villingen-schwenningen.de

Checked 22 October 2026, 00:51 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

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.belwue.de, dns3.belwue.de
NS in the zone
dns1.belwue.de, dns3.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

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: dns1.belwue.de, dns3.belwue.de.
    #6
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ No glue needed #8
    All nameservers are outside the zone, so no glue records are needed.
  • ✓ 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): 4 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

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.belwue.de 129.143.2.10NOERROR, 8 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, 8 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, 8 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)

Checks

  • ✓ All respond #14
    All 4 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)". 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 2026100801 · primary iserver.villingen-schwenningen.de

Found

Primary (MNAME)
iserver.villingen-schwenningen.de
Contact (RNAME)
reser.villingen-schwenningen.de
Serial
2026100801
Refresh / retry
21600 s / 1800 s
Expire
2419200 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns1.belwue.de (129.143.2.10)2026100801
dns1.belwue.de (2001:7c0::53:10)2026100801
dns3.belwue.de (129.143.253.133)2026100801
dns3.belwue.de (2001:7c0:0:253::133)2026100801

Checks

  • ✓ Serial 2026100801 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 30m, expire 28d, negative TTL 1d.
  • i
    Hidden master
    The primary nameserver iserver.villingen-schwenningen.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 reser@villingen-schwenningen.de #25
    The SOA RNAME reser.villingen-schwenningen.de means reser@villingen-schwenningen.de.
  • ✓ Date-based serial #26
    The serial 2026100801 follows the YYYYMMDDnn convention (2026-10-08).

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
SOAiserver.villingen-schwenningen.de. reser.villingen-schwenningen.de. 2026100801 21600 1800 2419200 8640086400
NSdns1.belwue.de.86400
NSdns3.belwue.de.86400
A185.237.65.17186400
MX10 mx8.kvnbw.de.600
MX10 mx6.kvnbw.de.600
MX10 mx7.kvnbw.de.600
MX10 mx9.kvnbw.de.600
TXT"v=spf1 a mx ip4:129.143.24.0/28 ip4:129.143.24.64/27 ip4:109.123.254.204/32 include:agenturserver.de include:spf.protect.kvnbw.de include:spf.crsend.com include:spf.de.umantis.com ~all"86400
TXT"vF78SNVmh0SPo6R8"86400
TXT"jetbrains-domain-verification=8ganyyb7vj0sbtnw83af4wc0n"86400
TXT"202208160732541b18a56l6l4his4c6xer24el08w4b7u1d13lc1qp1lk0m89x82"86400
TXT"google-site-verification=nVFrnrVAEkjvH8KtSCHbWObgU0RgscaXFB6fD4gO9DM"86400
TXT"Stadt Villingen-Schwenningen, Muensterplatz 7/8, 78050 Villingen-Schwenningen"86400
TXT"apple-domain-verification=wq2qOoLFSbPmBZXk"86400
TXT"autodesk-domain-verification=dXRFz233giiy2gTQP-rO"86400
TXT"facebook-domain-verification=1k0imsbtc7g8xrnzcpqhnf0w325g72"86400
TXT"MS=C22DD6A30F4E08914BC409BBC723A966D39C188B"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 10m, 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