schuelerhilfe.de

Checked 22 October 2026, 00:02 UTC · via 8.8.8.8
!Passed with warnings
24 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

chloe.ns.cloudflare.com, marek.ns.cloudflare.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
chloe.ns.cloudflare.com, marek.ns.cloudflare.com
NS in the zone
chloe.ns.cloudflare.com, marek.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
chloe.ns.cloudflare.com172.64.32.85 108.162.192.85 173.245.58.85 2803:f800:50::6ca2:c055 2606:4700:50::adf5:3a55 2a06:98c1:50::ac40:2055AS13335 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-
marek.ns.cloudflare.com108.162.193.202 172.64.33.202 173.245.59.202 2606:4700:58::adf5:3bca 2803:f800:50::6ca2:c1ca 2a06:98c1:50::ac40:21caAS13335 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: chloe.ns.cloudflare.com, marek.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
chloe.ns.cloudflare.com 172.64.32.85NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
chloe.ns.cloudflare.com 108.162.192.85NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
chloe.ns.cloudflare.com 173.245.58.85NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
chloe.ns.cloudflare.com 2803:f800:50::6ca2:c055NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
chloe.ns.cloudflare.com 2606:4700:50::adf5:3a55NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
chloe.ns.cloudflare.com 2a06:98c1:50::ac40:2055NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
marek.ns.cloudflare.com 108.162.193.202NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
marek.ns.cloudflare.com 172.64.33.202NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
marek.ns.cloudflare.com 173.245.59.202NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
marek.ns.cloudflare.com 2606:4700:58::adf5:3bcaNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
marek.ns.cloudflare.com 2803:f800:50::6ca2:c1caNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
marek.ns.cloudflare.com 2a06:98c1:50::ac40:21caNOERROR, 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: chloe.ns.cloudflare.com: "2026.10.2"; marek.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 2417971989 · primary chloe.ns.cloudflare.com

Found

Primary (MNAME)
chloe.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2417971989
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
chloe.ns.cloudflare.com (172.64.32.85)2417971989
chloe.ns.cloudflare.com (108.162.192.85)2417971989
chloe.ns.cloudflare.com (173.245.58.85)2417971989
chloe.ns.cloudflare.com (2803:f800:50::6ca2:c055)2417971989
chloe.ns.cloudflare.com (2606:4700:50::adf5:3a55)2417971989
chloe.ns.cloudflare.com (2a06:98c1:50::ac40:2055)2417971989
marek.ns.cloudflare.com (108.162.193.202)2417971989
marek.ns.cloudflare.com (172.64.33.202)2417971989
marek.ns.cloudflare.com (173.245.59.202)2417971989
marek.ns.cloudflare.com (2606:4700:58::adf5:3bca)2417971989
marek.ns.cloudflare.com (2803:f800:50::6ca2:c1ca)2417971989
marek.ns.cloudflare.com (2a06:98c1:50::ac40:21ca)2417971989

Checks

  • ✓ Serial 2417971989 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 chloe.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 2417971989 is a Unix timestamp (2046-08-15 18:53 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 23:02 UTC and expires at 2026-10-23 01:02 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

pass

44 records at the apex

Found

Read from
172.64.32.85:53
TypeValueTTL
SOAchloe.ns.cloudflare.com. dns.cloudflare.com. 2417971989 10000 2400 604800 18001800
NSchloe.ns.cloudflare.com.86400
NSmarek.ns.cloudflare.com.86400
A141.101.90.97300
A141.101.90.96300
A141.101.90.98300
A141.101.90.99300
AAAA2a06:98c1:3200::90:0300
AAAA2a06:98c1:3200::90:1300
AAAA2a06:98c1:3200::90:3300
AAAA2a06:98c1:3200::90:2300
MX0 mail.schuelerhilfe.de.3600
TXT"7184ced80b6d49d68a8d03fb8c027448"300
TXT"MS=ms35888891"300
TXT"Trustpilot-Verification-kqvVskCm6JQ9Vg1qAmahpBSJ5tvZORbriFyVIk4E"300
TXT"apple-domain-verification=fjJINS8VAk9mNtbnHZ0sAuonSgal4_NQADNPnbcZIlY"300
TXT"brevo-code:8a90218d48ebf57a1160a83758094eec"300
TXT"detectify-verification=54ffea45f9f70b40b312578b417ad93e"300
TXT"facebook-domain-verification=nwyz1eovx73mb5rpw9qd6sxw1ytuu9"300
TXT"google-site-verification=E13Glh6-AjJhb-vI3q7NtR_MiXqABjkGx5O4rhsLeH8"300
TXT"google-site-verification=OAbhr21v0Ro-Z9D-N0R4GjWdhL0gZ3gBkdXixXYGhgE"300
TXT"hibp-verify=dweb_apgs2kuvdcg5m7hg1br1gwup"300
TXT"sophos-domain-verification=ebe6c126a4935cb401c374f37a7652d58316f3a56ea618b766b9c235bf8075a1"300
TXT"v=spf1 include:spf.schuelerhilfe.de include:mail.zendesk.com include:spf.protection.outlook.com include:spf.brevo.com -all"300
CAA0 issue "amazon.com"300
CAA0 issue "amazonaws.com"300
CAA0 issue "amazontrust.com"300
CAA0 issue "awstrust.com"300
CAA0 issue "certum.pl"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 "amazon.com"300
CAA0 issuewild "amazonaws.com"300
CAA0 issuewild "amazontrust.com"300
CAA0 issuewild "awstrust.com"300
CAA0 issuewild "certum.pl"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: amazon.com, amazonaws.com, amazontrust.com, awstrust.com, certum.pl, comodoca.com, digicert.com, letsencrypt.org, pki.goog, ssl.com.