dza.de

Checked 21 October 2026, 22:15 UTC · via 8.8.8.8
!Passed with warnings
23 passed 1 warning 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

info

nsa5.schlundtech.de, nsb5.schlundtech.de, nsc5.schlundtech.de, nsd5.schlundtech.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
nsa5.schlundtech.de, nsb5.schlundtech.de, nsc5.schlundtech.de, nsd5.schlundtech.de
NS in the zone
nsa5.schlundtech.de, nsb5.schlundtech.de, nsc5.schlundtech.de, nsd5.schlundtech.de
NameserverAddressesNetwork (AS)Glue
nsa5.schlundtech.de185.132.34.227 2607:f1c0:fe:53:185:132:34:227AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB AS15418 IONOS-ANYCAST - Fasthosts Internet Limited, GB-
nsb5.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-
nsc5.schlundtech.de217.160.80.227 2001:8d8:fe:53:217:160:80:227AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE-
nsd5.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 nsa5.schlundtech.de, nsb5.schlundtech.de, nsc5.schlundtech.de, nsd5.schlundtech.de.
  • ✓ 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 4 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS15418 (IONOS-ANYCAST - Fasthosts Internet Limited, GB): 4 addresses; 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
nsa5.schlundtech.de 185.132.34.227NOERROR, 5 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsa5.schlundtech.de 2607:f1c0:fe:53:185:132:34:227NOERROR, 4 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsb5.schlundtech.de 185.132.35.227NOERROR, 5 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsb5.schlundtech.de 2607:f1c0:fe:53:185:132:35:227NOERROR, 4 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsc5.schlundtech.de 217.160.80.227NOERROR, 11 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsc5.schlundtech.de 2001:8d8:fe:53:217:160:80:227NOERROR, 11 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsd5.schlundtech.de 217.160.81.227NOERROR, 10 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsd5.schlundtech.de 2001:8d8:fe:53:217:160:81:227NOERROR, 10 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/

Checks

  • ✓ All respond #14
    All 8 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: nsa5.schlundtech.de: "Served by PowerDNS - https://www.powerdns.com/"; nsb5.schlundtech.de: "Served by PowerDNS - https://www.powerdns.com/"; nsc5.schlundtech.de: "Served by PowerDNS - https://www.powerdns.com/"; nsd5.schlundtech.de: "Served by PowerDNS - https://www.powerdns.com/".
    #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 2025111314 · primary nsa5.schlundtech.de

Found

Primary (MNAME)
nsa5.schlundtech.de
Contact (RNAME)
paul\.steffen.dza.de
Serial
2025111314
Refresh / retry
43200 s / 7200 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
nsa5.schlundtech.de (185.132.34.227)2025111314
nsa5.schlundtech.de (2607:f1c0:fe:53:185:132:34:227)2025111314
nsb5.schlundtech.de (185.132.35.227)2025111314
nsb5.schlundtech.de (2607:f1c0:fe:53:185:132:35:227)2025111314
nsc5.schlundtech.de (217.160.80.227)2025111314
nsc5.schlundtech.de (2001:8d8:fe:53:217:160:80:227)2025111314
nsd5.schlundtech.de (217.160.81.227)2025111314
nsd5.schlundtech.de (2001:8d8:fe:53:217:160:81:227)2025111314

Checks

  • ✓ Serial 2025111314 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 2h, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver nsa5.schlundtech.de is one of the listed nameservers.
  • ✓ Contact paul.steffen@dza.de #25
    The SOA RNAME paul\.steffen.dza.de means paul.steffen@dza.de.
  • ✓ Date-based serial #26
    The serial 2025111314 follows the YYYYMMDDnn convention (2025-11-13).

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

16 records at the apex

Found

Read from
185.132.34.227:53
TypeValueTTL
SOAnsa5.schlundtech.de. paul\.steffen.dza.de. 2025111314 43200 7200 1209600 8640086400
NSnsa5.schlundtech.de.600
NSnsb5.schlundtech.de.600
NSnsd5.schlundtech.de.600
NSnsc5.schlundtech.de.600
A136.243.90.188600
MX10 mail.dza.de.43200
TXT"cisco-ci-domain-verification=1ff1763f102c4244a11883764d3a9de1846bd72a4773568d5147d4c97850fce5"600
TXT"MS=ms92298172"600
TXT"ZOOM_verify_1CehhcrhgnCJnJ20bLC6pA"600
TXT"v=spf1 ip4:136.243.90.168 ip4:136.243.90.188 ip4:136.243.167.152 a:dza.de a:mail.dza.de +mx include:nds-monitoring.de -all"600
TXT"sophos-domain-verification=cc18af716a592a23bd7dc297b85f992bdd12fd09fea83d8818083462b7ac7253"600
TXT"portal-domain: j7nvipkPce73Nl8g"600
TXT"google-site-verification=guywSV0XIR8N-rwD9_q3m7d2RjW7qeWKFU7uWyb63pU"600
TXT"amazon-business-verification=f6b2bd93b0b03c40e5fea09ca4de9d573e1f101c2dc34f9f262ee3206e2e8263"600
TXT"openai-domain-verification=dv-ceRAjFWff33laQJj4uBh3bsw"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 12h, NS 10m. The NS TTL at the parent is 1d and in the zone 10m; 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