fdp.de

Checked 21 October 2026, 22:20 UTC · via 8.8.8.8
!Passed with warnings
24 passed 1 warning 0 failed 4 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

dns.blatzheim.com, dns.bn-online.net, dns2.bn-online.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns.blatzheim.com, dns.bn-online.net, dns2.bn-online.net
NS in the zone
dns.blatzheim.com, dns.bn-online.net, dns2.bn-online.net
NameserverAddressesNetwork (AS)Glue
dns.blatzheim.com217.76.96.35 2a02:b30:101:100::2AS20886 DE-IORG-AS-1 - bn:t Blatzheim Networks Telecom GmbH, DE AS20886 DE-IORG-AS-1 - bn:t Blatzheim Networks Telecom GmbH, DE-
dns.bn-online.net217.76.97.35 2a02:b30:201:100::35AS20886 DE-IORG-AS-1 - bn:t Blatzheim Networks Telecom GmbH, DE AS20886 DE-IORG-AS-1 - bn:t Blatzheim Networks Telecom GmbH, DE-
dns2.bn-online.net217.76.99.35 2a02:b30:301:100::35AS20886 DE-IORG-AS-1 - bn:t Blatzheim Networks Telecom GmbH, DE AS20886 DE-IORG-AS-1 - bn:t Blatzheim Networks Telecom GmbH, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to dns.blatzheim.com, dns.bn-online.net, dns2.bn-online.net.
  • ✓ 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 3 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS20886 (DE-IORG-AS-1 - bn:t Blatzheim Networks Telecom GmbH, DE): 6 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .com, .net.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns.blatzheim.com 217.76.96.35NOERROR, 7 ms, authoritativenoyes / yesrefused-
dns.blatzheim.com 2a02:b30:101:100::2NOERROR, 7 ms, authoritativenoyes / yesrefused-
dns.bn-online.net 217.76.97.35NOERROR, 3 ms, authoritativenoyes / yesrefused-
dns.bn-online.net 2a02:b30:201:100::35NOERROR, 4 ms, authoritativenoyes / yesrefused-
dns2.bn-online.net 217.76.99.35NOERROR, 8 ms, authoritativenoyes / yesrefused-
dns2.bn-online.net 2a02:b30:301:100::35NOERROR, 8 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

pass

serial 2026090901 · primary dns.blatzheim.com

Found

Primary (MNAME)
dns.blatzheim.com
Contact (RNAME)
postmaster.comdok.de
Serial
2026090901
Refresh / retry
7200 s / 3600 s
Expire
604800 s
Negative TTL
21600 s

Serial per nameserver

NameserverSerial
dns.blatzheim.com (217.76.96.35)2026090901
dns.blatzheim.com (2a02:b30:101:100::2)2026090901
dns.bn-online.net (217.76.97.35)2026090901
dns.bn-online.net (2a02:b30:201:100::35)2026090901
dns2.bn-online.net (217.76.99.35)2026090901
dns2.bn-online.net (2a02:b30:301:100::35)2026090901

Checks

  • ✓ Serial 2026090901 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, retry 1h, expire 7d, negative TTL 6h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns.blatzheim.com is one of the listed nameservers.
  • ✓ Contact postmaster@comdok.de #25
    The SOA RNAME postmaster.comdok.de means postmaster@comdok.de.
  • ✓ Date-based serial #26
    The serial 2026090901 follows the YYYYMMDDnn convention (2026-09-09).

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

11 records at the apex

Found

Read from
217.76.96.35:53
TypeValueTTL
SOAdns.blatzheim.com. postmaster.comdok.de. 2026090901 7200 3600 604800 216007200
NSdns2.bn-online.net.7200
NSdns.blatzheim.com.7200
NSdns.bn-online.net.7200
A35.190.44.477200
MX20 mx20.comdok.de.7200
MX10 mx10.comdok.de.7200
TXT"MS=ms38310322"7200
TXT"MS=D85A6330F24612F6C233DE583A359CFD118D3553"7200
TXT"ZO9RF2KGJ4T5NYBV"7200
TXT"v=spf1 ip4:217.76.110.0/23 include:_spf.universum.com include:spf.mailjet.com ~all"7200

Checks

  • ✓ TTLs within range #32
    TTLs: A 2h, MX 2h, NS 2h. The NS TTL at the parent is 1d and in the zone 2h; 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