berlin-airport.de

Checked 21 October 2026, 21:37 UTC · via 8.8.8.8
!Passed with warnings
20 passed 2 warnings 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

nsb9.schlundtech.de, nsc9.schlundtech.de, nsd9.schlundtech.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
nsb9.schlundtech.de, nsc9.schlundtech.de, nsd9.schlundtech.de
NS in the zone
nsb9.schlundtech.de, nsc9.schlundtech.de, nsd9.schlundtech.de
NameserverAddressesNetwork (AS)Glue
nsb9.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-
nsc9.schlundtech.de217.160.80.227 2001:8d8:fe:53:217:160:80:227AS8560 IONOS-AS - IONOS SE, DE AS8560 IONOS-AS - IONOS SE, DE-
nsd9.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

  • ✓ 3 nameservers #6
    Delegated to nsb9.schlundtech.de, nsc9.schlundtech.de, nsd9.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 3 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS15418 (IONOS-ANYCAST - Fasthosts Internet Limited, GB): 2 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

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
nsb9.schlundtech.de 185.132.35.227NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsb9.schlundtech.de 2607:f1c0:fe:53:185:132:35:227NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsc9.schlundtech.de 217.160.80.227NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsc9.schlundtech.de 2001:8d8:fe:53:217:160:80:227NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsd9.schlundtech.de 217.160.81.227NOERROR, 9 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
nsd9.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 6 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: nsb9.schlundtech.de: "Served by PowerDNS - https://www.powerdns.com/"; nsc9.schlundtech.de: "Served by PowerDNS - https://www.powerdns.com/"; nsd9.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

warn

serial 2018111677 · primary ns1.berlin-airport.de

Found

Primary (MNAME)
ns1.berlin-airport.de
Contact (RNAME)
hostmaster.berlin-airport.de
Serial
2018111677
Refresh / retry
1200 s / 1200 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
nsb9.schlundtech.de (185.132.35.227)2018111677
nsb9.schlundtech.de (2607:f1c0:fe:53:185:132:35:227)2018111677
nsc9.schlundtech.de (217.160.80.227)2018111677
nsc9.schlundtech.de (2001:8d8:fe:53:217:160:80:227)2018111677
nsd9.schlundtech.de (217.160.81.227)2018111677
nsd9.schlundtech.de (2001:8d8:fe:53:217:160:81:227)2018111677

Checks

  • ✓ Serial 2018111677 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    retry 20m should be shorter than refresh 20m. Current values: refresh 20m, retry 20m, expire 14d, negative TTL 1h.
    #23
  • i
    Hidden master
    The primary nameserver ns1.berlin-airport.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@berlin-airport.de #25
    The SOA RNAME hostmaster.berlin-airport.de means hostmaster@berlin-airport.de.
  • ✓ Date-based serial #26
    The serial 2018111677 follows the YYYYMMDDnn convention (2018-11-16).

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

18 records at the apex

Found

Read from
185.132.35.227:53
TypeValueTTL
SOAns1.berlin-airport.de. hostmaster.berlin-airport.de. 2018111677 1200 1200 1209600 3600300
NSnsc9.schlundtech.de.3600
NSnsb9.schlundtech.de.3600
NSnsd9.schlundtech.de.3600
A52.29.127.03600
MX30 mx03.hornetsecurity.com.3600
MX10 mx01.hornetsecurity.com.3600
MX20 mx02.hornetsecurity.com.3600
MX40 mx04.hornetsecurity.com.3600
TXT"figma-domain-verification=cee3fe5942e0bd87957969f2ddf9f85b2af16ce576eff4c9e6a2a3d08da27918-1760349985"3600
TXT"MS=ms70325642"3600
TXT"google-gws-recovery-domain-verification=52614324"3600
TXT"apple-domain-verification=j7hsNJbnZf7rmV19"3600
TXT"d365mktkey=39ecarug8xe4z2t2f7di22say"3600
TXT"_globalsign-domain-verification=pF8xlGkrQelypR3sZAsH4TQ7G_VyM2URxIPHuICi-N"3600
TXT"ZOOM_verify_XJy4hs54Tmu2xuxmFvNGgQ"3600
TXT"v=spf1 ip4:188.40.30.46 ip4:87.225.250.100 include:spf.hornetsecurity.com include:amazonses.com include:SPF.Protection.Outlook.com -all"3600
TXT"google-site-verification=8qDIk_FNx6KOhb8J9hCKzZDlEHaSfib2sRrLIzy7oNo " ""3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 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