knappschaft-kliniken.de

Checked 21 October 2026, 23:10 UTC · via 8.8.8.8
!Passed with warnings
20 passed 3 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

warn

adns01.de.tmr.net, adns02.de.tmr.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
adns01.de.tmr.net, adns02.de.tmr.net
NS in the zone
adns01.de.tmr.net, adns02.de.tmr.net
NameserverAddressesNetwork (AS)Glue
adns01.de.tmr.net212.23.147.66AS12329 TMR - GLASFASER RUHR GmbH & Co. KG, DE-
adns02.de.tmr.net212.23.146.234AS12329 TMR - GLASFASER RUHR GmbH & Co. KG, DE-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: adns01.de.tmr.net, adns02.de.tmr.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 0 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS12329 (TMR - GLASFASER RUHR GmbH & Co. KG, 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 .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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

warn

2 of 2 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
adns01.de.tmr.net 212.23.147.66NOERROR, 10 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 5.1.4 (built Aug 5 2026 13:12:37 by root@localhost)
adns02.de.tmr.net 212.23.146.234NOERROR, 10 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 5.1.4 (built Aug 5 2026 13:12:37 by root@localhost)

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: adns01.de.tmr.net: "PowerDNS Authoritative Server 5.1.4 (built Aug 5 2026 13:12:37 by root@localhost)"; adns02.de.tmr.net: "PowerDNS Authoritative Server 5.1.4 (built Aug 5 2026 13:12:37 by root@localhost)". Hide or replace the version string.
    #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 1789369416 · primary adns01.de.tmr.net

Found

Primary (MNAME)
adns01.de.tmr.net
Contact (RNAME)
hostmaster.knappschaft-kliniken.de
Serial
1789369416
Refresh / retry
10800 s / 1800 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
adns01.de.tmr.net (212.23.147.66)1789369416
adns02.de.tmr.net (212.23.146.234)1789369416

Checks

  • ✓ Serial 1789369416 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 30m, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver adns01.de.tmr.net is one of the listed nameservers.
  • ✓ Contact hostmaster@knappschaft-kliniken.de #25
    The SOA RNAME hostmaster.knappschaft-kliniken.de means hostmaster@knappschaft-kliniken.de.
  • ✓ Timestamp serial #26
    The serial 1789369416 is a Unix timestamp (2026-09-14 07:03 UTC).

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

11 records at the apex

Found

Read from
212.23.147.66:53
TypeValueTTL
SOAadns01.de.tmr.net. hostmaster.knappschaft-kliniken.de. 1789369416 10800 1800 604800 36003600
NSadns01.de.tmr.net.3600
NSadns02.de.tmr.net.3600
A212.23.140.2213600
MX10 mailext01.knappschaft-kliniken.de.3600
MX20 mailext02.knappschaft-kliniken.de.3600
TXT"cisco-ci-domain-verification=65583c7d484d6d2a36423e0eccb38e2eb2bfc5f86ae375a1a7fc18b6f07d72a4"3600
TXT"v=spf1 mx ip4:212.23.143.115 ip4:212.23.143.116 ip4:212.23.143.117 -all"3600
TXT"_qiby6mleoyczk772hxtjijiw3makc6v"3600
TXT"_3h5eno9pjsr1f4kee635fxjklp54t8o"3600
TXT"apple-domain-verification=LAy7ZgM8NyP9Xu4t"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.
  • ✓ 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