jena.de

Checked 21 October 2026, 23:01 UTC · via 8.8.8.8
!Passed with warnings
22 passed 3 warnings 0 failed 4 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

ns1.domaindiscount24.net, ns1.jena.de, ns2.domaindiscount24.net, ns2.jena.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.domaindiscount24.net, ns1.jena.de, ns2.domaindiscount24.net, ns2.jena.de
NS in the zone
ns1.domaindiscount24.net, ns1.jena.de, ns2.domaindiscount24.net, ns2.jena.de
NameserverAddressesNetwork (AS)Glue
ns1.domaindiscount24.net193.227.117.34 2a04:2b00:14cc::34AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns1.jena.de195.37.112.228 2001:638:925:7::9AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE195.37.112.228
ns2.domaindiscount24.net194.50.187.34 2a04:2b00:14dd::34AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns2.jena.de83.135.51.13AS8881 VERSATEL - 1&1 Versatel GmbH, DE83.135.51.13

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.domaindiscount24.net, ns1.jena.de, ns2.domaindiscount24.net, ns2.jena.de.
  • ✓ 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: ns1.jena.de (glue 195.37.112.228, zone 195.37.112.228, 2001:638:925:7::9). 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 4 IPv4 /24s and 3 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 4 addresses; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 2 addresses; AS8881 (VERSATEL - 1&1 Versatel GmbH, DE): 1 address.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns2.jena.de.
    #13

Nameservers

warn

7 of 7 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.domaindiscount24.net 193.227.117.34NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns1.domaindiscount24.net 2a04:2b00:14cc::34NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns1.jena.de 195.37.112.228NOERROR, 12 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.24.04.8-Ubuntu
ns1.jena.de 2001:638:925:7::9NOERROR, 13 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.24.04.8-Ubuntu
ns2.domaindiscount24.net 194.50.187.34NOERROR, 12 ms, authoritativenoyes / yesrefusedreg-wie1
ns2.domaindiscount24.net 2a04:2b00:14dd::34NOERROR, 13 ms, authoritativenoyes / yesrefusedreg-wie1
ns2.jena.de 83.135.51.13NOERROR, 25 ms, authoritativenoyes / yesrefused9.18.39-0ubuntu0.24.04.7-Ubuntu

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: ns1.jena.de: "9.18.39-0ubuntu0.24.04.8-Ubuntu"; ns2.jena.de: "9.18.39-0ubuntu0.24.04.7-Ubuntu". Hide or replace the version string.
    #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 2026102102 · primary ns1.jena.de

Found

Primary (MNAME)
ns1.jena.de
Contact (RNAME)
dns-admin.jena.de
Serial
2026102102
Refresh / retry
3600 s / 900 s
Expire
604800 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
ns1.domaindiscount24.net (193.227.117.34)2026102102
ns1.domaindiscount24.net (2a04:2b00:14cc::34)2026102102
ns1.jena.de (195.37.112.228)2026102102
ns1.jena.de (2001:638:925:7::9)2026102102
ns2.domaindiscount24.net (194.50.187.34)2026102102
ns2.domaindiscount24.net (2a04:2b00:14dd::34)2026102102
ns2.jena.de (83.135.51.13)2026102102

Checks

  • ✓ Serial 2026102102 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 15m, expire 7d, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.jena.de is one of the listed nameservers.
  • ✓ Contact dns-admin@jena.de #25
    The SOA RNAME dns-admin.jena.de means dns-admin@jena.de.
  • ✓ Date-based serial #26
    The serial 2026102102 follows the YYYYMMDDnn convention (2026-10-21).

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
193.227.117.34:53
TypeValueTTL
SOAns1.jena.de. dns-admin.jena.de. 2026102102 3600 900 604800 6003600
NSns1.jena.de.3600
NSns1.domaindiscount24.net.3600
NSns2.jena.de.3600
NSns2.domaindiscount24.net.3600
A195.37.112.1623600
MX10 mailrelay-dmz01.jena.de.3600
TXT"MS=ms37375942"3600
TXT"apple-domain-verification=GRdTEWFzJur8A573"3600
TXT"apple-domain-verification=nPm2tbCd0zhUVXZy"3600
TXT"google-site-verification=vk9eTFvxM5Ovrhydy-Ofo3EsVNda6PNDZmZBVHaOqrA"3600
TXT"v=spf1 mx ip4:195.37.112.128/25 ip4:83.135.51.10 ip4:145.245.134.182 ip4:145.245.143.183 ip4:213.239.218.207 ip4:185.189.236.237 ip4:94.135.230.170 a:mx4.eventim.de ip4:194.49.92.240 ip4:188.94.249.240/28 ip4:81.109.161.67 ip4:178.16.56.32/27 -all"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.
  • ✓ 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