schirn.de

Checked 22 October 2026, 00:01 UTC · via 8.8.8.8
!Passed with warnings
23 passed 1 warning 0 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

ns.luka.de, ns1.first-ns.de, robotns2.second-ns.de, robotns3.second-ns.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.luka.de, ns1.first-ns.de, robotns2.second-ns.de, robotns3.second-ns.com
NS in the zone
ns.luka.de, ns1.first-ns.de, robotns2.second-ns.de, robotns3.second-ns.com
NameserverAddressesNetwork (AS)Glue
ns.luka.de91.98.208.164AS24940 HETZNER-AS - Hetzner Online GmbH, DE91.98.208.164
ns1.first-ns.de213.239.242.238 2a01:4f8:0:a101::a:1AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE-
robotns2.second-ns.de213.133.100.103 2a01:4f8:0:1::5ddc:2AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE-
robotns3.second-ns.com193.47.99.3 2001:67c:192c::add:a3AS12337 NORIS-NETWORK - noris network AG, DE AS12337 NORIS-NETWORK - noris network AG, DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns.luka.de, ns1.first-ns.de, robotns2.second-ns.de, robotns3.second-ns.com.
  • ✓ 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 4 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS12337 (NORIS-NETWORK - noris network AG, DE): 2 addresses; AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 5 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .com, .de.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns.luka.de.
    #13

Nameservers

warn

7 of 7 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.luka.de 91.98.208.164NOERROR, 4 ms, authoritativenoyes / yesrefused9.20.29-1~deb13u1-Debian
ns1.first-ns.de 213.239.242.238NOERROR, 2 ms, authoritativenoyes / yesrefused-
ns1.first-ns.de 2a01:4f8:0:a101::a:1NOERROR, 2 ms, authoritativenoyes / yesrefused-
robotns2.second-ns.de 213.133.100.103NOERROR, 0 ms, authoritativenoyes / yesrefused-
robotns2.second-ns.de 2a01:4f8:0:1::5ddc:2NOERROR, 0 ms, authoritativenoyes / yesrefused-
robotns3.second-ns.com 193.47.99.3NOERROR, 6 ms, authoritativenoyes / yesrefused-
robotns3.second-ns.com 2001:67c:192c::add:a3NOERROR, 6 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 7 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: ns.luka.de: "9.20.29-1~deb13u1-Debian". 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 2026083101 · primary ns.luka.de

Found

Primary (MNAME)
ns.luka.de
Contact (RNAME)
ns.luka.de
Serial
2026083101
Refresh / retry
10800 s / 1800 s
Expire
604800 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
ns.luka.de (91.98.208.164)2026083101
ns1.first-ns.de (213.239.242.238)2026083101
ns1.first-ns.de (2a01:4f8:0:a101::a:1)2026083101
robotns2.second-ns.de (213.133.100.103)2026083101
robotns2.second-ns.de (2a01:4f8:0:1::5ddc:2)2026083101
robotns3.second-ns.com (193.47.99.3)2026083101
robotns3.second-ns.com (2001:67c:192c::add:a3)2026083101

Checks

  • ✓ Serial 2026083101 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 30m, expire 7d, negative TTL 15m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.luka.de is one of the listed nameservers.
  • ✓ Contact ns@luka.de #25
    The SOA RNAME ns.luka.de means ns@luka.de.
  • ✓ Date-based serial #26
    The serial 2026083101 follows the YYYYMMDDnn convention (2026-08-31).

DNSSEC

info

Not signed

Found

Validated by resolver
no
Lookup error: read udp 46.225.38.91:46247->91.98.208.164:53: i/o timeout

Checks

  • i
    Could not be checked
    The DNSSEC lookup failed, so this could not be checked: read udp 46.225.38.91:46247->91.98.208.164:53: i/o timeout
    #27

Records

info

10 records at the apex

Found

Read from
91.98.208.164:53
TypeValueTTL
SOAns.luka.de. ns.luka.de. 2026083101 10800 1800 604800 9003600
NSns.luka.de.3600
NSrobotns2.second-ns.de.3600
NSns1.first-ns.de.3600
NSrobotns3.second-ns.com.3600
A202.61.252.1973600
AAAA2a03:4000:55:36:24b3:5cff:fee6:f2313600
TXT"v=spf1 ip4:80.150.212.50 ip4:202.61.252.197 ip6:2a03:4000:55:36:24b3:5cff:fee6:f231 include:spf.protection.outlook.com include:spf.codepiraten.com include:spf.nl2go.com ip4:88.99.254.229 ip4:88.99.254.228 include:servers.mcsv.net ~all"3600
TXT"google-site-verification=L3o3nyDWQZcF9uFq13BTs2va3Suq7CztTu5gi8Bj6b4"3600
TXT"MS=ms92350861"3600

Checks

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