hdm-stuttgart.de

Checked 21 October 2026, 22:42 UTC · via 8.8.8.8
!Passed with warnings
19 passed 2 warnings 0 failed 8 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

dns1.belwue.de, dns3.belwue.de, iz-net-6.hdm-stuttgart.de, iz-net-7.hdm-stuttgart.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.belwue.de, dns3.belwue.de, iz-net-6.hdm-stuttgart.de, iz-net-7.hdm-stuttgart.de
NS in the zone
dns1.belwue.de, dns3.belwue.de, iz-net-6.hdm-stuttgart.de, iz-net-7.hdm-stuttgart.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
iz-net-6.hdm-stuttgart.de141.62.16.5AS553 BELWUE - Universitaet Stuttgart, DE141.62.16.5
iz-net-7.hdm-stuttgart.de141.62.16.7AS553 BELWUE - Universitaet Stuttgart, DE141.62.16.7

Checks

  • ✓ 4 nameservers #6
    Delegated to dns1.belwue.de, dns3.belwue.de, iz-net-6.hdm-stuttgart.de, iz-net-7.hdm-stuttgart.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: iz-net-6.hdm-stuttgart.de, iz-net-7.hdm-stuttgart.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): 6 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: iz-net-6.hdm-stuttgart.de, iz-net-7.hdm-stuttgart.de.
    #13

Nameservers

warn

6 of 6 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)
iz-net-6.hdm-stuttgart.de 141.62.16.5NOERROR, 7 ms, authoritativenoyes / yesrefused9.18.24-1-Debian
iz-net-7.hdm-stuttgart.de 141.62.16.7NOERROR, 7 ms, authoritativenoyes / yesrefused9.18.24-1-Debian

Checks

  • ✓ All respond #14
    All 6 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)"; iz-net-6.hdm-stuttgart.de: "9.18.24-1-Debian"; iz-net-7.hdm-stuttgart.de: "9.18.24-1-Debian". 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

info

serial 1792587968 · primary iz-dns-master.hdm-stuttgart.de

Found

Primary (MNAME)
iz-dns-master.hdm-stuttgart.de
Contact (RNAME)
hostmaster.hdm-stuttgart.de
Serial
1792587968
Refresh / retry
3600 s / 1800 s
Expire
3600000 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
dns1.belwue.de (129.143.2.10)1792587968
dns1.belwue.de (2001:7c0::53:10)1792587968
dns3.belwue.de (129.143.253.133)1792587968
dns3.belwue.de (2001:7c0:0:253::133)1792587968
iz-net-6.hdm-stuttgart.de (141.62.16.5)1792587968
iz-net-7.hdm-stuttgart.de (141.62.16.7)1792587968

Checks

  • ✓ Serial 1792587968 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 30m, expire 1000h, negative TTL 30m.
  • i
    Hidden master
    The primary nameserver iz-dns-master.hdm-stuttgart.de is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact hostmaster@hdm-stuttgart.de #25
    The SOA RNAME hostmaster.hdm-stuttgart.de means hostmaster@hdm-stuttgart.de.
  • ✓ Timestamp serial #26
    The serial 1792587968 is a Unix timestamp (2026-10-21 13:06 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

16 records at the apex

Found

Read from
129.143.2.10:53
TypeValueTTL
SOAiz-dns-master.hdm-stuttgart.de. hostmaster.hdm-stuttgart.de. 1792587968 3600 1800 3600000 18003600
NSdns1.belwue.de.3600
NSiz-net-6.hdm-stuttgart.de.3600
NSiz-net-7.hdm-stuttgart.de.3600
NSdns3.belwue.de.3600
A212.132.79.373600
MX10 mx3.hdm-stuttgart.de.3600
MX10 mx2.hdm-stuttgart.de.3600
MX10 mx1.hdm-stuttgart.de.3600
MX10 mx4.hdm-stuttgart.de.3600
TXT"adobe-idp-site-verification=8254295e90102b7231ae689e2525aa1297c0ed46387c77cdfdc83a09b541fc25"3600
TXT"v=spf1 ip4:141.62.0.0/17 a:mail.sop-at.com ~all"3600
TXT"MS=ms68245545"3600
TXT"MS=4D8CCE6D6DEBD009CE86C2DC4FF46F9DA7FCD028"3600
TXT"google-site-verification=TLPmcwLZdD-o2s7oMbSPHDaIptrQ-BxpIQV6IHVq62o"3600
TXT"HARICA-n8AsGG2Ubp3cDZhNCvT"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