coburg.de

Checked 21 October 2026, 22:10 UTC · via 8.8.8.8
!Passed with warnings
20 passed 3 warnings 0 failed 6 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

dns1.dacor.de, dns2.dacor.de, dns3.dacor.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.dacor.de, dns2.dacor.de, dns3.dacor.de
NS in the zone
dns1.dacor.de, dns2.dacor.de, dns3.dacor.de
NameserverAddressesNetwork (AS)Glue
dns1.dacor.de217.24.56.37 2a00:9d80:9000:6::1AS28876 SUEC-DACOR-AS - suec // dacor GmbH, DE AS28876 SUEC-DACOR-AS - suec // dacor GmbH, DE217.24.56.38 2a00:9d80:9000:6::1
dns2.dacor.de217.24.50.38 2a00:9d80:9000:6::2AS28876 SUEC-DACOR-AS - suec // dacor GmbH, DE AS28876 SUEC-DACOR-AS - suec // dacor GmbH, DE217.24.50.38 2a00:9d80:9000:6::2
dns3.dacor.de185.53.218.38 2a00:9d80:9000:6::3AS28876 SUEC-DACOR-AS - suec // dacor GmbH, DE AS28876 SUEC-DACOR-AS - suec // dacor GmbH, DE185.53.218.38 2a00:9d80:9000:6::3

Checks

  • ✓ 3 nameservers #6
    Delegated to dns1.dacor.de, dns2.dacor.de, dns3.dacor.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: dns1.dacor.de (glue 217.24.56.38, 2a00:9d80:9000:6::1, zone 217.24.56.37, 2a00:9d80:9000:6::1). Update the glue at your registrar.
    #8
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • i
    One address family in one network
    all IPv6 addresses are in 2a00:9d80:9000::/48, while the other address family is spread over several networks.
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS28876 (SUEC-DACOR-AS - suec // dacor GmbH, DE): 6 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • 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
dns1.dacor.de 217.24.56.37NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.8.2 (built Sep 7 2023 07:27:46 by root@localhost)
dns1.dacor.de 2a00:9d80:9000:6::1NOERROR, 4 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.3.0-alpha1.70.master.ga9d432dc0 (built Jan 7 2020 19:25:58 by root@047221da0342)
dns2.dacor.de 217.24.50.38NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.3.0-alpha1.70.master.ga9d432dc0 (built Jan 7 2020 19:25:58 by root@047221da0342)
dns2.dacor.de 2a00:9d80:9000:6::2NOERROR, 4 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.3.0-alpha1.70.master.ga9d432dc0 (built Jan 7 2020 19:25:58 by root@047221da0342)
dns3.dacor.de 185.53.218.38NOERROR, 7 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.8.2 (built Sep 7 2023 07:27:46 by root@localhost)
dns3.dacor.de 2a00:9d80:9000:6::3NOERROR, 3 ms, authoritativenoyes / yesrefusedPowerDNS Authoritative Server 4.3.0-alpha1.70.master.ga9d432dc0 (built Jan 7 2020 19:25:58 by root@047221da0342)

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: dns1.dacor.de: "PowerDNS Authoritative Server 4.8.2 (built Sep 7 2023 07:27:46 by root@localhost)"; dns1.dacor.de: "PowerDNS Authoritative Server 4.3.0-alpha1.70.master.ga9d432dc0 (built Jan 7 2020 19:25:58 by root@047221da0342)"; dns2.dacor.de: "PowerDNS Authoritative Server 4.3.0-alpha1.70.master.ga9d432dc0 (built Jan 7 2020 19:25:58 by root@047221da0342)"; dns3.dacor.de: "PowerDNS Authoritative Server 4.8.2 (built Sep 7 2023 07:27:46 by root@localhost)"; dns3.dacor.de: "PowerDNS Authoritative Server 4.3.0-alpha1.70.master.ga9d432dc0 (built Jan 7 2020 19:25:58 by root@047221da0342)". 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 2026090408 · primary dns1.dacor.de

Found

Primary (MNAME)
dns1.dacor.de
Contact (RNAME)
info.dacor.de
Serial
2026090408
Refresh / retry
14400 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns1.dacor.de (217.24.56.37)2026090408
dns1.dacor.de (2a00:9d80:9000:6::1)2026090408
dns2.dacor.de (217.24.50.38)2026090408
dns2.dacor.de (2a00:9d80:9000:6::2)2026090408
dns3.dacor.de (185.53.218.38)2026090408
dns3.dacor.de (2a00:9d80:9000:6::3)2026090408

Checks

  • ✓ Serial 2026090408 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 dns1.dacor.de is one of the listed nameservers.
  • ✓ Contact info@dacor.de #25
    The SOA RNAME info.dacor.de means info@dacor.de.
  • ✓ Date-based serial #26
    The serial 2026090408 follows the YYYYMMDDnn convention (2026-09-04).

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

7 records at the apex

Found

Read from
217.24.56.37:53
TypeValueTTL
SOAdns1.dacor.de. info.dacor.de. 2026090408 14400 3600 604800 8640086400
NSdns1.dacor.de.14400
NSdns3.dacor.de.14400
NSdns2.dacor.de.14400
A84.19.173.32300
MX10 mail.coburg.de.1200
TXT"v=spf1 mx a:mail2.coburg.de -all"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 20m, NS 4h. The NS TTL at the parent is 1d and in the zone 4h; 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