buecherhallen.de

Checked 21 October 2026, 22:00 UTC · via 8.8.8.8
!Passed with warnings
23 passed 2 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

info

dns1.wtnet.de, dns2.wtnet.de, dns3.wtnet.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.wtnet.de, dns2.wtnet.de, dns3.wtnet.de
NS in the zone
dns1.wtnet.de, dns2.wtnet.de, dns3.wtnet.de
NameserverAddressesNetwork (AS)Glue
dns1.wtnet.de213.209.102.3 2a02:2028:d000::3AS15943 WTNET-AS - wilhelm.tel GmbH, DE AS15943 WTNET-AS - wilhelm.tel GmbH, DE213.209.102.3 2a02:2028:d000::3
dns2.wtnet.de213.209.102.4 2a02:2028:d000::4AS15943 WTNET-AS - wilhelm.tel GmbH, DE AS15943 WTNET-AS - wilhelm.tel GmbH, DE213.209.102.4 2a02:2028:d000::4
dns3.wtnet.de87.253.174.18 2a00:ea8:8112::2AS9211 WORK-AS - Nawork Internet Informationssysteme GmbH, DE AS9211 WORK-AS - Nawork Internet Informationssysteme GmbH, DE87.253.174.18 2a00:ea8:8112::2

Checks

  • ✓ 3 nameservers #6
    Delegated to dns1.wtnet.de, dns2.wtnet.de, dns3.wtnet.de.
  • ✓ 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.
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 2 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS15943 (WTNET-AS - wilhelm.tel GmbH, DE): 4 addresses; AS9211 (WORK-AS - Nawork Internet Informationssysteme GmbH, DE): 2 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.wtnet.de 213.209.102.3NOERROR, 12 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.6.0 (built Jan 24 2022 14:04:55 by root@4f5f9a7469a8)
dns1.wtnet.de 2a02:2028:d000::3NOERROR, 12 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.6.0 (built Jan 24 2022 14:04:55 by root@4f5f9a7469a8)
dns2.wtnet.de 213.209.102.4NOERROR, 10 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.6.0 (built Jan 24 2022 14:04:55 by root@4f5f9a7469a8)
dns2.wtnet.de 2a02:2028:d000::4NOERROR, 10 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.6.0 (built Jan 24 2022 14:04:55 by root@4f5f9a7469a8)
dns3.wtnet.de 87.253.174.18NOERROR, 10 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.6.0 (built Jan 24 2022 14:04:55 by root@4f5f9a7469a8)
dns3.wtnet.de 2a00:ea8:8112::2NOERROR, 10 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.6.0 (built Jan 24 2022 14:04:55 by root@4f5f9a7469a8)

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.wtnet.de: "PowerDNS Authoritative Server 4.6.0 (built Jan 24 2022 14:04:55 by root@4f5f9a7469a8)"; dns2.wtnet.de: "PowerDNS Authoritative Server 4.6.0 (built Jan 24 2022 14:04:55 by root@4f5f9a7469a8)"; dns3.wtnet.de: "PowerDNS Authoritative Server 4.6.0 (built Jan 24 2022 14:04:55 by root@4f5f9a7469a8)". 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 2026030601 · primary dns1.wtnet.de

Found

Primary (MNAME)
dns1.wtnet.de
Contact (RNAME)
hostmaster.wtnet.de
Serial
2026030601
Refresh / retry
3600 s / 900 s
Expire
3600000 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
dns1.wtnet.de (213.209.102.3)2026030601
dns1.wtnet.de (2a02:2028:d000::3)2026030601
dns2.wtnet.de (213.209.102.4)2026030601
dns2.wtnet.de (2a02:2028:d000::4)2026030601
dns3.wtnet.de (87.253.174.18)2026030601
dns3.wtnet.de (2a00:ea8:8112::2)2026030601

Checks

  • ✓ Serial 2026030601 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 15m, expire 1000h, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns1.wtnet.de is one of the listed nameservers.
  • ✓ Contact hostmaster@wtnet.de #25
    The SOA RNAME hostmaster.wtnet.de means hostmaster@wtnet.de.
  • ✓ Date-based serial #26
    The serial 2026030601 follows the YYYYMMDDnn convention (2026-03-06).

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

14 records at the apex

Found

Read from
213.209.102.3:53
TypeValueTTL
SOAdns1.wtnet.de. hostmaster.wtnet.de. 2026030601 3600 900 3600000 600600
NSdns2.wtnet.de.600
NSdns1.wtnet.de.600
NSdns3.wtnet.de.600
A85.13.150.252600
MX10 mail.buecherhallen.de.600
TXT"j8jkmq188ob9euqof017iadhu8"172800
TXT"MS=C6726A0692394E0104FFE9CF57FFD79AD6B3CF83"172800
TXT"atlassian-domain-verification=NYrnecaK6fBL6sXKtY0DheA5KmOf94Jifhn409pd6qStb0A3rdruXrLAjgw2a33y"600
TXT"v=spf1 a mx a:v1359214.kasserver.com a:dd33702.kasserver.com ip4:85.13.156.232 ~all"172800
TXT"adobe-idp-site-verification=79b01acb08ea83938f3fbdd1df739ae01e40c94f37ea9697146e3da831436187"600
TXT"apple-domain-verification=v89YTIaIP91UX19K"172800
TXT"cisco-ci-domain-verification=4b8a851baf00bcf433c1b4813040286f10eee823946d24ab8f63c149fc31b4fa"600
TXT"google-site-verification=QH1SYng6CkKs8pJJwQmaIrLCMLBncOU236Dwx19ESJQ"172800

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 10m, NS 10m. The NS TTL at the parent is 1d and in the zone 10m; 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