deutschlandradiokultur.de

Checked 21 October 2026, 22:13 UTC · via 8.8.8.8
!Passed with warnings
24 passed 1 warning 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

pass

auth1.dns.cogentco.com, auth2.dns.cogentco.com, ns1.vodafone-ip.de, ns2.vodafone-ip.de

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
auth1.dns.cogentco.com, auth2.dns.cogentco.com, ns1.vodafone-ip.de, ns2.vodafone-ip.de
NS in the zone
auth1.dns.cogentco.com, auth2.dns.cogentco.com, ns1.vodafone-ip.de, ns2.vodafone-ip.de
NameserverAddressesNetwork (AS)Glue
auth1.dns.cogentco.com66.28.0.14 2001:550:1:a::dAS174 COGENT-174 - Cogent Communications, LLC, US AS174 COGENT-174 - Cogent Communications, LLC, US-
auth2.dns.cogentco.com66.28.0.30 2001:550:1:b::dAS174 COGENT-174 - Cogent Communications, LLC, US AS174 COGENT-174 - Cogent Communications, LLC, US-
ns1.vodafone-ip.de145.253.2.144 2a01:860:0:202::53AS3209 VODANET - Vodafone GmbH, DE AS3209 VODANET - Vodafone GmbH, DE145.253.2.144 2a01:860:0:202::53
ns2.vodafone-ip.de145.253.3.16 2a01:860:0:203::53AS3209 VODANET - Vodafone GmbH, DE AS3209 VODANET - Vodafone GmbH, DE145.253.3.16 2a01:860:0:203::53

Checks

  • ✓ 4 nameservers #6
    Delegated to auth1.dns.cogentco.com, auth2.dns.cogentco.com, ns1.vodafone-ip.de, ns2.vodafone-ip.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: AS174 (COGENT-174 - Cogent Communications, LLC, US): 4 addresses; AS3209 (VODANET - Vodafone GmbH, DE): 4 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .com, .de.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
auth1.dns.cogentco.com 66.28.0.14NOERROR, 10 ms, authoritativenoyes / yesrefusedCogent_DNS
auth1.dns.cogentco.com 2001:550:1:a::dNOERROR, 10 ms, authoritativenoyes / yesrefusedCogent_DNS
auth2.dns.cogentco.com 66.28.0.30NOERROR, 10 ms, authoritativenoyes / yesrefusedCogent_DNS
auth2.dns.cogentco.com 2001:550:1:b::dNOERROR, 6 ms, authoritativenoyes / yesrefusedCogent_DNS
ns1.vodafone-ip.de 145.253.2.144NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns1.vodafone-ip.de 2a01:860:0:202::53NOERROR, 5 ms, authoritativenoyes / yesrefused-
ns2.vodafone-ip.de 145.253.3.16NOERROR, 12 ms, authoritativenoyes / yesrefused-
ns2.vodafone-ip.de 2a01:860:0:203::53NOERROR, 12 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 8 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: auth1.dns.cogentco.com: "Cogent_DNS"; auth2.dns.cogentco.com: "Cogent_DNS".
    #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 2026031300 · primary ns1.vodafone-ip.de

Found

Primary (MNAME)
ns1.vodafone-ip.de
Contact (RNAME)
systemtechnik.dradio.de
Serial
2026031300
Refresh / retry
21600 s / 3600 s
Expire
1209600 s
Negative TTL
21600 s

Serial per nameserver

NameserverSerial
auth1.dns.cogentco.com (66.28.0.14)2026031300
auth1.dns.cogentco.com (2001:550:1:a::d)2026031300
auth2.dns.cogentco.com (66.28.0.30)2026031300
auth2.dns.cogentco.com (2001:550:1:b::d)2026031300
ns1.vodafone-ip.de (145.253.2.144)2026031300
ns1.vodafone-ip.de (2a01:860:0:202::53)2026031300
ns2.vodafone-ip.de (145.253.3.16)2026031300
ns2.vodafone-ip.de (2a01:860:0:203::53)2026031300

Checks

  • ✓ Serial 2026031300 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 6h, retry 1h, expire 14d, negative TTL 6h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.vodafone-ip.de is one of the listed nameservers.
  • ✓ Contact systemtechnik@dradio.de #25
    The SOA RNAME systemtechnik.dradio.de means systemtechnik@dradio.de.
  • ✓ Date-based serial #26
    The serial 2026031300 follows the YYYYMMDDnn convention (2026-03-13).

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

14 records at the apex

Found

Read from
66.28.0.14:53
TypeValueTTL
SOAns1.vodafone-ip.de. systemtechnik.dradio.de. 2026031300 21600 3600 1209600 21600900
NSauth1.dns.cogentco.com.21600
NSns2.vodafone-ip.de.21600
NSns1.vodafone-ip.de.21600
NSauth2.dns.cogentco.com.21600
A34.117.206.250300
MX10 mx01.hornetsecurity.com.21600
MX30 mx03.hornetsecurity.com.21600
MX20 mx02.hornetsecurity.com.21600
MX40 mx04.hornetsecurity.com.21600
TXT"v=spf1 ip4:194.31.115.21 IP4:194.31.114.169 IP4:194.31.122.169 mx include:antispameurope.com ~all"21600
TXT"MS=ms11238755"21600
TXT"5c2t7dn8f6y4kgs9z5xgmcgtkwjfbwvb"21600
TXT"google-site-verification=SuMj533ageSLGVIfVQbQFfBqCi-6ujpQHXO_uE7cGCg"21600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 6h, NS 6h. The NS TTL at the parent is 1d and in the zone 6h; 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