bildungsportal-niedersachsen.de

Checked 21 October 2026, 21:40 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

brian.ns.cloudflare.com, heather.ns.cloudflare.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
brian.ns.cloudflare.com, heather.ns.cloudflare.com
NS in the zone
brian.ns.cloudflare.com, heather.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
brian.ns.cloudflare.com172.64.35.36 108.162.195.36 162.159.44.36 2a06:98c1:50::ac40:2324 2606:4700:58::a29f:2c24 2803:f800:50::6ca2:c324AS13335 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-
heather.ns.cloudflare.com173.245.58.161 108.162.192.161 172.64.32.161 2803:f800:50::6ca2:c0a1 2606:4700:50::adf5:3aa1 2a06:98c1:50::ac40:20a1AS13335 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: brian.ns.cloudflare.com, heather.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
brian.ns.cloudflare.com 172.64.35.36NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
brian.ns.cloudflare.com 108.162.195.36NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
brian.ns.cloudflare.com 162.159.44.36NOERROR, 32 ms, authoritativenoyes / yesrefused2026.10.2
brian.ns.cloudflare.com 2a06:98c1:50::ac40:2324NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
brian.ns.cloudflare.com 2606:4700:58::a29f:2c24NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
brian.ns.cloudflare.com 2803:f800:50::6ca2:c324NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
heather.ns.cloudflare.com 173.245.58.161NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
heather.ns.cloudflare.com 108.162.192.161NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
heather.ns.cloudflare.com 172.64.32.161NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
heather.ns.cloudflare.com 2803:f800:50::6ca2:c0a1NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
heather.ns.cloudflare.com 2606:4700:50::adf5:3aa1NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
heather.ns.cloudflare.com 2a06:98c1:50::ac40:20a1NOERROR, 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: brian.ns.cloudflare.com: "2026.10.2"; heather.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 2416132348 · primary brian.ns.cloudflare.com

Found

Primary (MNAME)
brian.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2416132348
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
brian.ns.cloudflare.com (172.64.35.36)2416132348
brian.ns.cloudflare.com (108.162.195.36)2416132348
brian.ns.cloudflare.com (162.159.44.36)2416132348
brian.ns.cloudflare.com (2a06:98c1:50::ac40:2324)2416132348
brian.ns.cloudflare.com (2606:4700:58::a29f:2c24)2416132348
brian.ns.cloudflare.com (2803:f800:50::6ca2:c324)2416132348
heather.ns.cloudflare.com (173.245.58.161)2416132348
heather.ns.cloudflare.com (108.162.192.161)2416132348
heather.ns.cloudflare.com (172.64.32.161)2416132348
heather.ns.cloudflare.com (2803:f800:50::6ca2:c0a1)2416132348
heather.ns.cloudflare.com (2606:4700:50::adf5:3aa1)2416132348
heather.ns.cloudflare.com (2a06:98c1:50::ac40:20a1)2416132348

Checks

  • ✓ Serial 2416132348 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 brian.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 2416132348 is a Unix timestamp (2046-07-25 11:52 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

12 records at the apex

Found

Read from
172.64.35.36:53
TypeValueTTL
SOAbrian.ns.cloudflare.com. dns.cloudflare.com. 2416132348 10000 2400 604800 18001800
NSbrian.ns.cloudflare.com.86400
NSheather.ns.cloudflare.com.86400
A172.67.171.19300
A104.21.71.171300
AAAA2606:4700:3030::ac43:ab13300
AAAA2606:4700:3032::6815:47ab300
MX10 mail-in1.nibis.de.300
MX10 mail-in2.nibis.de.300
TXT"google-site-verification=RnQzIir71qes2EaW6wb9sb5HQ3XEonhkaB3vveL3pHE"300
TXT"google-site-verification=_X8725-m5UdHwYEaP5prtHbZYbGRCTx1B6P5n92rnjk"300
TXT"v=spf1 redirect=nibis.de"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