nerdculture.de

Checked 21 October 2026, 23:31 UTC · via 8.8.8.8
!Passed with warnings
29 passed 1 warning 0 failed 3 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

ns.windfluechter.net, ns1.ownisp.de, ns2.ownisp.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.windfluechter.net, ns1.ownisp.de, ns2.ownisp.de
NS in the zone
ns.windfluechter.net, ns1.ownisp.de, ns2.ownisp.de
NameserverAddressesNetwork (AS)Glue
ns.windfluechter.net31.172.31.194 2a01:a700:4629::194:1AS50629 LWLCOM - LWLcom GmbH, DE AS50629 LWLCOM - LWLcom GmbH, DE-
ns1.ownisp.de45.136.28.245 2a03:4000:49:230:34da:3bff:fef6:6a52AS197540 netcup-AS - netcup GmbH, DE AS197540 netcup-AS - netcup GmbH, DE-
ns2.ownisp.de152.89.93.249AS39519 MYLOC-ENTERPRISE - WIIT AG, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns.windfluechter.net, ns1.ownisp.de, ns2.ownisp.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 3 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS197540 (netcup-AS - netcup GmbH, DE): 2 addresses; AS39519 (MYLOC-ENTERPRISE - WIIT AG, DE): 1 address; AS50629 (LWLCOM - LWLcom GmbH, DE): 2 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns2.ownisp.de.
    #13

Nameservers

warn

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.windfluechter.net 31.172.31.194NOERROR, 9 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 5.1.5 (built Oct 7 2026 06:13:02 by root@localhost)
ns.windfluechter.net 2a01:a700:4629::194:1NOERROR, 9 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 5.1.5 (built Oct 7 2026 06:13:02 by root@localhost)
ns1.ownisp.de 45.136.28.245NOERROR, 0 ms, authoritativenoyes / yesrefused-
ns1.ownisp.de 2a03:4000:49:230:34da:3bff:fef6:6a52NOERROR, 1 ms, authoritativenoyes / yesrefused-
ns2.ownisp.de 152.89.93.249NOERROR, 7 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 5 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: ns.windfluechter.net: "PowerDNS Authoritative Server 5.1.5 (built Oct 7 2026 06:13:02 by root@localhost)". 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 2026101302 · primary ns.windfluechter.net

Found

Primary (MNAME)
ns.windfluechter.net
Contact (RNAME)
hostmaster.nerdculture.de
Serial
2026101302
Refresh / retry
10800 s / 1800 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns.windfluechter.net (31.172.31.194)2026101302
ns.windfluechter.net (2a01:a700:4629::194:1)2026101302
ns1.ownisp.de (45.136.28.245)2026101302
ns1.ownisp.de (2a03:4000:49:230:34da:3bff:fef6:6a52)2026101302
ns2.ownisp.de (152.89.93.249)2026101302

Checks

  • ✓ Serial 2026101302 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 30m, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.windfluechter.net is one of the listed nameservers.
  • ✓ Contact hostmaster@nerdculture.de #25
    The SOA RNAME hostmaster.nerdculture.de means hostmaster@nerdculture.de.
  • ✓ Date-based serial #26
    The serial 2026101302 follows the YYYYMMDDnn convention (2026-10-13).

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
0 iterations, 0-byte salt
Signatures valid until
29 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
60619ECDSAP256SHA256 (13)SHA256 F6FA9D38755F80D3…yes

DNSKEY in the zone

Key tagRoleAlgorithm
60619KSK (257)ECDSAP256SHA256 (13)

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • ✓ DS matches a key #28
    The DS record at the parent matches a key in the zone: key tag 60619 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-10-29 #30
    The earliest DNSKEY/SOA signature expires at 2026-10-29 00:00 UTC.
  • ✓ NSEC3 as recommended #31
    The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

pass

11 records at the apex

Found

Read from
31.172.31.194:53
TypeValueTTL
SOAns.windfluechter.net. hostmaster.nerdculture.de. 2026101302 10800 1800 1209600 36001800
NSns.windfluechter.net.1800
NSns1.ownisp.de.1800
NSns2.ownisp.de.1800
A31.172.31.2501800
AAAA2a01:a700:4629::250:11800
MX20 mail2.windfluechter.net.1800
MX20 mail1.windfluechter.net.1800
MX10 mailgw.windfluechter.net.1800
TXT"v=spf1 a mx ip4:31.172.31.193/26 ip6:2a01:a700:4629::/48 -all"1800
CAA0 issuewild "letsencrypt.org"1800

Checks

  • ✓ TTLs within range #32
    TTLs: A 30m, AAAA 30m, MX 30m, NS 30m. The NS TTL at the parent is 1d and in the zone 30m; 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: letsencrypt.org.