iwkoeln.de

Checked 21 October 2026, 23:00 UTC · via 8.8.8.8
!Passed with warnings
21 passed 2 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

aragorn.ns.cloudflare.com, martha.ns.cloudflare.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
aragorn.ns.cloudflare.com, martha.ns.cloudflare.com
NS in the zone
aragorn.ns.cloudflare.com, martha.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
aragorn.ns.cloudflare.com173.245.59.67 108.162.193.67 172.64.33.67 2803:f800:50::6ca2:c143 2a06:98c1:50::ac40:2143 2606:4700:58::adf5:3b43AS13335 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-
martha.ns.cloudflare.com108.162.194.142 162.159.38.142 172.64.34.142 2a06:98c1:50::ac40:228e 2606:4700:50::a29f:268e 2803:f800:50::6ca2:c28eAS13335 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: aragorn.ns.cloudflare.com, martha.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
aragorn.ns.cloudflare.com 173.245.59.67NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
aragorn.ns.cloudflare.com 108.162.193.67NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
aragorn.ns.cloudflare.com 172.64.33.67NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
aragorn.ns.cloudflare.com 2803:f800:50::6ca2:c143NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
aragorn.ns.cloudflare.com 2a06:98c1:50::ac40:2143NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
aragorn.ns.cloudflare.com 2606:4700:58::adf5:3b43NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
martha.ns.cloudflare.com 108.162.194.142NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
martha.ns.cloudflare.com 162.159.38.142NOERROR, 32 ms, authoritativenoyes / yesrefused2026.10.2
martha.ns.cloudflare.com 172.64.34.142NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
martha.ns.cloudflare.com 2a06:98c1:50::ac40:228eNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
martha.ns.cloudflare.com 2606:4700:50::a29f:268eNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
martha.ns.cloudflare.com 2803:f800:50::6ca2:c28eNOERROR, 15 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: aragorn.ns.cloudflare.com: "2026.10.2"; martha.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 2417976208 · primary aragorn.ns.cloudflare.com

Found

Primary (MNAME)
aragorn.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2417976208
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
aragorn.ns.cloudflare.com (173.245.59.67)2417976208
aragorn.ns.cloudflare.com (108.162.193.67)2417976208
aragorn.ns.cloudflare.com (172.64.33.67)2417976208
aragorn.ns.cloudflare.com (2803:f800:50::6ca2:c143)2417976208
aragorn.ns.cloudflare.com (2a06:98c1:50::ac40:2143)2417976208
aragorn.ns.cloudflare.com (2606:4700:58::adf5:3b43)2417976208
martha.ns.cloudflare.com (108.162.194.142)2417976208
martha.ns.cloudflare.com (162.159.38.142)2417976208
martha.ns.cloudflare.com (172.64.34.142)2417976208
martha.ns.cloudflare.com (2a06:98c1:50::ac40:228e)2417976208
martha.ns.cloudflare.com (2606:4700:50::a29f:268e)2417976208
martha.ns.cloudflare.com (2803:f800:50::6ca2:c28e)2417976208

Checks

  • ✓ Serial 2417976208 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 aragorn.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 2417976208 is a Unix timestamp (2046-08-15 20:03 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

info

19 records at the apex

Found

Read from
173.245.59.67:53
TypeValueTTL
SOAaragorn.ns.cloudflare.com. dns.cloudflare.com. 2417976208 10000 2400 604800 18001800
NSaragorn.ns.cloudflare.com.86400
NSmartha.ns.cloudflare.com.86400
A188.114.96.2300
A188.114.97.2300
AAAA2a06:98c1:3120::2300
AAAA2a06:98c1:3121::2300
MX10 mx1.mas.t-systems-service.com.300
MX20 mx2.mas.t-systems-service.com.300
MX30 mx3.mas.t-systems-service.com.300
TXT"201712141416045uyjvkj5xn41l2usoc381vrf7d3xz85whzsn1v3kqpsra7fqkk"300
TXT"DBDAA6EF044D9C98596D5E19F0A712E66805CC23"300
TXT"X/ZeVzL7IhK6TSKlO3Kw3dug2Xzslbq2WdKEa/2YtkYYx4aOqWOs+yQo21J4TcOFuoI5xwPERNtZXDojla+rQw=="300
TXT"apple-domain-verification=tGiIYiXI0xJvPAfO"300
TXT"atlassian-domain-verification=uPRmh1XxvV032a8zKbaxvNI0ZnojyP6cXHYoYFCTHaM9sPli8fciIsGXz6yBzz1t"300
TXT"google-site-verification=vwZaS5UefEAQ3Tsxbh_CqJPxhoE0VT2L3HwFQc4C_9U"300
TXT"langdock-verify=vBbNAT2zZTpb6vQEW3i-00g2sRoRrTr7MbuVw7J8PWk"300
TXT"linkedin-site-verification=351659d6-e7ea-4a8a-b732-7fa4481f4a93"300
TXT"v=spf1 a:spf.mas.t-systems-service.com a:k60828.coveto.de include:spf.mailjet.com ip4:87.79.12.44 ip4:87.79.12.45 ip4:89.1.85.243 ip4:176.9.21.28 ip4:212.114.35.242 ip4:212.114.34.232 ip4:212.114.34.50 ip4:212.114.35.226 ip4:85.13.129.239 ip4:172.16.244.1" "30" " ip4:87.79.12.40 ip4:172.16.244.15 ip4:79.142.32.16 ip4:85.13.144.213 include:sendgrid.net include:spf.protection.outlook.com include:spf.crsend.com include:_spf.recruiting-portal.com include:spf.orbit.teamleader.eu include:_spf.zimpel.de -all"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 5m, NS 1d.
  • ✓ 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