schlaukopf.de

Checked 22 October 2026, 00:01 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 warnings 0 failed 6 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

warn

ns1.domainoffensive.de, ns2.domainoffensive.de, ns3.domainoffensive.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.domainoffensive.de, ns2.domainoffensive.de, ns3.domainoffensive.de
NS in the zone
ns1.domainoffensive.de, ns2.domainoffensive.eu, ns3.domainoffensive.net
NameserverAddressesNetwork (AS)Glue
ns1.domainoffensive.de192.174.68.21 2001:67c:1bc::21AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns2.domainoffensive.de (parent only)176.97.158.21 2001:67c:10b8::21AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns2.domainoffensive.eu (zone only)176.97.158.21 2001:67c:10b8::21AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns3.domainoffensive.de (parent only)192.174.68.20 2001:67c:1bc::20AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns3.domainoffensive.net (zone only)192.174.68.20 2001:67c:1bc::20AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns1.domainoffensive.de, ns2.domainoffensive.de, ns3.domainoffensive.de.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only at the parent: ns2.domainoffensive.de, ns3.domainoffensive.de; only in the zone: ns2.domainoffensive.eu, ns3.domainoffensive.net. ns1.domainoffensive.de, ns2.domainoffensive.de, ns2.domainoffensive.eu, ns3.domainoffensive.de, ns3.domainoffensive.net report NS ns1.domainoffensive.de ns2.domainoffensive.eu ns3.domainoffensive.net.
    #7
  • ✓ 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.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 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
  • 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

info

10 of 10 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.domainoffensive.de 192.174.68.21NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns1.domainoffensive.de 2001:67c:1bc::21NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns2.domainoffensive.de 176.97.158.21NOERROR, 11 ms, authoritativenoyes / yesrefusedreg-wie1
ns2.domainoffensive.de 2001:67c:10b8::21NOERROR, 12 ms, authoritativenoyes / yesrefusedreg-wie1
ns2.domainoffensive.eu 176.97.158.21NOERROR, 12 ms, authoritativenoyes / yesrefusedreg-wie1
ns2.domainoffensive.eu 2001:67c:10b8::21NOERROR, 12 ms, authoritativenoyes / yesrefusedreg-wie1
ns3.domainoffensive.de 192.174.68.20NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns3.domainoffensive.de 2001:67c:1bc::20NOERROR, 5 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns3.domainoffensive.net 192.174.68.20NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns3.domainoffensive.net 2001:67c:1bc::20NOERROR, 5 ms, authoritativenoyes / yesrefusedRcodeZero DNS

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: ns1.domainoffensive.de: "RcodeZero DNS"; ns2.domainoffensive.de: "reg-wie1"; ns2.domainoffensive.eu: "reg-wie1"; ns3.domainoffensive.de: "RcodeZero DNS"; ns3.domainoffensive.net: "RcodeZero DNS".
    #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 1787963098 · primary ns1.domainoffensive.de

Found

Primary (MNAME)
ns1.domainoffensive.de
Contact (RNAME)
info.domains.resellerinterface.de
Serial
1787963098
Refresh / retry
14400 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns1.domainoffensive.de (192.174.68.21)1787963098
ns1.domainoffensive.de (2001:67c:1bc::21)1787963098
ns2.domainoffensive.de (176.97.158.21)1787963098
ns2.domainoffensive.de (2001:67c:10b8::21)1787963098
ns2.domainoffensive.eu (176.97.158.21)1787963098
ns2.domainoffensive.eu (2001:67c:10b8::21)1787963098
ns3.domainoffensive.de (192.174.68.20)1787963098
ns3.domainoffensive.de (2001:67c:1bc::20)1787963098
ns3.domainoffensive.net (192.174.68.20)1787963098
ns3.domainoffensive.net (2001:67c:1bc::20)1787963098

Checks

  • ✓ Serial 1787963098 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.domainoffensive.de is one of the listed nameservers.
  • ✓ Contact info@domains.resellerinterface.de #25
    The SOA RNAME info.domains.resellerinterface.de means info@domains.resellerinterface.de.
  • ✓ Timestamp serial #26
    The serial 1787963098 is a Unix timestamp (2026-08-29 00:24 UTC).

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

8 records at the apex

Found

Read from
192.174.68.21:53
TypeValueTTL
SOAns1.domainoffensive.de. info.domains.resellerinterface.de. 1787963098 14400 3600 604800 8640086400
NSns1.domainoffensive.de.86400
NSns2.domainoffensive.eu.86400
NSns3.domainoffensive.net.86400
A195.201.104.14714400
MX10 mail.schlaukopf.de.14400
TXT"google-site-verification=jmPk4vAnxLK12PI1xGGL1Xudb8gH2NX3k5UQjlViwCw"14400
TXT"v=spf1 a mx ptr ip4:195.201.104.147 ip6:2a01:4f8:13a:eb::2 a:schlaukopf.de -all"14400

Checks

  • ✓ TTLs within range #32
    TTLs: A 4h, MX 4h, 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