digital-experts.de

Checked 21 October 2026, 22:14 UTC · via 8.8.8.8
✗Problems found
19 passed 2 warnings 1 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

ns0.digital-experts.de, nsb6.schlundtech.de, nsc6.schlundtech.de, nsd6.schlundtech.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns0.digital-experts.de, nsb6.schlundtech.de, nsc6.schlundtech.de, nsd6.schlundtech.de
NS in the zone
ns0.digital-experts.de, nsb6.schlundtech.de, nsc6.schlundtech.de, nsd6.schlundtech.de
NameserverAddressesNetwork (AS)Glue
ns0.digital-experts.de5.9.9.48AS24940 HETZNER-AS - Hetzner Online GmbH, DE5.9.9.48
nsb6.schlundtech.de185.132.35.227 2607:f1c0:fe:53:185:132:35:227AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB-
nsc6.schlundtech.de217.160.80.227 2001:8d8:fe:53:217:160:80:227AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE-
nsd6.schlundtech.de217.160.81.227 2001:8d8:fe:53:217:160:81:227AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns0.digital-experts.de, nsb6.schlundtech.de, nsc6.schlundtech.de, nsd6.schlundtech.de.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns0.digital-experts.de.
  • ✓ 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 4 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS15418 (IONOS-ANYCAST - Fasthosts Internet Limited, GB): 2 addresses; AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 1 address; AS8560 (IONOS-AS - IONOS SE, DE): 4 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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns0.digital-experts.de.
    #13

Nameservers

fail

7 of 7 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns0.digital-experts.de 5.9.9.48NOERROR, 2 ms, authoritativenoyes / yesALLOWED (30 records)9.16.15-Debian
nsb6.schlundtech.de 185.132.35.227NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsb6.schlundtech.de 2607:f1c0:fe:53:185:132:35:227NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsc6.schlundtech.de 217.160.80.227NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsc6.schlundtech.de 2001:8d8:fe:53:217:160:80:227NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsd6.schlundtech.de 217.160.81.227NOERROR, 10 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsd6.schlundtech.de 2001:8d8:fe:53:217:160:81:227NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/

Checks

  • ✓ All respond #14
    All 7 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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns0.digital-experts.de: "9.16.15-Debian". Hide or replace the version string.
    #17
  • ✗
    Zone transfer allowed
    These nameservers send the complete zone to anyone who asks (AXFR), exposing all host names: ns0.digital-experts.de (5.9.9.48): 30 records. Restrict zone transfers to your secondary servers.
    #18
  • ✓ 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

info

serial 2026052001 · primary ns1.digital-experts.de

Found

Primary (MNAME)
ns1.digital-experts.de
Contact (RNAME)
root.digital-experts.de
Serial
2026052001
Refresh / retry
10001 s / 2000 s
Expire
2419200 s
Negative TTL
10800 s

Serial per nameserver

NameserverSerial
ns0.digital-experts.de (5.9.9.48)2026052001
nsb6.schlundtech.de (185.132.35.227)2026052001
nsb6.schlundtech.de (2607:f1c0:fe:53:185:132:35:227)2026052001
nsc6.schlundtech.de (217.160.80.227)2026052001
nsc6.schlundtech.de (2001:8d8:fe:53:217:160:80:227)2026052001
nsd6.schlundtech.de (217.160.81.227)2026052001
nsd6.schlundtech.de (2001:8d8:fe:53:217:160:81:227)2026052001

Checks

  • ✓ Serial 2026052001 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h46m41s, retry 33m20s, expire 28d, negative TTL 3h.
  • i
    Hidden master
    The primary nameserver ns1.digital-experts.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 root@digital-experts.de #25
    The SOA RNAME root.digital-experts.de means root@digital-experts.de.
  • ✓ Date-based serial #26
    The serial 2026052001 follows the YYYYMMDDnn convention (2026-05-20).

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

15 records at the apex

Found

Read from
5.9.9.48:53
TypeValueTTL
SOAns1.digital-experts.de. root.digital-experts.de. 2026052001 10001 2000 2419200 108003600
NSns0.digital-experts.de.3600
NSnsb6.schlundtech.de.3600
NSnsc6.schlundtech.de.3600
NSnsd6.schlundtech.de.3600
A5.9.9.483600
AAAA2a01:4f8:160:74b3::23600
MX10 mail.digital-experts.de.3600
TXT"Email: service@digital-experts.de"3600
TXT"v=spf1 a mx -all"3600
TXT"Digital Experts"3600
TXT"Ostlandstrasse 9"3600
TXT"Tel.: +49(0)7725-482507"3600
TXT"78126 Koenigsfeld"3600
TXT"Fax.: +49(0)7725-482505"3600

Checks

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