 2001:7c0:b00:9082::53:1NOERROR, 10 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.24.04.8-Ubuntu
dns2.hochschule-bc.de 193.196.2.4NOERROR, 226 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.24.04.7-Ubuntu
dns2.hochschule-bc.de 2001:7c0:b00:9081::53:2NOERROR, 165 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.24.04.7-Ubuntu
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)

Checks

  • ✓ All respond #14
    All 10 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)"; dns1.hochschule-bc.de: "9.18.39-0ubuntu0.24.04.8-Ubuntu"; dns2.hochschule-bc.de: "9.18.39-0ubuntu0.24.04.7-Ubuntu"; 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 2026102100 · primary dns1.hochschule-bc.de

Found

Primary (MNAME)
dns1.hochschule-bc.de
Contact (RNAME)
hostmaster.hochschule-bc.de
Serial
2026102100
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns1.belwue.de (129.143.2.10)2026102100
dns1.belwue.de (2001:7c0::53:10)2026102100
dns1.hochschule-bc.de (193.196.3.3)2026102100
dns1.hochschule-bc.de (2001:7c0:b00:9082::53:1)2026102100
dns2.hochschule-bc.de (193.196.2.4)2026102100
dns2.hochschule-bc.de (2001:7c0:b00:9081::53:2)2026102100
dns3.belwue.de (129.143.253.133)2026102100
dns3.belwue.de (2001:7c0:0:253::133)2026102100
dns5.belwue.de (129.143.4.5)2026102100
dns5.belwue.de (2001:7c0::53:5)2026102100

Checks

  • ✓ Serial 2026102100 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns1.hochschule-bc.de is one of the listed nameservers.
  • ✓ Contact hostmaster@hochschule-bc.de #25
    The SOA RNAME hostmaster.hochschule-bc.de means hostmaster@hochschule-bc.de.
  • ✓ Date-based serial #26
    The serial 2026102100 follows the YYYYMMDDnn convention (2026-10-21).

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

17 records at the apex

Found

Read from
129.143.2.10:53
TypeValueTTL
SOAdns1.hochschule-bc.de. hostmaster.hochschule-bc.de. 2026102100 28800 7200 604800 8640086400
NSdns3.belwue.de.86400
NSdns1.belwue.de.86400
NSdns2.hochschule-bc.de.86400
NSdns1.hochschule-bc.de.86400
NSdns5.belwue.de.86400
A193.197.112.8086400
MX10 b3231.mx.srv.dfn.de.300
MX10 c3231.mx.srv.dfn.de.300
MX10 a3231.mx.srv.dfn.de.300
TXT"Hochschule Biberach, Karlstr. 9-11, 88400 Biberach, Germany"86400
TXT"google-site-verification=6ja1svylZmp801m1P8OTzU96kx3d3nHZfgNr8N5XRg4"86400
TXT"v=spf1 mx ip4:193.196.2.90 ip4:193.196.2.91 ip4:193.196.2.92 ip4:134.103.140.2/32 a:mail.hochschule-bc.de include:_spf.belwue.de include:spf.sendinblue.com -all exp=_spf.hochschule-biberach.de"86400
TXT"facebook-domain-verification=x26qkvtph3ymw4pjsybf648cobr5d0"86400
CAA0 iodef "mailto:ra@hochschule-bc.de"86400
CAA0 issue "harica.gr"86400
CAA0 issuewild "harica.gr"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 5m, 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: harica.gr.