izzysoft.de

Checked 21 October 2026, 23:00 UTC · via 8.8.8.8
✗Problems found
22 passed 3 warnings 1 failed 3 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

horeb.izzysoft.de, ns.z3c.net, ns3.z3c.net, ns5.z3c.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
horeb.izzysoft.de, ns.z3c.net, ns3.z3c.net, ns5.z3c.net
NS in the zone
horeb.izzysoft.de, ns.z3c.net, ns3.z3c.net, ns5.z3c.net
NameserverAddressesNetwork (AS)Glue
horeb.izzysoft.de144.76.109.57AS24940 HETZNER-AS - Hetzner Online GmbH, DE144.76.109.57
ns.z3c.net213.239.209.39AS24940 HETZNER-AS - Hetzner Online GmbH, DE-
ns3.z3c.net65.21.156.38AS24940 HETZNER-AS - Hetzner Online GmbH, DE-
ns5.z3c.net136.243.18.157AS24940 HETZNER-AS - Hetzner Online GmbH, DE-

Checks

  • ✓ 4 nameservers #6
    Delegated to horeb.izzysoft.de, ns.z3c.net, ns3.z3c.net, ns5.z3c.net.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: horeb.izzysoft.de.
  • ✓ 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 0 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS24940 (HETZNER-AS - Hetzner Online GmbH, DE): 4 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

fail

3 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
horeb.izzysoft.de 144.76.109.57NOERROR, 3 ms, authoritativenoyes / yesrefusedhidden
ns.z3c.net 213.239.209.39NOERROR, 0 ms, authoritativenoyes / yesrefused9.18.49
ns3.z3c.net 65.21.156.38no responsenono / no--
ns5.z3c.net 136.243.18.157NOERROR, 2 ms, authoritativenoyes / yesrefused9.18.49

Checks

  • ✗
    Nameservers not responding
    These addresses did not answer, so resolvers waste time on timeouts: ns3.z3c.net (65.21.156.38): read udp 46.225.38.91:39700->65.21.156.38:53: read: connection refused.
    #14
  • ✓ 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: ns.z3c.net: "9.18.49"; ns5.z3c.net: "9.18.49". 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 2025030201 · primary horeb.izzysoft.de

Found

Primary (MNAME)
horeb.izzysoft.de
Contact (RNAME)
hostmaster.izzysoft.de
Serial
2025030201
Refresh / retry
86400 s / 3600 s
Expire
2419200 s
Negative TTL
10800 s

Serial per nameserver

NameserverSerial
horeb.izzysoft.de (144.76.109.57)2025030201
ns.z3c.net (213.239.209.39)2025030201
ns5.z3c.net (136.243.18.157)2025030201

Checks

  • ✓ Serial 2025030201 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1d, retry 1h, expire 28d, negative TTL 3h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver horeb.izzysoft.de is one of the listed nameservers.
  • ✓ Contact hostmaster@izzysoft.de #25
    The SOA RNAME hostmaster.izzysoft.de means hostmaster@izzysoft.de.
  • ✓ Date-based serial #26
    The serial 2025030201 follows the YYYYMMDDnn convention (2025-03-02).

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

pass

10 records at the apex

Found

Read from
144.76.109.57:53
TypeValueTTL
SOAhoreb.izzysoft.de. hostmaster.izzysoft.de. 2025030201 86400 3600 2419200 1080043200
NSns.z3c.net.43200
NSns3.z3c.net.43200
NShoreb.izzysoft.de.43200
NSns5.z3c.net.43200
A144.76.109.5843200
MX10 jona.qumran.org.43200
MX90 mail.bsn.com.43200
TXT"v=spf1 mx a a:horeb.qumran.org a:mail21.ibu.de a:rabe.ibu.de a:ns.bsn.com a:jona.qumran.org a:hosted.mailcow.de ip4:213.239.209.39 -all"43200
CAA0 issue "letsencrypt.org"43200

Checks

  • ✓ TTLs within range #32
    TTLs: A 12h, MX 12h, NS 12h. The NS TTL at the parent is 1d and in the zone 12h; 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: letsencrypt.org.