3cx.de

Checked 21 October 2026, 21:27 UTC · via 8.8.8.8
!Passed with warnings
22 passed 2 warnings 0 failed 5 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

alina.ns.cloudflare.com, augustus.ns.cloudflare.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
alina.ns.cloudflare.com, augustus.ns.cloudflare.com
NS in the zone
alina.ns.cloudflare.com, augustus.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
alina.ns.cloudflare.com172.64.32.61 108.162.192.61 173.245.58.61 2a06:98c1:50::ac40:203d 2803:f800:50::6ca2:c03d 2606:4700:50::adf5:3a3dAS13335 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-
augustus.ns.cloudflare.com172.64.35.2 108.162.195.2 162.159.44.2 2803:f800:50::6ca2:c302 2606:4700:58::a29f:2c02 2a06:98c1:50::ac40:2302AS13335 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: alina.ns.cloudflare.com, augustus.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
alina.ns.cloudflare.com 172.64.32.61NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
alina.ns.cloudflare.com 108.162.192.61NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
alina.ns.cloudflare.com 173.245.58.61NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
alina.ns.cloudflare.com 2a06:98c1:50::ac40:203dNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
alina.ns.cloudflare.com 2803:f800:50::6ca2:c03dNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
alina.ns.cloudflare.com 2606:4700:50::adf5:3a3dNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
augustus.ns.cloudflare.com 172.64.35.2NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
augustus.ns.cloudflare.com 108.162.195.2NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
augustus.ns.cloudflare.com 162.159.44.2NOERROR, 32 ms, authoritativenoyes / yesrefused2026.10.2
augustus.ns.cloudflare.com 2803:f800:50::6ca2:c302NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
augustus.ns.cloudflare.com 2606:4700:58::a29f:2c02NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
augustus.ns.cloudflare.com 2a06:98c1:50::ac40:2302NOERROR, 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: alina.ns.cloudflare.com: "2026.10.2"; augustus.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 2418103280 · primary alina.ns.cloudflare.com

Found

Primary (MNAME)
alina.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2418103280
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
alina.ns.cloudflare.com (172.64.32.61)2418103280
alina.ns.cloudflare.com (108.162.192.61)2418103280
alina.ns.cloudflare.com (173.245.58.61)2418103280
alina.ns.cloudflare.com (2a06:98c1:50::ac40:203d)2418103280
alina.ns.cloudflare.com (2803:f800:50::6ca2:c03d)2418103280
alina.ns.cloudflare.com (2606:4700:50::adf5:3a3d)2418103280
augustus.ns.cloudflare.com (172.64.35.2)2418103280
augustus.ns.cloudflare.com (108.162.195.2)2418103280
augustus.ns.cloudflare.com (162.159.44.2)2418103280
augustus.ns.cloudflare.com (2803:f800:50::6ca2:c302)2418103280
augustus.ns.cloudflare.com (2606:4700:58::a29f:2c02)2418103280
augustus.ns.cloudflare.com (2a06:98c1:50::ac40:2302)2418103280

Checks

  • ✓ Serial 2418103280 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 alina.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 2418103280 is a Unix timestamp (2046-08-17 07:21 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

pass

26 records at the apex

Found

Read from
172.64.32.61:53
TypeValueTTL
SOAalina.ns.cloudflare.com. dns.cloudflare.com. 2418103280 10000 2400 604800 18001800
NSalina.ns.cloudflare.com.86400
NSaugustus.ns.cloudflare.com.86400
A172.64.153.68300
A104.18.34.188300
AAAA2a06:98c1:3104::6812:22bc300
AAAA2a06:98c1:3100::ac40:9944300
MX10 aspmx.l.google.com.3600
MX20 alt1.aspmx.l.google.com.3600
TXT"MS=A1DE99DED9842564FAAF567ED65274746F37A309"300
TXT"google-site-verification=cNcFYN3sRKfpIYJeKALMx5qtr_Yx-Ljulm8-vVtkrdQ"300
TXT"google-site-verification=kWmccKv0M2VP3tXdWI0okSN5Uqo9brmLFZC96mYQ5xw"300
TXT"rovag_verification_token=FB7A0A86457249B7A28DDEDBF760CB00"300
TXT"v=spf1 ip4:35.190.247.0/24 ip4:64.233.160.0/19 ip4:66.102.0.0/20 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:74.125.0.0/16 ip4:108.177.8.0/21 ip4:173.194.0.0/16 ip4:209.85.128.0/17 ip4:216.58.192.0/19 ip4:216.239.32.0/19 ip6:2001:4860:4000::/36 ip6:2404:680" "0:4000::/36 ip6:2607:f8b0:4000::/36 include:spfb.3cx.de include:spfa.3cx.de -all"300
CAA0 iodef "mailto:webmaster@3cx.com"300
CAA0 issue "comodoca.com"300
CAA0 issue "digicert.com; cansignhttpexchanges=yes"300
CAA0 issue "letsencrypt.org"300
CAA0 issue "pki.goog; cansignhttpexchanges=yes"300
CAA0 issue "ssl.com"300
CAA0 issuewild ";"300
CAA0 issuewild "comodoca.com"300
CAA0 issuewild "digicert.com; cansignhttpexchanges=yes"300
CAA0 issuewild "letsencrypt.org"300
CAA0 issuewild "pki.goog; cansignhttpexchanges=yes"300
CAA0 issuewild "ssl.com"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 1h, 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: comodoca.com, digicert.com, letsencrypt.org, pki.goog, ssl.com, none (issuance forbidden).