ruhr24.de

Checked 22 October 2026, 00:01 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

info

cory.ns.cloudflare.com, tricia.ns.cloudflare.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
cory.ns.cloudflare.com, tricia.ns.cloudflare.com
NS in the zone
cory.ns.cloudflare.com, tricia.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
cory.ns.cloudflare.com108.162.193.93 172.64.33.93 173.245.59.93 2606:4700:58::adf5:3b5d 2803:f800:50::6ca2:c15d 2a06:98c1:50::ac40:215dAS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US-
tricia.ns.cloudflare.com172.64.32.232 108.162.192.232 173.245.58.232 2803:f800:50::6ca2:c0e8 2a06:98c1:50::ac40:20e8 2606:4700:50::adf5:3ae8AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: cory.ns.cloudflare.com, tricia.ns.cloudflare.com.
    #6
  • ✓ 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 6 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 12 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 .com
    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

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
cory.ns.cloudflare.com 108.162.193.93NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
cory.ns.cloudflare.com 172.64.33.93NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
cory.ns.cloudflare.com 173.245.59.93NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
cory.ns.cloudflare.com 2606:4700:58::adf5:3b5dNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
cory.ns.cloudflare.com 2803:f800:50::6ca2:c15dNOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
cory.ns.cloudflare.com 2a06:98c1:50::ac40:215dNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
tricia.ns.cloudflare.com 172.64.32.232NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
tricia.ns.cloudflare.com 108.162.192.232NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
tricia.ns.cloudflare.com 173.245.58.232NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
tricia.ns.cloudflare.com 2803:f800:50::6ca2:c0e8NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
tricia.ns.cloudflare.com 2a06:98c1:50::ac40:20e8NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
tricia.ns.cloudflare.com 2606:4700:50::adf5:3ae8NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2

Checks

  • ✓ All respond #14
    All 12 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: cory.ns.cloudflare.com: "2026.10.2"; tricia.ns.cloudflare.com: "2026.10.2". 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 2414922044 · primary cory.ns.cloudflare.com

Found

Primary (MNAME)
cory.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2414922044
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
cory.ns.cloudflare.com (108.162.193.93)2414922044
cory.ns.cloudflare.com (172.64.33.93)2414922044
cory.ns.cloudflare.com (173.245.59.93)2414922044
cory.ns.cloudflare.com (2606:4700:58::adf5:3b5d)2414922044
cory.ns.cloudflare.com (2803:f800:50::6ca2:c15d)2414922044
cory.ns.cloudflare.com (2a06:98c1:50::ac40:215d)2414922044
tricia.ns.cloudflare.com (172.64.32.232)2414922044
tricia.ns.cloudflare.com (108.162.192.232)2414922044
tricia.ns.cloudflare.com (173.245.58.232)2414922044
tricia.ns.cloudflare.com (2803:f800:50::6ca2:c0e8)2414922044
tricia.ns.cloudflare.com (2a06:98c1:50::ac40:20e8)2414922044
tricia.ns.cloudflare.com (2606:4700:50::adf5:3ae8)2414922044

Checks

  • ✓ Serial 2414922044 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h46m40s, retry 40m, expire 7d, negative TTL 30m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver cory.ns.cloudflare.com is one of the listed nameservers.
  • ✓ Contact dns@cloudflare.com #25
    The SOA RNAME dns.cloudflare.com means dns@cloudflare.com.
  • ✓ Timestamp serial #26
    The serial 2414922044 is a Unix timestamp (2046-07-11 11:40 UTC).

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

warn

17 records at the apex

Found

Read from
108.162.193.93:53
TypeValueTTL
SOAcory.ns.cloudflare.com. dns.cloudflare.com. 2414922044 10000 2400 604800 18001800
NScory.ns.cloudflare.com.86400
NStricia.ns.cloudflare.com.86400
A91.234.30.217120
MX10 ruhr24-de.mail.protection.outlook.com.300
TXT"MS=ms57099380"300
TXT"anthropic-domain-verification-662cj8=yZMhGOrtnKtTfhPdX1LL3CvOB"300
TXT"atlassian-domain-verification=tDFMazecNiuJuDZNOku8KOvKneIO6HAHS4iR6l4tqKpaco0qpp6R7s2einw73Rui"300
TXT"cKyoYF2hAdT7UgFa2BgSUQfCKNOzmNr6RYl1PmeYeGUBKVXjW2orvtDCuDR9w7671cyTwA0cyZMfLTQcY2Gexg=="300
TXT"canva-site-verification=a4MliHMaCRhtAwM4LkKxZg"300
TXT"google-site-verification=0_hacS-D04X2_knDr5M6QAPemWkkkvyazzsWowkmt58"300
TXT"google-site-verification=40QsXRso8yqI3HpPs9KVbW0BWQdyJ9jF9zDdL1guWHY"300
TXT"google-site-verification=HZpLXDz3r7bHsCDDnS0t8U6PbGPiCykq01_Q4uM5sig"300
TXT"google-site-verification=JI6CwfWL-Ja3NQi-40hm0NDXsn3nPonkK1PvO1W3UC8"300
TXT"google-site-verification=aL_gTWp-vGfYGevc19Dp5wfRlV97mEJiw0Kpsi2aFrA"300
TXT"openai-domain-verification=dv-9b1mmgWRCHv0hS4OT29NcroS"300
TXT"v=spf1 a ip4:185.245.99.152 ip4:80.148.46.132 include:spf.nl2go.com include:spf.protection.outlook.com -all"300

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (2m). Low TTLs are useful just before a planned change.
    #32
  • ✓ 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