leibniz-hbi.de

Checked 21 October 2026, 23:11 UTC · via 8.8.8.8
!Passed with warnings
22 passed 3 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

demi.ns.cloudflare.com, norm.ns.cloudflare.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
demi.ns.cloudflare.com, norm.ns.cloudflare.com
NS in the zone
demi.ns.cloudflare.com, norm.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
demi.ns.cloudflare.com108.162.192.95 173.245.58.95 172.64.32.95 2803:f800:50::6ca2:c05f 2606:4700:50::adf5:3a5f 2a06:98c1:50::ac40:205fAS13335 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-
norm.ns.cloudflare.com172.64.33.134 173.245.59.134 108.162.193.134 2606:4700:58::adf5:3b86 2803:f800:50::6ca2:c186 2a06:98c1:50::ac40:2186AS13335 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: demi.ns.cloudflare.com, norm.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
demi.ns.cloudflare.com 108.162.192.95NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
demi.ns.cloudflare.com 173.245.58.95NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
demi.ns.cloudflare.com 172.64.32.95NOERROR, 18 ms, authoritativenoyes / yesrefused2026.10.2
demi.ns.cloudflare.com 2803:f800:50::6ca2:c05fNOERROR, 18 ms, authoritativenoyes / yesrefused2026.10.2
demi.ns.cloudflare.com 2606:4700:50::adf5:3a5fNOERROR, 19 ms, authoritativenoyes / yesrefused2026.10.2
demi.ns.cloudflare.com 2a06:98c1:50::ac40:205fNOERROR, 18 ms, authoritativenoyes / yesrefused2026.10.2
norm.ns.cloudflare.com 172.64.33.134NOERROR, 17 ms, authoritativenoyes / yesrefused2026.10.2
norm.ns.cloudflare.com 173.245.59.134NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
norm.ns.cloudflare.com 108.162.193.134NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
norm.ns.cloudflare.com 2606:4700:58::adf5:3b86NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
norm.ns.cloudflare.com 2803:f800:50::6ca2:c186NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
norm.ns.cloudflare.com 2a06:98c1:50::ac40:2186NOERROR, 16 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: demi.ns.cloudflare.com: "2026.10.2"; norm.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 2417490011 · primary demi.ns.cloudflare.com

Found

Primary (MNAME)
demi.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2417490011
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
demi.ns.cloudflare.com (108.162.192.95)2417490011
demi.ns.cloudflare.com (173.245.58.95)2417490011
demi.ns.cloudflare.com (172.64.32.95)2417490011
demi.ns.cloudflare.com (2803:f800:50::6ca2:c05f)2417490011
demi.ns.cloudflare.com (2606:4700:50::adf5:3a5f)2417490011
demi.ns.cloudflare.com (2a06:98c1:50::ac40:205f)2417490011
norm.ns.cloudflare.com (172.64.33.134)2417490011
norm.ns.cloudflare.com (173.245.59.134)2417490011
norm.ns.cloudflare.com (108.162.193.134)2417490011
norm.ns.cloudflare.com (2606:4700:58::adf5:3b86)2417490011
norm.ns.cloudflare.com (2803:f800:50::6ca2:c186)2417490011
norm.ns.cloudflare.com (2a06:98c1:50::ac40:2186)2417490011

Checks

  • ✓ Serial 2417490011 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 demi.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 2417490011 is a Unix timestamp (2046-08-10 05:00 UTC).

DNSSEC

warn

Signed, but no DS at parent

Found

Validated by resolver
no
Denial of existence
NSEC
Signatures valid until
23 October 2026

DNSKEY in the zone

Key tagRoleAlgorithm
2371KSK (257)ECDSAP256SHA256 (13)
34505ZSK (256)ECDSAP256SHA256 (13)

Checks

  • !
    Signed but not delegated securely
    The zone is signed but the parent has no DS record, so the signatures are not used. Publish the DS record at your registrar.
    #27
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Short-lived signatures (online signing) #30
    Signatures are valid for 50h0m0s and created on demand; the current one was made at 2026-10-20 22:11 UTC and expires at 2026-10-23 00:11 UTC.
  • i
    NSEC
    The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.
    #31

Records

warn

12 records at the apex

Found

Read from
108.162.192.95:53
TypeValueTTL
SOAdemi.ns.cloudflare.com. dns.cloudflare.com. 2417490011 10000 2400 604800 18001800
NSdemi.ns.cloudflare.com.86400
NSnorm.ns.cloudflare.com.86400
A23.88.60.19060
MX0 leibnizhbi-de01i.mail.protection.outlook.com.300
TXT"MS=MS"300
TXT"ZOOM_verify_urxeIpp"300
TXT"atlassian-domain-verification=FmrjoKzk5b7g/VGitcmw7oBtK96JUXHhbZlynrmWT1e1ZmSwBNcbPc7KFH5hyr8Y"300
TXT"atlassian-sending-domain-verification=167711f7-d60d-406b-90a5-3e8e5dc704de"300
TXT"canva-site-verification=keI81iOlzA1ywpDIixKT3A"300
TXT"google-site-verification=B4NZe2T5CXOyKKRzGIaRTC6Ol8C3HJeFPpYZ-M8_E9Y"300
TXT"v=spf1 include:spf.mailjet.com mx a:ox.leibniz-hbi.de a:hbiteam.de ip4:195.37.138.181 ip4:193.174.240.41 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 (1m). 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