hs-kl.de

Checked 21 October 2026, 22:51 UTC · via 8.8.8.8
!Passed with warnings
20 passed 4 warnings 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

warn

ns1.domaindiscount24.net, ns2.domaindiscount24.net, ns3.domaindiscount24.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
ns1.domaindiscount24.net, ns2.domaindiscount24.net, ns3.domaindiscount24.net
NS in the zone
ns1.domaindiscount24.net, ns1.hs-kl.de, ns1.key-systems.net, ns2.domaindiscount24.net, ns2.hs-kl.de, ns2.key-systems.net, ns3.domaindiscount24.net, ns3.key-systems.net
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.hs-kl.de (zone only)131.246.122.150 2001:638:208:ef13:250:56ff:fe88:839eAS199578 UNIKL - Rheinland-Pfaelzische Technische Universitaet Kaiserslautern-Landau, DE AS680 DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE-
ns1.key-systems.net (zone only)193.227.117.229 2a04:2b00:14cc::229AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
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.hs-kl.de (zone only)217.198.242.251AS2857 RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE-
ns2.key-systems.net (zone only)194.50.187.229 2a04:2b00:14dd::229AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns3.domaindiscount24.net194.0.182.34 2a04:2b00:14ee::34AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-
ns3.key-systems.net (zone only)194.0.182.229 2a04:2b00:14ee::229AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns1.domaindiscount24.net, ns2.domaindiscount24.net, ns3.domaindiscount24.net.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only in the zone: ns1.hs-kl.de, ns1.key-systems.net, ns2.hs-kl.de, ns2.key-systems.net, ns3.key-systems.net. ns1.domaindiscount24.net, ns1.hs-kl.de, ns1.key-systems.net, ns2.domaindiscount24.net, ns2.hs-kl.de, ns2.key-systems.net, ns3.domaindiscount24.net, ns3.key-systems.net report NS ns1.domaindiscount24.net ns1.hs-kl.de ns1.key-systems.net ns2.domaindiscount24.net ns2.hs-kl.de ns2.key-systems.net ns3.domaindiscount24.net ns3.key-systems.net.
    #7
  • ✓ 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 5 IPv4 /24s and 4 IPv6 /48s.
  • ✓ 4 autonomous systems #11
    The nameservers are spread over: AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 12 addresses; AS199578 (UNIKL - Rheinland-Pfaelzische Technische Universitaet Kaiserslautern-Landau, DE): 1 address; AS2857 (RLP-NET - Johannes Gutenberg-Universitaet Mainz, DE): 1 address; AS680 (DFN - Verein zur Foerderung eines Deutschen Forschungsnetzes e.V., DE): 1 address.
  • i
    All nameserver names under .net
    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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns2.hs-kl.de.
    #13

Nameservers

warn

15 of 15 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, 6 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns1.hs-kl.de 131.246.122.150NOERROR, 7 ms, authoritativenoyes / yesrefused9.20.29-1+ubuntu22.04.1+deb.sury.org+1-Ubuntu
ns1.hs-kl.de 2001:638:208:ef13:250:56ff:fe88:839eNOERROR, 8 ms, authoritativenoyes / yesrefused9.20.29-1+ubuntu22.04.1+deb.sury.org+1-Ubuntu
ns1.key-systems.net 193.227.117.229NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns1.key-systems.net 2a04:2b00:14cc::229NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns2.domaindiscount24.net 194.50.187.34NOERROR, 13 ms, authoritativenoyes / yesrefusedreg-wie1
ns2.domaindiscount24.net 2a04:2b00:14dd::34NOERROR, 14 ms, authoritativenoyes / yesrefusedreg-wie1
ns2.hs-kl.de 217.198.242.251NOERROR, 4 ms, authoritativenoyes / yesrefused9.20.29-1+ubuntu22.04.1+deb.sury.org+1-Ubuntu
ns2.key-systems.net 194.50.187.229NOERROR, 11 ms, authoritativenoyes / yesrefusedreg-wie1
ns2.key-systems.net 2a04:2b00:14dd::229NOERROR, 11 ms, authoritativenoyes / yesrefusedreg-wie1
ns3.domaindiscount24.net 194.0.182.34NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns3.domaindiscount24.net 2a04:2b00:14ee::34NOERROR, 6 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns3.key-systems.net 194.0.182.229NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns3.key-systems.net 2a04:2b00:14ee::229NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS

Checks

  • ✓ All respond #14
    All 15 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.hs-kl.de: "9.20.29-1+ubuntu22.04.1+deb.sury.org+1-Ubuntu"; ns2.hs-kl.de: "9.20.29-1+ubuntu22.04.1+deb.sury.org+1-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

warn

serial 2026081000 · primary ns1.hs-kl.de

Found

Primary (MNAME)
ns1.hs-kl.de
Contact (RNAME)
hostmaster.hs-kl.de
Serial
2026081000
Refresh / retry
3600 s / 3600 s
Expire
3600 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
ns1.domaindiscount24.net (193.227.117.34)2026081000
ns1.domaindiscount24.net (2a04:2b00:14cc::34)2026081000
ns1.hs-kl.de (131.246.122.150)2026081000
ns1.hs-kl.de (2001:638:208:ef13:250:56ff:fe88:839e)2026081000
ns1.key-systems.net (193.227.117.229)2026081000
ns1.key-systems.net (2a04:2b00:14cc::229)2026081000
ns2.domaindiscount24.net (194.50.187.34)2026081000
ns2.domaindiscount24.net (2a04:2b00:14dd::34)2026081000
ns2.hs-kl.de (217.198.242.251)2026081000
ns2.key-systems.net (194.50.187.229)2026081000
ns2.key-systems.net (2a04:2b00:14dd::229)2026081000
ns3.domaindiscount24.net (194.0.182.34)2026081000
ns3.domaindiscount24.net (2a04:2b00:14ee::34)2026081000
ns3.key-systems.net (194.0.182.229)2026081000
ns3.key-systems.net (2a04:2b00:14ee::229)2026081000

Checks

  • ✓ Serial 2026081000 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    retry 1h should be shorter than refresh 1h; expire 1h is shorter than 7d; secondaries stop answering too soon when the primary is down; expire 1h must be longer than refresh + retry. Current values: refresh 1h, retry 1h, expire 1h, negative TTL 15m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.hs-kl.de is one of the listed nameservers.
  • ✓ Contact hostmaster@hs-kl.de #25
    The SOA RNAME hostmaster.hs-kl.de means hostmaster@hs-kl.de.
  • ✓ Date-based serial #26
    The serial 2026081000 follows the YYYYMMDDnn convention (2026-08-10).

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
193.227.117.34:53
TypeValueTTL
SOAns1.hs-kl.de. hostmaster.hs-kl.de. 2026081000 3600 3600 3600 9003600
NSns1.hs-kl.de.3600
NSns1.key-systems.net.3600
NSns1.domaindiscount24.net.3600
NSns2.hs-kl.de.3600
NSns2.key-systems.net.3600
NSns2.domaindiscount24.net.3600
NSns3.key-systems.net.3600
NSns3.domaindiscount24.net.3600
A217.72.195.203600
MX10 mailgate-1.zdv.net.900
MX20 mailgate-2.zdv.net.900
MX30 mailgate-3.zdv.net.900
MX40 mailgate-4.zdv.net.900
TXT"HARICA-eMQZfLNhd4i4V2iaISz"900
TXT"v=spf1 include:zdv.net -all"900

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, MX 15m, 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