suizidprophylaxe.de

Checked 22 October 2026, 00:31 UTC · via 8.8.8.8
✗Problems found
21 passed 2 warnings 1 failed 5 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

aragorn.data-horizon.de, gandalf.data-horizon.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
aragorn.data-horizon.de, gandalf.data-horizon.net
NS in the zone
aragorn.data-horizon.de, gandalf.data-horizon.net
NameserverAddressesNetwork (AS)Glue
aragorn.data-horizon.de148.251.12.23 2a01:4f8:201:7124::2AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE-
gandalf.data-horizon.net167.235.25.156 2a01:4f8:1c1e:dabe::1AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: aragorn.data-horizon.de, gandalf.data-horizon.net.
    #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 (AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 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, .net.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

fail

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
aragorn.data-horizon.de 148.251.12.23NOERROR, 2 ms, authoritativenoyes / yesrefusednone
aragorn.data-horizon.de 2a01:4f8:201:7124::2NOERROR, 6 ms, authoritativenoyes / yesrefusednone
gandalf.data-horizon.net 167.235.25.156NOERROR, 4 ms, authoritativenoyes / yesALLOWED (35 records)9.18.49-1~deb12u2-Debian
gandalf.data-horizon.net 2a01:4f8:1c1e:dabe::1NOERROR, 4 ms, authoritativenoyes / yesALLOWED (35 records)9.18.49-1~deb12u2-Debian

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: gandalf.data-horizon.net: "9.18.49-1~deb12u2-Debian". Hide or replace the version string.
    #17
  • ✗
    Zone transfer allowed
    These nameservers send the complete zone to anyone who asks (AXFR), exposing all host names: gandalf.data-horizon.net (167.235.25.156): 35 records; gandalf.data-horizon.net (2a01:4f8:1c1e:dabe::1): 35 records. Restrict zone transfers to your secondary servers.
    #18
  • ✓ 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 2026090903 · primary aragorn.data-horizon.de

Found

Primary (MNAME)
aragorn.data-horizon.de
Contact (RNAME)
wagner\.gerd.uni-jena.de
Serial
2026090903
Refresh / retry
10800 s / 3600 s
Expire
1209600 s
Negative TTL
10800 s

Serial per nameserver

NameserverSerial
aragorn.data-horizon.de (148.251.12.23)2026090903
aragorn.data-horizon.de (2a01:4f8:201:7124::2)2026090903
gandalf.data-horizon.net (167.235.25.156)2026090903
gandalf.data-horizon.net (2a01:4f8:1c1e:dabe::1)2026090903

Checks

  • ✓ Serial 2026090903 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 14d, negative TTL 3h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver aragorn.data-horizon.de is one of the listed nameservers.
  • ✓ Contact wagner.gerd@uni-jena.de #25
    The SOA RNAME wagner\.gerd.uni-jena.de means wagner.gerd@uni-jena.de.
  • ✓ Date-based serial #26
    The serial 2026090903 follows the YYYYMMDDnn convention (2026-09-09).

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
148.251.12.23:53
TypeValueTTL
SOAaragorn.data-horizon.de. wagner\.gerd.uni-jena.de. 2026090903 10800 3600 1209600 1080086400
NSaragorn.data-horizon.de.86400
NSgandalf.data-horizon.net.86400
A148.251.12.2386400
AAAA2a01:4f8:201:7124::286400
MX10 mail.suizidprophylaxe.de.86400
TXT"v=spf1 +a +mx +a:aragorn.data-horizon.de -all"86400
TXT"MS=ms90544927"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, AAAA 1d, MX 1d, 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