blutspende.de

Checked 21 October 2026, 21:50 UTC · via 8.8.8.8
!Passed with warnings
21 passed 3 warnings 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

warn

ns.nats.de, ns2.nats.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.nats.de, ns2.nats.de
NS in the zone
ns.comback.de, ns2.comback.de
NameserverAddressesNetwork (AS)Glue
ns.comback.de (zone only)194.246.86.110AS41431 COMbackAS - COMBACK GmbH, DE-
ns.nats.de (parent only)194.246.86.110AS41431 COMbackAS - COMBACK GmbH, DE194.246.86.110
ns2.comback.de (zone only)195.216.198.202AS44499 GM-AS - GRASS-MERKUR GmbH & Co. KG, DE-
ns2.nats.de (parent only)195.216.198.202AS44499 GM-AS - GRASS-MERKUR GmbH & Co. KG, DE195.216.198.202

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns.nats.de, ns2.nats.de.
    #6
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only at the parent: ns.nats.de, ns2.nats.de; only in the zone: ns.comback.de, ns2.comback.de. ns.comback.de, ns.nats.de, ns2.comback.de, ns2.nats.de report NS ns.comback.de ns2.comback.de.
    #7
  • ✓ 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.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS41431 (COMbackAS - COMBACK GmbH, DE): 2 addresses; AS44499 (GM-AS - GRASS-MERKUR GmbH & Co. KG, 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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

pass

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.comback.de 194.246.86.110NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns.nats.de 194.246.86.110NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns2.comback.de 195.216.198.202NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns2.nats.de 195.216.198.202NOERROR, 11 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 2026061803 · primary ns.comback.de

Found

Primary (MNAME)
ns.comback.de
Contact (RNAME)
info.blutspende.de
Serial
2026061803
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns.comback.de (194.246.86.110)2026061803
ns.nats.de (194.246.86.110)2026061803
ns2.comback.de (195.216.198.202)2026061803
ns2.nats.de (195.216.198.202)2026061803

Checks

  • ✓ Serial 2026061803 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.comback.de is one of the listed nameservers.
  • ✓ Contact info@blutspende.de #25
    The SOA RNAME info.blutspende.de means info@blutspende.de.
  • ✓ Date-based serial #26
    The serial 2026061803 follows the YYYYMMDDnn convention (2026-06-18).

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

14 records at the apex

Found

Read from
194.246.86.110:53
TypeValueTTL
SOAns.comback.de. info.blutspende.de. 2026061803 28800 7200 604800 864003600
NSns2.comback.de.3600
NSns.comback.de.3600
A91.190.229.2453600
MX10 mail4.blutspende.de.300
MX10 mail3.blutspende.de.300
TXT"atlassian-domain-verification=kCG3mewsNFBAofVxJyRIF1Gew/0QnDtqpTAqqyGJTI2I6MYHSN3x61iVJ7M8desv"3600
TXT"google-site-verification=YqikF1c-ZKBrY0oQqsiCu28ny3aBIYXZ5RZ4IotR45g"3600
TXT"google-site-verification=-YwtOaWo3IsQeGfMuKHLpycFKjMocylsun1bxq8RUh8"3600
TXT"globalsign-domain-verification=A2616661734CE0D3D9DFE1924FC5BD42"3600
TXT"fmpsbcbm5m5p21al9vimcstkmk"3600
TXT"v=spf1 mx a:mx02.deltacity.net ~all"3600
TXT"langdock-verify=nvU3P-FgovNjHR2nqTb4d5iNoQ5wRJNDmw880rGHiBM"3600
TXT"u3almlat1fq80k32as0f2uq0ij"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 5m, 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