bildungsurlaub.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

cheryl.ns.cloudflare.com, isaac.ns.cloudflare.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
cheryl.ns.cloudflare.com, isaac.ns.cloudflare.com
NS in the zone
cheryl.ns.cloudflare.com, isaac.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
cheryl.ns.cloudflare.com173.245.58.83 108.162.192.83 172.64.32.83 2803:f800:50::6ca2:c053 2606:4700:50::adf5:3a53 2a06:98c1:50::ac40:2053AS13335 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-
isaac.ns.cloudflare.com108.162.193.177 172.64.33.177 173.245.59.177 2a06:98c1:50::ac40:21b1 2803:f800:50::6ca2:c1b1 2606:4700:58::adf5:3bb1AS13335 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: cheryl.ns.cloudflare.com, isaac.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
cheryl.ns.cloudflare.com 173.245.58.83NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
cheryl.ns.cloudflare.com 108.162.192.83NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
cheryl.ns.cloudflare.com 172.64.32.83NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
cheryl.ns.cloudflare.com 2803:f800:50::6ca2:c053NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
cheryl.ns.cloudflare.com 2606:4700:50::adf5:3a53NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
cheryl.ns.cloudflare.com 2a06:98c1:50::ac40:2053NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
isaac.ns.cloudflare.com 108.162.193.177NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
isaac.ns.cloudflare.com 172.64.33.177NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
isaac.ns.cloudflare.com 173.245.59.177NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
isaac.ns.cloudflare.com 2a06:98c1:50::ac40:21b1NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
isaac.ns.cloudflare.com 2803:f800:50::6ca2:c1b1NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
isaac.ns.cloudflare.com 2606:4700:58::adf5:3bb1NOERROR, 18 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: cheryl.ns.cloudflare.com: "2026.10.2"; isaac.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 2417439509 · primary cheryl.ns.cloudflare.com

Found

Primary (MNAME)
cheryl.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2417439509
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
cheryl.ns.cloudflare.com (173.245.58.83)2417439509
cheryl.ns.cloudflare.com (108.162.192.83)2417439509
cheryl.ns.cloudflare.com (172.64.32.83)2417439509
cheryl.ns.cloudflare.com (2803:f800:50::6ca2:c053)2417439509
cheryl.ns.cloudflare.com (2606:4700:50::adf5:3a53)2417439509
cheryl.ns.cloudflare.com (2a06:98c1:50::ac40:2053)2417439509
isaac.ns.cloudflare.com (108.162.193.177)2417439509
isaac.ns.cloudflare.com (172.64.33.177)2417439509
isaac.ns.cloudflare.com (173.245.59.177)2417439509
isaac.ns.cloudflare.com (2a06:98c1:50::ac40:21b1)2417439509
isaac.ns.cloudflare.com (2803:f800:50::6ca2:c1b1)2417439509
isaac.ns.cloudflare.com (2606:4700:58::adf5:3bb1)2417439509

Checks

  • ✓ Serial 2417439509 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 cheryl.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 2417439509 is a Unix timestamp (2046-08-09 14:58 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
173.245.58.83:53
TypeValueTTL
SOAcheryl.ns.cloudflare.com. dns.cloudflare.com. 2417439509 10000 2400 604800 18001800
NScheryl.ns.cloudflare.com.86400
NSisaac.ns.cloudflare.com.86400
A172.67.146.98300
A104.21.47.94300
AAAA2606:4700:3030::6815:2f5e300
AAAA2606:4700:3034::ac43:9262300
MX1 aspmx.l.google.com.3600
MX10 alt3.aspmx.l.google.com.3600
MX10 alt4.aspmx.l.google.com.3600
MX5 alt1.aspmx.l.google.com.3600
MX5 alt2.aspmx.l.google.com.3600
TXT"brevo-code:603a927ae30803f67e0790764609c9bc"300
TXT"google-site-verification=Tb8fLq9AN9lrPlxAXEHaaYYxQ5RvfE5oxQJA-mJ8aP4"300
TXT"google-site-verification=YRjSEI-oVs0KCpri8UG4KP6X56wfASEQ7Wet3F8MH4g"300
TXT"google-site-verification=i8cz_cXnlKxMUmPUgBpWeObzIp19HLDiuxduekqWaqc"300
TXT"google-site-verification=v6RxtycJCMd57yJUcHfl-rrSQcYCGJokkqkOdjBaOYI"300
TXT"google-site-verification=zskPzyBMgXu7aems4AZwd9wdvoYquz7SHuGTVOpZ6iM"300
TXT"v=spf1 include:spf.mailjet.com a mx include:_spf.google.com ~all"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.
  • 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