zsw-bw.de

Checked 22 October 2026, 01:20 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, melampus.zsw-bw.de

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, melampus.zsw-bw.de
NS in the zone
dns1.belwue.de, dns3.belwue.de, dns5.belwue.de, melampus.zsw-bw.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
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
melampus.zsw-bw.de185.199.204.43AS15404 UNSPECIFIED - COLT Technology Services Group Limited, GB185.199.204.43

Checks

  • ✓ 4 nameservers #6
    Delegated to dns1.belwue.de, dns3.belwue.de, dns5.belwue.de, melampus.zsw-bw.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: melampus.zsw-bw.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
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS15404 (UNSPECIFIED - COLT Technology Services Group Limited, GB): 1 address; AS553 (BELWUE - Universitaet Stuttgart, DE): 6 addresses.
  • 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: melampus.zsw-bw.de.
    #13

Nameservers

warn

7 of 7 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)
melampus.zsw-bw.de 185.199.204.43NOERROR, 53 ms, authoritativenoyes / yesrefusednot currently available

Checks

  • ✓ All respond #14
    All 7 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 2026101201 · primary melampus.zsw-bw.de

Found

Primary (MNAME)
melampus.zsw-bw.de
Contact (RNAME)
dnsadmin.zsw-bw.de
Serial
2026101201
Refresh / retry
32400 s / 3600 s
Expire
2419200 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns1.belwue.de (129.143.2.10)2026101201
dns1.belwue.de (2001:7c0::53:10)2026101201
dns3.belwue.de (129.143.253.133)2026101201
dns3.belwue.de (2001:7c0:0:253::133)2026101201
dns5.belwue.de (129.143.4.5)2026101201
dns5.belwue.de (2001:7c0::53:5)2026101201
melampus.zsw-bw.de (185.199.204.43)2026101201

Checks

  • ✓ Serial 2026101201 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 9h, retry 1h, expire 28d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver melampus.zsw-bw.de is one of the listed nameservers.
  • ✓ Contact dnsadmin@zsw-bw.de #25
    The SOA RNAME dnsadmin.zsw-bw.de means dnsadmin@zsw-bw.de.
  • ✓ Date-based serial #26
    The serial 2026101201 follows the YYYYMMDDnn convention (2026-10-12).

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

15 records at the apex

Found

Read from
129.143.2.10:53
TypeValueTTL
SOAmelampus.zsw-bw.de. dnsadmin.zsw-bw.de. 2026101201 32400 3600 2419200 864003600
NSdns5.belwue.de.3600
NSmelampus.zsw-bw.de.3600
NSdns1.belwue.de.3600
NSdns3.belwue.de.3600
A185.199.204.83600
MX10 ip-rcpt01.zsw-bw.de.3600
MX20 ip-rcpt02.zsw-bw.de.3600
TXT"MS=ms56270371"3600
TXT"v=spf1 mx a:k19921.coveto.de ip4:213.61.249.182 ip4:213.61.249.186 ip4:213.61.249.187 ip4:87.118.104.33 a:mail.opendesk.zsw-bw.de -all"3600
TXT"cisco-ci-domain-verification=70509a0e7e5af25ad6b19ab3f4763e6c8c121487c9665d4ed0552ee1a3a90915"3600
TXT"brevo-code:1973a03a4d1e6c05e62e6ffe3aed88bd"3600
TXT"apple-domain-verification=aHYrBcQt2MGdeHYH"3600
CAA0 issue "swisssign.com"3600
CAA0 issue "letsencrypt.org"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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: swisssign.com, letsencrypt.org.