klinikum-stuttgart.de

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

ns5.twosteps.info, ns6.twosteps.info, ns7.twosteps.info

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns5.twosteps.info, ns6.twosteps.info, ns7.twosteps.info
NS in the zone
ns5.twosteps.info, ns6.twosteps.info, ns7.twosteps.info
NameserverAddressesNetwork (AS)Glue
ns5.twosteps.info159.69.22.248AS24940 HETZNER-AS - Hetzner Online GmbH, DE-
ns6.twosteps.info195.201.232.252 2a01:4f8:1c17:642e::1AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE-
ns7.twosteps.info95.216.145.89 2a01:4f9:c010:94c::1AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns5.twosteps.info, ns6.twosteps.info, ns7.twosteps.info.
  • ✓ 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 3 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): 5 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 .info
    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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns5.twosteps.info.
    #13

Nameservers

warn

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns5.twosteps.info 159.69.22.248NOERROR, 0 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.8.5 (built Feb 7 2025 09:21:19 by root@localhost)
ns6.twosteps.info 195.201.232.252NOERROR, 4 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.8.5 (built Feb 7 2025 09:21:19 by root@localhost)
ns6.twosteps.info 2a01:4f8:1c17:642e::1NOERROR, 3 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.8.5 (built Feb 7 2025 09:21:19 by root@localhost)
ns7.twosteps.info 95.216.145.89NOERROR, 26 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.8.5 (built Feb 7 2025 09:21:19 by root@localhost)
ns7.twosteps.info 2a01:4f9:c010:94c::1NOERROR, 26 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.8.5 (built Feb 7 2025 09:21:19 by root@localhost)

Checks

  • ✓ All respond #14
    All 5 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: ns5.twosteps.info: "PowerDNS Authoritative Server 4.8.5 (built Feb 7 2025 09:21:19 by root@localhost)"; ns6.twosteps.info: "PowerDNS Authoritative Server 4.8.5 (built Feb 7 2025 09:21:19 by root@localhost)"; ns7.twosteps.info: "PowerDNS Authoritative Server 4.8.5 (built Feb 7 2025 09:21:19 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 2026090101 · primary ns5.twosteps.info

Found

Primary (MNAME)
ns5.twosteps.info
Contact (RNAME)
postmaster.klinikum-stuttgart.de
Serial
2026090101
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns5.twosteps.info (159.69.22.248)2026090101
ns6.twosteps.info (195.201.232.252)2026090101
ns6.twosteps.info (2a01:4f8:1c17:642e::1)2026090101
ns7.twosteps.info (95.216.145.89)2026090101
ns7.twosteps.info (2a01:4f9:c010:94c::1)2026090101

Checks

  • ✓ Serial 2026090101 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns5.twosteps.info is one of the listed nameservers.
  • ✓ Contact postmaster@klinikum-stuttgart.de #25
    The SOA RNAME postmaster.klinikum-stuttgart.de means postmaster@klinikum-stuttgart.de.
  • ✓ Date-based serial #26
    The serial 2026090101 follows the YYYYMMDDnn convention (2026-09-01).

DNSSEC

warn

Signed, but no DS at parent

Found

Validated by resolver
no
Denial of existence
NSEC
Signatures valid until
29 October 2026

DNSKEY in the zone

Key tagRoleAlgorithm
28631KSK (257)ECDSAP256SHA256 (13)

Checks

  • !
    Signed but not delegated securely
    The zone is signed but the parent has no DS record, so the signatures are not used. Publish the DS record at your registrar.
    #27
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-10-29 #30
    The earliest DNSKEY/SOA signature expires at 2026-10-29 00:00 UTC.
  • i
    NSEC
    The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.
    #31

Records

warn

11 records at the apex

Found

Read from
159.69.22.248:53
TypeValueTTL
SOAns5.twosteps.info. postmaster.klinikum-stuttgart.de. 2026090101 10800 3600 604800 86400900
NSns7.twosteps.info.900
NSns6.twosteps.info.900
NSns5.twosteps.info.900
A185.48.116.1571001
MX5 de-smtp-inbound-2.mimecast.com.60
MX5 de-smtp-inbound-1.mimecast.com.60
TXT"MS=368E0EA246C0CDB9C4B7CECB299A619E80156415"300
TXT"v=spf1 mx ip4:207.154.244.56 ip4:185.21.101.174 ip4:85.184.250.146 ip4:213.165.72.36 ip4:212.132.69.99 ip4:185.48.116.157 include:de._netblocks.mimecast.com -all"300
TXT"ZnVMx9Bk8Dpx99zWv0euEinV50q3KG57yyaYbaAQTRk3utX1GafatK6/su35T01abt8H7WJi+Bz96Bb82rRm3g=="600
TXT"MS=ms52884733"300

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: MX (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 15m; resolvers may use either.
    #32
  • ✓ 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