ssv-jahn.de

Checked 22 October 2026, 00:30 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

nsa1.schlundtech.de, nsb1.schlundtech.de, nsc1.schlundtech.de, nsd1.schlundtech.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
nsa1.schlundtech.de, nsb1.schlundtech.de, nsc1.schlundtech.de, nsd1.schlundtech.de
NS in the zone
nsa1.schlundtech.de, nsb1.schlundtech.de, nsc1.schlundtech.de, nsd1.schlundtech.de
NameserverAddressesNetwork (AS)Glue
nsa1.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-
nsb1.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-
nsc1.schlundtech.de217.160.80.227 2001:8d8:fe:53:217:160:80:227AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE-
nsd1.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 nsa1.schlundtech.de, nsb1.schlundtech.de, nsc1.schlundtech.de, nsd1.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
nsa1.schlundtech.de 185.132.34.227NOERROR, 4 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsa1.schlundtech.de 2607:f1c0:fe:53:185:132:34:227NOERROR, 4 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsb1.schlundtech.de 185.132.35.227NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsb1.schlundtech.de 2607:f1c0:fe:53:185:132:35:227NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsc1.schlundtech.de 217.160.80.227NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsc1.schlundtech.de 2001:8d8:fe:53:217:160:80:227NOERROR, 10 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsd1.schlundtech.de 217.160.81.227NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsd1.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 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: nsa1.schlundtech.de: "Served by PowerDNS - https://www.powerdns.com/"; nsb1.schlundtech.de: "Served by PowerDNS - https://www.powerdns.com/"; nsc1.schlundtech.de: "Served by PowerDNS - https://www.powerdns.com/"; nsd1.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 2026011413 · primary nsa1.schlundtech.de

Found

Primary (MNAME)
nsa1.schlundtech.de
Contact (RNAME)
hostmaster.conceptnet.de
Serial
2026011413
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
nsa1.schlundtech.de (185.132.34.227)2026011413
nsa1.schlundtech.de (2607:f1c0:fe:53:185:132:34:227)2026011413
nsb1.schlundtech.de (185.132.35.227)2026011413
nsb1.schlundtech.de (2607:f1c0:fe:53:185:132:35:227)2026011413
nsc1.schlundtech.de (217.160.80.227)2026011413
nsc1.schlundtech.de (2001:8d8:fe:53:217:160:80:227)2026011413
nsd1.schlundtech.de (217.160.81.227)2026011413
nsd1.schlundtech.de (2001:8d8:fe:53:217:160:81:227)2026011413

Checks

  • ✓ Serial 2026011413 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver nsa1.schlundtech.de is one of the listed nameservers.
  • ✓ Contact hostmaster@conceptnet.de #25
    The SOA RNAME hostmaster.conceptnet.de means hostmaster@conceptnet.de.
  • ✓ Date-based serial #26
    The serial 2026011413 follows the YYYYMMDDnn convention (2026-01-14).

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

12 records at the apex

Found

Read from
185.132.34.227:53
TypeValueTTL
SOAnsa1.schlundtech.de. hostmaster.conceptnet.de. 2026011413 28800 7200 604800 36003600
NSnsb1.schlundtech.de.3600
NSnsc1.schlundtech.de.3600
NSnsa1.schlundtech.de.3600
NSnsd1.schlundtech.de.3600
A162.55.254.1933600
AAAA2a01:4f8:1061:13a8::23600
MX10 aspmx.l.google.com.3600
MX20 alt1.aspmx.l.google.com.3600
TXT"v=spf1 ip4:212.77.185.0/24 ip6:2001:16e0:104:3::/64 ip6:2001:16e0:104:4::/64 include:_spf.google.com include:spf.nl2go.com include:spf.mailjet.com include:_spf.lms-sport.de ~all"3600
TXT"cisco-ci-domain-verification=69bf8034bcf912df758a27186e14fd73517180f8ca4ff63b34b3b8da765951e4"3600
TXT"domainVerification=0ddf3019-3446-4b2b-b2e1-6366cf98350a"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.
  • ✓ 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