klicksafe.de

Checked 21 October 2026, 23:10 UTC · via 8.8.8.8
!Passed with warnings
25 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

info

ns1.domainoffensive.de, ns2.domainoffensive.eu, ns3.domainoffensive.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.domainoffensive.de, ns2.domainoffensive.eu, ns3.domainoffensive.net
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.eu176.97.158.21 2001:67c:10b8::21AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns3.domainoffensive.net192.174.68.20 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.eu, ns3.domainoffensive.net.
  • ✓ 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.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 6 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 3 TLDs #12
    Nameserver names use the TLDs .de, .eu, .net.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.domainoffensive.de 192.174.68.21NOERROR, 5 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns1.domainoffensive.de 2001:67c:1bc::21NOERROR, 5 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns2.domainoffensive.eu 176.97.158.21NOERROR, 12 ms, authoritativenoyes / yesrefusedreg-wie1
ns2.domainoffensive.eu 2001:67c:10b8::21NOERROR, 13 ms, authoritativenoyes / yesrefusedreg-wie1
ns3.domainoffensive.net 192.174.68.20NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns3.domainoffensive.net 2001:67c:1bc::20NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS

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.
  • 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.eu: "reg-wie1"; 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

warn

serial 1792580772 · primary ns1.domainoffensive.de

Found

Primary (MNAME)
ns1.domainoffensive.de
Contact (RNAME)
info.domains.resellerinterface.de
Serial
1792580772
Refresh / retry
14400 s / 3600 s
Expire
604800 s
Negative TTL
120 s

Serial per nameserver

NameserverSerial
ns1.domainoffensive.de (192.174.68.21)1792580772
ns1.domainoffensive.de (2001:67c:1bc::21)1792580772
ns2.domainoffensive.eu (176.97.158.21)1792580772
ns2.domainoffensive.eu (2001:67c:10b8::21)1792580772
ns3.domainoffensive.net (192.174.68.20)1792580772
ns3.domainoffensive.net (2001:67c:1bc::20)1792580772

Checks

  • ✓ Serial 1792580772 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    negative caching TTL (minimum) 2m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 4h, retry 1h, expire 7d, negative TTL 2m.
    #23
  • ✓ 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 1792580772 is a Unix timestamp (2026-10-21 11:06 UTC).

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
5939ECDSAP256SHA256 (13)SHA256 59E2BA9E6EB3A8A7…yes

DNSKEY in the zone

Key tagRoleAlgorithm
48066ZSK (256)ECDSAP256SHA256 (13)
5939KSK (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 5939 (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

warn

10 records at the apex

Found

Read from
192.174.68.21:53
TypeValueTTL
SOAns1.domainoffensive.de. info.domains.resellerinterface.de. 1792580772 14400 3600 604800 12086400
NSns1.domainoffensive.de.86400
NSns2.domainoffensive.eu.86400
NSns3.domainoffensive.net.86400
A92.205.193.35120
AAAA2a00:116a:100:3ac0::120
MX0 mxlb.ispgateway.de.3600
TXT"51v10ufu3egnbslou64mfgr962"120
TXT"v=spf1 a mx include:ispgateway.de ~all"120
TXT"google-site-verification=f5ODnsban_Ny4VBns7yW0nns4Pq8zveJD_nZAYrlz2U"120

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (2m), AAAA (2m). Low TTLs are useful just before a planned change.
    #32
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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