cylex.de

Checked 21 October 2026, 22:11 UTC · via 8.8.8.8
!Passed with warnings
20 passed 2 warnings 0 failed 7 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

merlin.ns.cloudflare.com, serena.ns.cloudflare.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
merlin.ns.cloudflare.com, serena.ns.cloudflare.com
NS in the zone
merlin.ns.cloudflare.com, serena.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
merlin.ns.cloudflare.com108.162.193.205 172.64.33.205 173.245.59.205 2a06:98c1:50::ac40:21cd 2803:f800:50::6ca2:c1cd 2606:4700:58::adf5:3bcdAS13335 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-
serena.ns.cloudflare.com172.64.32.220 108.162.192.220 173.245.58.220 2606:4700:50::adf5:3adc 2a06:98c1:50::ac40:20dc 2803:f800:50::6ca2:c0dcAS13335 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: merlin.ns.cloudflare.com, serena.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
merlin.ns.cloudflare.com 108.162.193.205NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
merlin.ns.cloudflare.com 172.64.33.205NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
merlin.ns.cloudflare.com 173.245.59.205NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
merlin.ns.cloudflare.com 2a06:98c1:50::ac40:21cdNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
merlin.ns.cloudflare.com 2803:f800:50::6ca2:c1cdNOERROR, 17 ms, authoritativenoyes / yesrefused2026.10.2
merlin.ns.cloudflare.com 2606:4700:58::adf5:3bcdNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
serena.ns.cloudflare.com 172.64.32.220NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
serena.ns.cloudflare.com 108.162.192.220NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
serena.ns.cloudflare.com 173.245.58.220NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
serena.ns.cloudflare.com 2606:4700:50::adf5:3adcNOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
serena.ns.cloudflare.com 2a06:98c1:50::ac40:20dcNOERROR, 18 ms, authoritativenoyes / yesrefused2026.10.2
serena.ns.cloudflare.com 2803:f800:50::6ca2:c0dcNOERROR, 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: merlin.ns.cloudflare.com: "2026.10.2"; serena.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 2416776765 · primary merlin.ns.cloudflare.com

Found

Primary (MNAME)
merlin.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2416776765
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
merlin.ns.cloudflare.com (108.162.193.205)2416776765
merlin.ns.cloudflare.com (172.64.33.205)2416776765
merlin.ns.cloudflare.com (173.245.59.205)2416776765
merlin.ns.cloudflare.com (2a06:98c1:50::ac40:21cd)2416776765
merlin.ns.cloudflare.com (2803:f800:50::6ca2:c1cd)2416776765
merlin.ns.cloudflare.com (2606:4700:58::adf5:3bcd)2416776765
serena.ns.cloudflare.com (172.64.32.220)2416776765
serena.ns.cloudflare.com (108.162.192.220)2416776765
serena.ns.cloudflare.com (173.245.58.220)2416776765
serena.ns.cloudflare.com (2606:4700:50::adf5:3adc)2416776765
serena.ns.cloudflare.com (2a06:98c1:50::ac40:20dc)2416776765
serena.ns.cloudflare.com (2803:f800:50::6ca2:c0dc)2416776765

Checks

  • ✓ Serial 2416776765 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 merlin.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 2416776765 is a Unix timestamp (2046-08-01 22:52 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

15 records at the apex

Found

Read from
108.162.193.205:53
TypeValueTTL
SOAmerlin.ns.cloudflare.com. dns.cloudflare.com. 2416776765 10000 2400 604800 18001800
NSmerlin.ns.cloudflare.com.86400
NSserena.ns.cloudflare.com.86400
A104.18.17.132300
A104.18.16.132300
AAAA2606:4700::6812:1084300
AAAA2606:4700::6812:1184300
MX10 newsletter.cylex.de.300
MX20 newsletter2.mycylex.de.300
TXT"bm-site-verification=ebbbb3ec61174284e36753f46c66154640069914"300
TXT"google-site-verification=EiBHS2fj5SnEipNAJFA2SJMTQ1efPXT9GZKcaluZW94"300
TXT"google-site-verification=dMcRzxm7xzoQ4w9R0oLP4UCm_cqThz9yKNeItT6jVzQ"300
TXT"kaboozt-publisher-token=ec7bcecf79e2891e32f47f2038ea4e52"300
TXT"lh-verification=a69f3695939a57121884"300
TXT"v=spf1 a ip4:82.207.172.0/24 ip4:82.207.173.0/24 ip4:82.207.174.0/24 ip4:82.207.175.0/24 ip4:94.130.171.12/32 ip4:62.217.61.160/27 ip4:85.17.145.79/32 ip4:213.69.255.221/32 mx include:spf.smtp2go.com include:spf.mandrillapp.com include:sendgrid.net -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.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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