vdi.de

Checked 22 October 2026, 00:50 UTC · via 8.8.8.8
!Passed with warnings
21 passed 1 warning 0 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

info

a.ns.nrw.net, b.ns.nrw.net, c.ns.nrw.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
a.ns.nrw.net, b.ns.nrw.net, c.ns.nrw.net
NS in the zone
a.ns.nrw.net, b.ns.nrw.net, c.ns.nrw.net
NameserverAddressesNetwork (AS)Glue
a.ns.nrw.net23.88.49.189 2a01:4f8:c0c:165b::1AS24940 HETZNER-AS - Hetzner Online GmbH, DE AS24940 HETZNER-AS - Hetzner Online GmbH, DE-
b.ns.nrw.net159.25.145.72AS5517 CSL - CSL Computer Service Langenbach GmbH, DE-
c.ns.nrw.net192.95.37.184 2607:5300:203:7e6d::2222AS16276 OVH - OVH SAS, FR AS16276 OVH - OVH SAS, FR-

Checks

  • ✓ 3 nameservers #6
    Delegated to a.ns.nrw.net, b.ns.nrw.net, c.ns.nrw.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 2 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS16276 (OVH - OVH SAS, FR): 2 addresses; AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 2 addresses; AS5517 (CSL - CSL Computer Service Langenbach GmbH, DE): 1 address.
  • i
    All nameserver names under .net
    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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: b.ns.nrw.net.
    #13

Nameservers

info

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a.ns.nrw.net 23.88.49.189NOERROR, 0 ms, authoritativenoyes / yesrefusedJNSv2
a.ns.nrw.net 2a01:4f8:c0c:165b::1NOERROR, 0 ms, authoritativenoyes / yesrefusedJNSv2
b.ns.nrw.net 159.25.145.72NOERROR, 7 ms, authoritativenoyes / yesrefusedJNSv2
c.ns.nrw.net 192.95.37.184NOERROR, 96 ms, authoritativenoyes / yesrefusedJNSv2
c.ns.nrw.net 2607:5300:203:7e6d::2222NOERROR, 95 ms, authoritativenoyes / yesrefusedJNSv2

Checks

  • ✓ All respond #14
    All 5 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: a.ns.nrw.net: "JNSv2"; b.ns.nrw.net: "JNSv2"; c.ns.nrw.net: "JNSv2".
    #17
  • ✓ 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 2026100114 · primary a.ns.nrw.net

Found

Primary (MNAME)
a.ns.nrw.net
Contact (RNAME)
hostmaster.joker.com
Serial
2026100114
Refresh / retry
14400 s / 3600 s
Expire
1209600 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
a.ns.nrw.net (23.88.49.189)2026100114
a.ns.nrw.net (2a01:4f8:c0c:165b::1)2026100114
b.ns.nrw.net (159.25.145.72)2026100114
c.ns.nrw.net (192.95.37.184)2026100114
c.ns.nrw.net (2607:5300:203:7e6d::2222)2026100114

Checks

  • ✓ Serial 2026100114 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 14d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a.ns.nrw.net is one of the listed nameservers.
  • ✓ Contact hostmaster@joker.com #25
    The SOA RNAME hostmaster.joker.com means hostmaster@joker.com.
  • ✓ Date-based serial #26
    The serial 2026100114 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

13 records at the apex

Found

Read from
23.88.49.189:53
TypeValueTTL
SOAa.ns.nrw.net. hostmaster.joker.com. 2026100114 14400 3600 1209600 30086400
NSb.ns.nrw.net.86400
NSa.ns.nrw.net.86400
NSc.ns.nrw.net.86400
A194.245.143.9086400
MX0 vdi-de.mail.protection.outlook.com.86400
TXT"J1Ssm5+JQzN9n8xpNkY3KcYYzHramERmkUbMzqfnj4IBr8LHr3ch/PguicPuF6lBGkbYhzSsAAqF+1t0SOz6/g=="86400
TXT"cisco-ci-domain-verification=d03e8d53db7df663b8eee4e9ad1f5f3de50c26ffb5223a7fdd93feb7139c948"86400
TXT"atlassian-domain-verification=AWlBvar9U21WuoZWUYy0+AQxdz+RAoMK5H+C933JL9sypeZFoSG1TXvddbNDoKDj"86400
TXT"google-site-verification=y_SA3Hhau2iAISUhQjKAcnmLmQN3YbsyhCdRG0GLvlA"86400
TXT"MS=ms30272014"86400
TXT"v=spf1 include:_spf.csl.de include:_spf.vdi.de include:spf.srv2.de include:emarsys.net include:_spf.zimpel.de include:spf.mailjet.com include:spf.de.cancom-mase.com include:spfa.myconvento.com include:spf.protection.outlook.com ~all"86400
TXT"cisco-ci-domain-verification=3c041ba7c7ea5521784f0c3f474fe0d8f2b1da32530a50a4c6bfa65f29d54b28"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 1d, NS 1d.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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