studienstiftung.de

Checked 22 October 2026, 00:31 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.checkdomain.de, ns2.checkdomain.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.checkdomain.de, ns2.checkdomain.de
NS in the zone
ns.checkdomain.de, ns2.checkdomain.de
NameserverAddressesNetwork (AS)Glue
ns.checkdomain.de109.237.143.11 2a02:2b80:101:5000::9AS45012 CLOUDPIT - dogado GmbH, DE AS45012 CLOUDPIT - dogado GmbH, DE109.237.143.11 2a02:2b80:101:5000::9
ns2.checkdomain.de5.9.190.98 2a01:4f8:2b02:a88::106AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE5.9.190.98 2a01:4f8:2b02:a88::106

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns.checkdomain.de, ns2.checkdomain.de.
    #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.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 2 addresses; AS45012 (CLOUDPIT - dogado GmbH, DE): 2 addresses.
  • i
    All nameserver names under .de
    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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.checkdomain.de 109.237.143.11NOERROR, 17 ms, authoritativenoyes / yesrefused-
ns.checkdomain.de 2a02:2b80:101:5000::9NOERROR, 16 ms, authoritativenoyes / yesrefused-
ns2.checkdomain.de 5.9.190.98NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns2.checkdomain.de 2a01:4f8:2b02:a88::106NOERROR, 3 ms, authoritativenoyes / yesrefused-

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.
  • ✓ 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

pass

serial 2026100103 · primary ns.checkdomain.de

Found

Primary (MNAME)
ns.checkdomain.de
Contact (RNAME)
hostmaster.checkdomain.de
Serial
2026100103
Refresh / retry
40000 s / 7200 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns.checkdomain.de (109.237.143.11)2026100103
ns.checkdomain.de (2a02:2b80:101:5000::9)2026100103
ns2.checkdomain.de (5.9.190.98)2026100103
ns2.checkdomain.de (2a01:4f8:2b02:a88::106)2026100103

Checks

  • ✓ Serial 2026100103 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 11h6m40s, retry 2h, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.checkdomain.de is one of the listed nameservers.
  • ✓ Contact hostmaster@checkdomain.de #25
    The SOA RNAME hostmaster.checkdomain.de means hostmaster@checkdomain.de.
  • ✓ Date-based serial #26
    The serial 2026100103 follows the YYYYMMDDnn convention (2026-10-01).

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

10 records at the apex

Found

Read from
109.237.143.11:53
TypeValueTTL
SOAns.checkdomain.de. hostmaster.checkdomain.de. 2026100103 40000 7200 604800 36003600
NSns2.checkdomain.de.86400
NSns.checkdomain.de.86400
A136.243.163.1873600
MX10 a2261.mx.srv.dfn.de.3600
MX10 b2261.mx.srv.dfn.de.3600
MX10 c2261.mx.srv.dfn.de.3600
TXT"v=spf1 mx:s2262.mx.srv.dfn.de ip4:195.37.184.94 ip4:195.37.184.91 ip4:195.37.184.89 ip4:136.243.163.187 ip4:194.95.249.4 ip4:92.51.171.103 ip4:80.237.190.108 ip4:136.243.13.126 include:spf.mailsupport.dfn.de include:kundenmailing.net include:eurte.people" "path.com include:spf.de.umantis.com -all"900
TXT"MS=AD6EA211F10EB28F50B0E14D0B68885972C50D1F"3600
TXT"google-site-verification=IXec1xk4ytKpu6lkMLpHsOv2GDHB1Q5qowjKUcHvhIg"3600

Checks

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