hft-stuttgart.de

Checked 21 October 2026, 22:50 UTC · via 8.8.8.8
!Passed with warnings
22 passed 2 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

info

dns1.belwue.de, dns3.belwue.de, dns5.belwue.de, ns1.hft-stuttgart.de, ns2.hft-stuttgart.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.belwue.de, dns3.belwue.de, dns5.belwue.de, ns1.hft-stuttgart.de, ns2.hft-stuttgart.net
NS in the zone
dns1.belwue.de, dns3.belwue.de, dns5.belwue.de, ns1.hft-stuttgart.de, ns2.hft-stuttgart.net
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.de129.143.4.5 2001:7c0::53:5AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE129.143.4.5 2001:7c0::53:5
ns1.hft-stuttgart.de193.197.232.10 2001:7c0:720:232::10AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE193.197.232.10 2001:7c0:720:232::10
ns2.hft-stuttgart.net193.197.232.14 2001:7c0:720:232::14AS553 BELWUE - Universitaet Stuttgart, DE AS553 BELWUE - Universitaet Stuttgart, DE-

Checks

  • ✓ 5 nameservers #6
    Delegated to dns1.belwue.de, dns3.belwue.de, dns5.belwue.de, ns1.hft-stuttgart.de, ns2.hft-stuttgart.net.
  • ✓ 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: ns1.hft-stuttgart.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): 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
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • ✓ 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)
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)
ns1.hft-stuttgart.de 193.197.232.10NOERROR, 8 ms, authoritativenoyes / yesrefused9.18.19
ns1.hft-stuttgart.de 2001:7c0:720:232::10NOERROR, 8 ms, authoritativenoyes / yesrefused9.18.19
ns2.hft-stuttgart.net 193.197.232.14NOERROR, 7 ms, authoritativenoyes / yesrefused9.18.19
ns2.hft-stuttgart.net 2001:7c0:720:232::14NOERROR, 8 ms, authoritativenoyes / yesrefused9.18.19

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)"; 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)"; ns1.hft-stuttgart.de: "9.18.19"; ns2.hft-stuttgart.net: "9.18.19". 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 2026101304 · primary dns6.hft-stuttgart.de

Found

Primary (MNAME)
dns6.hft-stuttgart.de
Contact (RNAME)
datacenter.hft-stuttgart.de
Serial
2026101304
Refresh / retry
3600 s / 1800 s
Expire
2419200 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns1.belwue.de (129.143.2.10)2026101304
dns1.belwue.de (2001:7c0::53:10)2026101304
dns3.belwue.de (129.143.253.133)2026101304
dns3.belwue.de (2001:7c0:0:253::133)2026101304
dns5.belwue.de (129.143.4.5)2026101304
dns5.belwue.de (2001:7c0::53:5)2026101304
ns1.hft-stuttgart.de (193.197.232.10)2026101304
ns1.hft-stuttgart.de (2001:7c0:720:232::10)2026101304
ns2.hft-stuttgart.net (193.197.232.14)2026101304
ns2.hft-stuttgart.net (2001:7c0:720:232::14)2026101304

Checks

  • ✓ Serial 2026101304 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 30m, expire 28d, negative TTL 1d.
  • i
    Hidden master
    The primary nameserver dns6.hft-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 datacenter@hft-stuttgart.de #25
    The SOA RNAME datacenter.hft-stuttgart.de means datacenter@hft-stuttgart.de.
  • ✓ Date-based serial #26
    The serial 2026101304 follows the YYYYMMDDnn convention (2026-10-13).

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
SOAdns6.hft-stuttgart.de. datacenter.hft-stuttgart.de. 2026101304 3600 1800 2419200 8640086400
NSdns1.belwue.de.86400
NSns2.hft-stuttgart.net.86400
NSdns5.belwue.de.86400
NSdns3.belwue.de.86400
NSns1.hft-stuttgart.de.86400
A193.197.232.109300
MX10 smtpin01.hft-stuttgart.de.86400
MX20 smtpin02.hft-stuttgart.de.86400
TXT"MS=788E78B84951CB04A5469003F154E67B7B1E315D"86400
TXT"l7ciTnHHU0t6XvXNhha6zzU/pzs8G1UBFfVkkqyMi59jqnFwtYG1NVlSE3C0FawhLXCdYvyx3Azs7eZ+A2E7aQ=="86400
TXT"google-site-verification=3bZ2uUVmcES_f0P607uFgffwKfvne9dNY3tD6GQoyk0"86400
TXT"atlassian-domain-verification=5F5mUh0GV3Mh1OE4OFgVSsrfCWfXK548URm/kG8GQCkHIzqnTFSOY1aXwRzAk3/D"86400
TXT"google-site-verification=41YpJhCTpR1MkbcmF2nMhF2dKcTocxSOjE0GM8T5yDI"86400
TXT"google-site-verification=GD7PCWM6yat40uZhfE4hlrclRBW2nD33-YzL7QA-gNE"86400
TXT"HARICA-zZkPnLVhoCXbzPiEgc2"86400
TXT"v=spf1 ip4:193.196.136.0/24 ip4:193.197.232.26/32 ip4:193.197.232.27/32 include:spf.protection.outlook.com -all"86400
TXT"zone-ownership-verification-da959ffc449b46433f039a8e73efd13b51048579448d57288c92847b07a6f3df"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 1d, 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.
  • 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