gvl.de

Checked 21 October 2026, 22:41 UTC · via 8.8.8.8
!Passed with warnings
24 passed 2 warnings 0 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

info

dns-b1.cronon.de, dns-b2.cronon.de, dns-hh1.cronon.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns-b1.cronon.de, dns-b2.cronon.de, dns-hh1.cronon.de
NS in the zone
dns-b1.cronon.de, dns-b2.cronon.de, dns-hh1.cronon.de
NameserverAddressesNetwork (AS)Glue
dns-b1.cronon.de192.166.192.224 2a01:238:e100:f003::110AS6786 CRONON-BERLIN-AS - Cronon GmbH, DE AS6786 CRONON-BERLIN-AS - Cronon GmbH, DE192.166.192.224 2a01:238:e100:f003::110
dns-b2.cronon.de192.166.196.224 2a01:238:e100:f303::120AS6786 CRONON-BERLIN-AS - Cronon GmbH, DE AS6786 CRONON-BERLIN-AS - Cronon GmbH, DE192.166.196.224 2a01:238:e100:f303::120
dns-hh1.cronon.de81.169.191.16 2a01:238:cca:101::16AS6724 STRATO - Strato GmbH, DE AS6786 CRONON-BERLIN-AS - Cronon GmbH, DE81.169.191.16 2a01:238:cca:101::16

Checks

  • ✓ 3 nameservers #6
    Delegated to dns-b1.cronon.de, dns-b2.cronon.de, dns-hh1.cronon.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: AS6724 (STRATO - Strato GmbH, DE): 1 address; AS6786 (CRONON-BERLIN-AS - Cronon GmbH, DE): 5 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

warn

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns-b1.cronon.de 192.166.192.224NOERROR, 13 ms, authoritativenoyes / yesrefused9.11.36-RedHat-9.11.36-16.el8_10.16
dns-b1.cronon.de 2a01:238:e100:f003::110NOERROR, 13 ms, authoritativenoyes / yesrefused9.11.36-RedHat-9.11.36-16.el8_10.16
dns-b2.cronon.de 192.166.196.224NOERROR, 17 ms, authoritativenoyes / yesrefused9.11.36-RedHat-9.11.36-16.el8_10.16
dns-b2.cronon.de 2a01:238:e100:f303::120NOERROR, 16 ms, authoritativenoyes / yesrefused9.11.36-RedHat-9.11.36-16.el8_10.16
dns-hh1.cronon.de 81.169.191.16NOERROR, 6 ms, authoritativenoyes / yesrefused9.11.36-RedHat-9.11.36-16.el8_10.16
dns-hh1.cronon.de 2a01:238:cca:101::16NOERROR, 6 ms, authoritativenoyes / yesrefused9.11.36-RedHat-9.11.36-16.el8_10.16

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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: dns-b1.cronon.de: "9.11.36-RedHat-9.11.36-16.el8_10.16"; dns-b2.cronon.de: "9.11.36-RedHat-9.11.36-16.el8_10.16"; dns-hh1.cronon.de: "9.11.36-RedHat-9.11.36-16.el8_10.16". 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 2026092401 · primary dns-b1.cronon.de

Found

Primary (MNAME)
dns-b1.cronon.de
Contact (RNAME)
postmaster.cronon.de
Serial
2026092401
Refresh / retry
43200 s / 3600 s
Expire
604800 s
Negative TTL
10800 s

Serial per nameserver

NameserverSerial
dns-b1.cronon.de (192.166.192.224)2026092401
dns-b1.cronon.de (2a01:238:e100:f003::110)2026092401
dns-b2.cronon.de (192.166.196.224)2026092401
dns-b2.cronon.de (2a01:238:e100:f303::120)2026092401
dns-hh1.cronon.de (81.169.191.16)2026092401
dns-hh1.cronon.de (2a01:238:cca:101::16)2026092401

Checks

  • ✓ Serial 2026092401 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 1h, expire 7d, negative TTL 3h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns-b1.cronon.de is one of the listed nameservers.
  • ✓ Contact postmaster@cronon.de #25
    The SOA RNAME postmaster.cronon.de means postmaster@cronon.de.
  • ✓ Date-based serial #26
    The serial 2026092401 follows the YYYYMMDDnn convention (2026-09-24).

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

20 records at the apex

Found

Read from
192.166.192.224:53
TypeValueTTL
SOAdns-b1.cronon.de. postmaster.cronon.de. 2026092401 43200 3600 604800 10800300
NSdns-b2.cronon.de.300
NSdns-b1.cronon.de.300
NSdns-hh1.cronon.de.300
A192.166.195.181300
MX10 mail.gvl.de.300
TXT"v=spf1 ip4:192.166.195.4 include:_spf.dotplex.com include:spf.protection.outlook.com include:_spf.atlassian.net include:amazonses.com ip4:192.166.195.184 ip4:192.166.195.229 ip4:192.166.195.230 include:spf.codepiraten.com ~all"300
TXT"atlassian-domain-verification=Lgv2CKsTW71murAS3kBKftcjYB6nZBG2GnNzbXLUO52Gp1ukG5wwb3vuYhJqFKyY"300
TXT"google-site-verification=xEHnrbNnBGcZdgH7D0EhH-a72dfN2aeQsUOmWQ9ImuM"300
TXT"MS=ms40178858"300
TXT"docusign=4f414aee-4f66-49e7-9862-9785467d41b4"300
TXT"miro-verification=dbdb1becd7434458821ef50dbd7f7a6f9dffc447"300
TXT"17m27j0tfj3m28713gcvwxz1cx6j1gmj"300
TXT"logmein-verification-code=e19eace4-652d-4998-b91e-ab55b0aa9d12"300
TXT"7f2w9w52wjx2k6s41tv13dtcw975kn0x"300
TXT"atlassian-sending-domain-verification=5ff475b4-b0c5-4c01-b82f-58d9f4346756"300
TXT"langdock-verify=gnEjdrJ_d3AQQXrDkCWnupRTyapR3i4uTq0zUW5lsDw"300
TXT"google-site-verification=Yq2shdsLHkTAl_CYclwD4T8wSDq3fR-wp1o4dBYqHiI"300
CAA128 issue "letsencrypt.org"300
CAA128 issue "digicert.com"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 5m. The NS TTL at the parent is 1d and in the zone 5m; 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, digicert.com.