leipziger-buchmesse.de

Checked 21 October 2026, 23:11 UTC · via 8.8.8.8
✗Problems found
20 passed 3 warnings 1 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

warn

ns.leipziger-messe.de, ns2.leipziger-messe.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns.leipziger-messe.de, ns2.leipziger-messe.de
NS in the zone
ns.leipziger-messe.de, ns2.leipziger-messe.de
NameserverAddressesNetwork (AS)Glue
ns.leipziger-messe.de195.16.83.220 2a10:9a40:0:2002::220AS35065 LEIPZIGER-MESSE-AS - Leipziger Messe GmbH, DE AS35065 LEIPZIGER-MESSE-AS - Leipziger Messe GmbH, DE195.16.83.220
ns2.leipziger-messe.de217.160.3.225 2a01:239:283:9b00::1AS8560 IONOS-AS - IONOS SE, DE AS6724 STRATO - Strato GmbH, DE82.97.66.20

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns.leipziger-messe.de, ns2.leipziger-messe.de.
    #6
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • !
    Glue differs from the zone
    The addresses at the parent (glue) differ from the addresses in the zone: ns.leipziger-messe.de (glue 195.16.83.220, zone 195.16.83.220, 2a10:9a40:0:2002::220); ns2.leipziger-messe.de (glue 82.97.66.20, zone 217.160.3.225, 2a01:239:283:9b00::1). Update the glue at your registrar.
    #8
  • ✓ 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 2 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS35065 (LEIPZIGER-MESSE-AS - Leipziger Messe GmbH, DE): 2 addresses; AS6724 (STRATO - Strato GmbH, DE): 1 address; AS8560 (IONOS-AS - IONOS SE, DE): 1 address.
  • 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

fail

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.leipziger-messe.de 195.16.83.220NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns.leipziger-messe.de 2a10:9a40:0:2002::220NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns2.leipziger-messe.de 217.160.3.225NOERROR, 13 ms, authoritativenoyes / yesrefused9.18.49-1~deb12u2-Debian
ns2.leipziger-messe.de 2a01:239:283:9b00::1NOERROR, 13 ms, authoritativenono / yesrefused9.18.49-1~deb12u2-Debian

Checks

  • ✓ All respond #14
    All 4 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: ns2.leipziger-messe.de: "9.18.49-1~deb12u2-Debian". Hide or replace the version string.
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns2.leipziger-messe.de (2a01:239:283:9b00::1): dial tcp [2a01:239:283:9b00::1]:53: i/o timeout.
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 202112447 · primary ns.leipziger-messe.de

Found

Primary (MNAME)
ns.leipziger-messe.de
Contact (RNAME)
hostmaster.leipziger-messe.de
Serial
202112447
Refresh / retry
14400 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns.leipziger-messe.de (195.16.83.220)202112447
ns.leipziger-messe.de (2a10:9a40:0:2002::220)202112447
ns2.leipziger-messe.de (217.160.3.225)202112447
ns2.leipziger-messe.de (2a01:239:283:9b00::1)202112447

Checks

  • ✓ Serial 202112447 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 1h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.leipziger-messe.de is one of the listed nameservers.
  • ✓ Contact hostmaster@leipziger-messe.de #25
    The SOA RNAME hostmaster.leipziger-messe.de means hostmaster@leipziger-messe.de.
  • ✓ Counter serial #26
    The serial 202112447 is a plain counter.

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

8 records at the apex

Found

Read from
195.16.83.220:53
TypeValueTTL
SOAns.leipziger-messe.de. hostmaster.leipziger-messe.de. 202112447 14400 3600 604800 8640086400
NSns.leipziger-messe.de.86400
NSns2.leipziger-messe.de.86400
A195.16.80.22186400
MX10 mx-in02.eu.retarus.com.86400
MX10 mx-in01.eu.retarus.com.86400
TXT"v=spf1 ip4:192.166.197.103 include:_spf.retarus.com include:_spf.ntgt.de include:_spf.netigate.se ~all"86400
TXT"google-site-verification=Myug-dfrG6pF_H_IFI-aPDYuhJQHXEfl9fcAqmRNR8g"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.
  • ✓ 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