ihre-vorsorge.de

Checked 21 October 2026, 22:52 UTC · via 8.8.8.8
✗Problems found
17 passed 3 warnings 2 failed 7 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

a.ns.plusline.net, b.ns.plusline.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
a.ns.plusline.net, b.ns.plusline.de
NS in the zone
ns1.sendinblue.com, ns2.sendinblue.com
NameserverAddressesNetwork (AS)Glue
a.ns.plusline.net (parent only)212.19.48.53 2a02:2e0:2810:204:d::53AS12306 PLUSLINE - Plus.line AG, DE AS12306 PLUSLINE - Plus.line AG, DE-
b.ns.plusline.de (parent only)212.19.40.53 2a02:2e0:2810:205:d::53AS12306 PLUSLINE - Plus.line AG, DE AS12306 PLUSLINE - Plus.line AG, DE-
ns1.sendinblue.com (zone only)162.159.24.194AS13335 CLOUDFLARENET - Cloudflare, Inc., US-
ns2.sendinblue.com (zone only)162.159.25.159AS13335 CLOUDFLARENET - Cloudflare, Inc., US-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: a.ns.plusline.net, b.ns.plusline.de.
    #6
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only at the parent: a.ns.plusline.net, b.ns.plusline.de; only in the zone: ns1.sendinblue.com, ns2.sendinblue.com. a.ns.plusline.net, b.ns.plusline.de report NS ns1.sendinblue.com ns2.sendinblue.com.
    #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.
  • i
    One address family in one network
    all IPv6 addresses are in 2a02:2e0:2810::/48, while the other address family is spread over several networks.
    #10
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS12306 (PLUSLINE - Plus.line AG, DE): 4 addresses; AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 2 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns1.sendinblue.com, ns2.sendinblue.com.
    #13

Nameservers

fail

4 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a.ns.plusline.net 212.19.48.53NOERROR, 4 ms, authoritativenoyes / yesrefused-
a.ns.plusline.net 2a02:2e0:2810:204:d::53NOERROR, 4 ms, authoritativenoyes / yesrefused-
b.ns.plusline.de 212.19.40.53NOERROR, 4 ms, authoritativenoyes / yesrefused-
b.ns.plusline.de 2a02:2e0:2810:205:d::53NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns1.sendinblue.com 162.159.24.194REFUSED, 19 ms, NOT authoritativenono / yesrefused2026.10.8
ns2.sendinblue.com 162.159.25.159REFUSED, 20 ms, NOT authoritativenono / yesrefused2026.10.8

Checks

  • ✓ All respond #14
    All 6 nameserver addresses answered.
  • ✗
    Lame delegation
    These nameservers don't answer authoritatively for the zone, so resolvers ignore them: ns1.sendinblue.com (162.159.24.194): REFUSED, authoritative=false; ns2.sendinblue.com (162.159.25.159): REFUSED, authoritative=false.
    #15
  • ✓ 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: ns1.sendinblue.com: "2026.10.8"; ns2.sendinblue.com: "2026.10.8". Hide or replace the version string.
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns1.sendinblue.com (162.159.24.194): ; ns2.sendinblue.com (162.159.25.159): .
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

info

serial 2025121702 · primary ns.plusline.de

Found

Primary (MNAME)
ns.plusline.de
Contact (RNAME)
hostmaster.plusline.de
Serial
2025121702
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
a.ns.plusline.net (212.19.48.53)2025121702
a.ns.plusline.net (2a02:2e0:2810:204:d::53)2025121702
b.ns.plusline.de (212.19.40.53)2025121702
b.ns.plusline.de (2a02:2e0:2810:205:d::53)2025121702

Checks

  • ✓ Serial 2025121702 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 10m.
  • i
    Hidden master
    The primary nameserver ns.plusline.de is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact hostmaster@plusline.de #25
    The SOA RNAME hostmaster.plusline.de means hostmaster@plusline.de.
  • ✓ Date-based serial #26
    The serial 2025121702 follows the YYYYMMDDnn convention (2025-12-17).

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

9 records at the apex

Found

Read from
212.19.48.53:53
TypeValueTTL
SOAns.plusline.de. hostmaster.plusline.de. 2025121702 10800 3600 604800 600300
NSns1.sendinblue.com.300
NSns2.sendinblue.com.300
A128.140.49.189300
MX10 mailstore1.secureserver.net.300
MX10 mx0.webpack.hosteurope.de.300
MX0 smtp.secureserver.net.300
TXT"google-site-verification=b3ej5B_qwtTIvPSlNzx1ESLjB9lO_GCeAHvXf8BxGlE"300
TXT"v=spf1 include:spf.sendinblue.com mx include:secureserver.net -all"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