documenta.de

Checked 21 October 2026, 22:14 UTC · via 8.8.8.8
!Passed with warnings
24 passed 2 warnings 0 failed 3 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

pass

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
ns1.first-ns.de, robotns2.second-ns.de, robotns3.second-ns.com
NS in the zone
ns1.first-ns.de, robotns2.second-ns.de, robotns3.second-ns.com
NameserverAddressesNetwork (AS)Glue
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

  • ✓ 3 nameservers #6
    Delegated to 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 3 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): 4 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .com, .de.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.first-ns.de 213.239.242.238NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns1.first-ns.de 2a01:4f8:0:a101::a:1NOERROR, 3 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, 1 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 6 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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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

warn

serial 2026083102 · primary ns1.first-ns.de

Found

Primary (MNAME)
ns1.first-ns.de
Contact (RNAME)
dns.hetzner.com
Serial
2026083102
Refresh / retry
1260 s / 7200 s
Expire
1209600 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns1.first-ns.de (213.239.242.238)2026083102
ns1.first-ns.de (2a01:4f8:0:a101::a:1)2026083102
robotns2.second-ns.de (213.133.100.103)2026083102
robotns2.second-ns.de (2a01:4f8:0:1::5ddc:2)2026083102
robotns3.second-ns.com (193.47.99.3)2026083102
robotns3.second-ns.com (2001:67c:192c::add:a3)2026083102

Checks

  • ✓ Serial 2026083102 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    retry 2h should be shorter than refresh 21m. Current values: refresh 21m, retry 2h, expire 14d, negative TTL 5m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.first-ns.de is one of the listed nameservers.
  • ✓ Contact dns@hetzner.com #25
    The SOA RNAME dns.hetzner.com means dns@hetzner.com.
  • ✓ Date-based serial #26
    The serial 2026083102 follows the YYYYMMDDnn convention (2026-08-31).

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

13 records at the apex

Found

Read from
213.239.242.238:53
TypeValueTTL
SOAns1.first-ns.de. dns.hetzner.com. 2026083102 1260 7200 1209600 3003600
NSrobotns2.second-ns.de.300
NSrobotns3.second-ns.com.300
NSns1.first-ns.de.300
A23.88.77.240300
MX10 documenta-de.mail.protection.outlook.com.300
TXT"MS=ms57781756"300
TXT"_globalsign-domain-verification=VICZrFmVZh2KdgUoYWcMhswq5QVRmZy56nOxn9EUXL"300
TXT"apple-domain-verification=86nUX3i35tEIC3p4"300
TXT"brevo-code:a1ee5990897edbcf563ac64df180968b"300
TXT"google-site-verification=nZS_Ax0t9zYdacVQ2U8CPdFqM2PQUqZ_k9hXGnQTsd0"300
TXT"v=spf1 a:k62283.coveto.de ip4:52.166.205.15 ip4:185.233.221.130 ip4:136.243.10.233 ip4:213.133.123.138 ip4:46.4.112.44 include:spf.protection.outlook.com include:spf.brevo.com include:_spf.pretix.eu -all"300
TXT"46hdOuV8fXESfYdTt9+TsuAApFWBAbMkBsUy33CkAMQCKdrwzPtEk9mJCaowPG+yT1rbaPhI6Sq9J+HRv7fh6w=="300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 5m. The NS TTL at the parent is 1d and in the zone 5m; 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