immanuel.de

Checked 21 October 2026, 22:52 UTC · via 8.8.8.8
!Passed with warnings
18 passed 2 warnings 0 failed 9 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.cbxnet.de, ns3.cbxnet.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.cbxnet.de, ns3.cbxnet.de
NS in the zone
ns1.cbxnet.de, ns3.cbxnet.de
NameserverAddressesNetwork (AS)Glue
ns1.cbxnet.de212.87.33.1AS12512 CBXNET - CBXNET combox internet GmbH, DE212.87.33.1
ns3.cbxnet.de213.191.33.253AS12512 CBXNET - CBXNET combox internet GmbH, DE213.191.33.253

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.cbxnet.de, ns3.cbxnet.de.
    #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 0 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS12512 (CBXNET - CBXNET combox internet GmbH, DE): 2 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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

info

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.cbxnet.de 212.87.33.1NOERROR, 13 ms, authoritativenoyes / yesrefuseddont ask a lady for her age
ns3.cbxnet.de 213.191.33.253NOERROR, 19 ms, authoritativenoyes / yesrefuseddont ask a lady for her age

Checks

  • ✓ All respond #14
    All 2 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.cbxnet.de: "dont ask a lady for her age"; ns3.cbxnet.de: "dont ask a lady for her age".
    #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

info

serial 2026082002 · primary ns1.combox.de

Found

Primary (MNAME)
ns1.combox.de
Contact (RNAME)
postmaster.combox.de
Serial
2026082002
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
ns1.cbxnet.de (212.87.33.1)2026082002
ns3.cbxnet.de (213.191.33.253)2026082002

Checks

  • ✓ Serial 2026082002 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 10m.
  • i
    Hidden master
    The primary nameserver ns1.combox.de is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact postmaster@combox.de #25
    The SOA RNAME postmaster.combox.de means postmaster@combox.de.
  • ✓ Date-based serial #26
    The serial 2026082002 follows the YYYYMMDDnn convention (2026-08-20).

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

9 records at the apex

Found

Read from
212.87.33.1:53
TypeValueTTL
SOAns1.combox.de. postmaster.combox.de. 2026082002 28800 7200 604800 600600
NSns1.cbxnet.de.600
NSns3.cbxnet.de.600
A212.87.36.136600
MX180 mavas3.cbxnet.de.600
MX190 mavas2.cbxnet.de.600
TXT"v=spf1 mx ip4:212.87.36.133/32 ip4:212.87.32.182/32 ip4:80.190.129.128/25 ip4:212.87.33.16/32 ip4:212.87.33.25/32 ip4:213.191.41.0/24 ip4:212.87.45.145/32 include:_spf.senders.scnem.com -all"60
TXT"_6s6f224ejpu48r5otfwgfg7r441h6ys"60
TXT"google-site-verification=13aS13dTPO9gx2rmSaWj-3y302Hz3M9G9_IdQlJ-x1U"60

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.
  • 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