one-4-u.de

Checked 21 October 2026, 23:41 UTC · via 8.8.8.8
!Passed with warnings
20 passed 1 warning 0 failed 8 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

dns31.cloudns.net, dns32.cloudns.net, dns33.cloudns.net, dns34.cloudns.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns31.cloudns.net, dns32.cloudns.net, dns33.cloudns.net, dns34.cloudns.net
NS in the zone
dns31.cloudns.net, dns32.cloudns.net, dns33.cloudns.net, dns34.cloudns.net
NameserverAddressesNetwork (AS)Glue
dns31.cloudns.net185.136.96.100 2a06:fb00:1::1:100AS203391 CLOUDNSNET - Cloud DNS Ltd, BG AS203391 CLOUDNSNET - Cloud DNS Ltd, BG-
dns32.cloudns.net185.136.97.100 2a06:fb00:1::2:100AS203391 CLOUDNSNET - Cloud DNS Ltd, BG AS203391 CLOUDNSNET - Cloud DNS Ltd, BG-
dns33.cloudns.net185.136.98.100 2a06:fb00:1::3:100AS203391 CLOUDNSNET - Cloud DNS Ltd, BG AS203391 CLOUDNSNET - Cloud DNS Ltd, BG-
dns34.cloudns.net185.136.99.100 2a06:fb00:1::4:100AS203391 CLOUDNSNET - Cloud DNS Ltd, BG AS203391 CLOUDNSNET - Cloud DNS Ltd, BG-

Checks

  • ✓ 4 nameservers #6
    Delegated to dns31.cloudns.net, dns32.cloudns.net, dns33.cloudns.net, dns34.cloudns.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.
  • i
    One address family in one network
    all IPv6 addresses are in 2a06:fb00:1::/48, while the other address family is spread over several networks.
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS203391 (CLOUDNSNET - Cloud DNS Ltd, BG): 8 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 .net
    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

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns31.cloudns.net 185.136.96.100NOERROR, 4 ms, authoritativenoyes / yesrefusedde3-6
dns31.cloudns.net 2a06:fb00:1::1:100NOERROR, 4 ms, authoritativenoyes / yesrefusedde3-6
dns32.cloudns.net 185.136.97.100NOERROR, 3 ms, authoritativenoyes / yesrefusedde3-6
dns32.cloudns.net 2a06:fb00:1::2:100NOERROR, 7 ms, authoritativenoyes / yesrefusedde3-6
dns33.cloudns.net 185.136.98.100NOERROR, 3 ms, authoritativenoyes / yesrefusedde3-6
dns33.cloudns.net 2a06:fb00:1::3:100NOERROR, 5 ms, authoritativenoyes / yesrefusedde3-6
dns34.cloudns.net 185.136.99.100NOERROR, 4 ms, authoritativenoyes / yesrefusedde3-6
dns34.cloudns.net 2a06:fb00:1::4:100NOERROR, 4 ms, authoritativenoyes / yesrefusedde3-6

Checks

  • ✓ All respond #14
    All 8 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: dns31.cloudns.net: "de3-6"; dns32.cloudns.net: "de3-6"; dns33.cloudns.net: "de3-6"; dns34.cloudns.net: "de3-6".
    #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 2026082905 · primary dns31.cloudns.net

Found

Primary (MNAME)
dns31.cloudns.net
Contact (RNAME)
support.problemloeser.de
Serial
2026082905
Refresh / retry
7200 s / 1800 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dns31.cloudns.net (185.136.96.100)2026082905
dns31.cloudns.net (2a06:fb00:1::1:100)2026082905
dns32.cloudns.net (185.136.97.100)2026082905
dns32.cloudns.net (2a06:fb00:1::2:100)2026082905
dns33.cloudns.net (185.136.98.100)2026082905
dns33.cloudns.net (2a06:fb00:1::3:100)2026082905
dns34.cloudns.net (185.136.99.100)2026082905
dns34.cloudns.net (2a06:fb00:1::4:100)2026082905

Checks

  • ✓ Serial 2026082905 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, retry 30m, expire 14d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns31.cloudns.net is one of the listed nameservers.
  • ✓ Contact support@problemloeser.de #25
    The SOA RNAME support.problemloeser.de means support@problemloeser.de.
  • ✓ Date-based serial #26
    The serial 2026082905 follows the YYYYMMDDnn convention (2026-08-29).

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
185.136.96.100:53
TypeValueTTL
SOAdns31.cloudns.net. support.problemloeser.de. 2026082905 7200 1800 1209600 36003600
NSdns34.cloudns.net.3600
NSdns33.cloudns.net.3600
NSdns31.cloudns.net.3600
NSdns32.cloudns.net.3600
A46.20.34.563600
MX10 bwisp1.bwrez.de.3600
TXT"v=spf1 mx -all"3600

Checks

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