rbk-direkt.de

Checked 22 October 2026, 00:00 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

info

ns01.ondns.de, ns02.ondns.eu

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns01.ondns.de, ns02.ondns.eu
NS in the zone
ns01.ondns.de, ns02.ondns.eu
NameserverAddressesNetwork (AS)Glue
ns01.ondns.de192.174.68.108 2001:67c:1bc::108AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT192.174.68.108 2001:67c:1bc::108
ns02.ondns.eu176.97.158.108 2001:67c:10b8::108AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns01.ondns.de, ns02.ondns.eu.
    #6
  • ✓ 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): 4 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 2 TLDs #12
    Nameserver names use the TLDs .de, .eu.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns01.ondns.de 192.174.68.108NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns01.ondns.de 2001:67c:1bc::108NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns02.ondns.eu 176.97.158.108NOERROR, 13 ms, authoritativenoyes / yesrefusedreg-wie1
ns02.ondns.eu 2001:67c:10b8::108NOERROR, 13 ms, authoritativenoyes / yesrefusedreg-wie1

Checks

  • ✓ All respond #14
    All 4 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: ns01.ondns.de: "RcodeZero DNS"; ns02.ondns.eu: "reg-wie1".
    #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 2026091404 · primary ns01.ondns.de

Found

Primary (MNAME)
ns01.ondns.de
Contact (RNAME)
dns-admin.oevermann.de
Serial
2026091404
Refresh / retry
28800 s / 7200 s
Expire
2419200 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns01.ondns.de (192.174.68.108)2026091404
ns01.ondns.de (2001:67c:1bc::108)2026091404
ns02.ondns.eu (176.97.158.108)2026091404
ns02.ondns.eu (2001:67c:10b8::108)2026091404

Checks

  • ✓ Serial 2026091404 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 28d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns01.ondns.de is one of the listed nameservers.
  • ✓ Contact dns-admin@oevermann.de #25
    The SOA RNAME dns-admin.oevermann.de means dns-admin@oevermann.de.
  • ✓ Date-based serial #26
    The serial 2026091404 follows the YYYYMMDDnn convention (2026-09-14).

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

warn

9 records at the apex

Found

Read from
192.174.68.108:53
TypeValueTTL
SOAns01.ondns.de. dns-admin.oevermann.de. 2026091404 28800 7200 2419200 360086400
NSns01.ondns.de.86400
NSns02.ondns.eu.86400
A83.138.60.47240
MX10 mx01.oevermann.de.14400
MX20 mx03.oevermann.de.14400
TXT"v=spf1 mx a include:_spf.on.services ~all"3600
TXT"13b17e86d569bf73c7bc32d7efe5c98c7ffee2bc09b718d93c184459a2a9af4"3600
TXT"fb9748a5fb6458a94e7ebd84ba019d2fd5cecb570b341e20c157696bf4c5371"3600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (4m). Low TTLs are useful just before a planned change.
    #32
  • ✓ 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