doctolib.de

Checked 21 October 2026, 22:14 UTC · via 8.8.8.8
!Passed with warnings
24 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

bob.ns.cloudflare.com, naomi.ns.cloudflare.com

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
bob.ns.cloudflare.com, naomi.ns.cloudflare.com
NS in the zone
bob.ns.cloudflare.com, naomi.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
bob.ns.cloudflare.com172.64.33.104 108.162.193.104 173.245.59.104 2803:f800:50::6ca2:c168 2606:4700:58::adf5:3b68 2a06:98c1:50::ac40:2168AS13335 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-
naomi.ns.cloudflare.com108.162.192.208 173.245.58.208 172.64.32.208 2803:f800:50::6ca2:c0d0 2606:4700:50::adf5:3ad0 2a06:98c1:50::ac40:20d0AS13335 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: bob.ns.cloudflare.com, naomi.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
bob.ns.cloudflare.com 172.64.33.104NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
bob.ns.cloudflare.com 108.162.193.104NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
bob.ns.cloudflare.com 173.245.59.104NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
bob.ns.cloudflare.com 2803:f800:50::6ca2:c168NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
bob.ns.cloudflare.com 2606:4700:58::adf5:3b68NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
bob.ns.cloudflare.com 2a06:98c1:50::ac40:2168NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
naomi.ns.cloudflare.com 108.162.192.208NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
naomi.ns.cloudflare.com 173.245.58.208NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
naomi.ns.cloudflare.com 172.64.32.208NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
naomi.ns.cloudflare.com 2803:f800:50::6ca2:c0d0NOERROR, 14 ms, authoritativenoyes / yesrefused2026.10.2
naomi.ns.cloudflare.com 2606:4700:50::adf5:3ad0NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
naomi.ns.cloudflare.com 2a06:98c1:50::ac40:20d0NOERROR, 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: bob.ns.cloudflare.com: "2026.10.2"; naomi.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 2418003773 · primary bob.ns.cloudflare.com

Found

Primary (MNAME)
bob.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2418003773
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
bob.ns.cloudflare.com (172.64.33.104)2418003773
bob.ns.cloudflare.com (108.162.193.104)2418003773
bob.ns.cloudflare.com (173.245.59.104)2418003773
bob.ns.cloudflare.com (2803:f800:50::6ca2:c168)2418003773
bob.ns.cloudflare.com (2606:4700:58::adf5:3b68)2418003773
bob.ns.cloudflare.com (2a06:98c1:50::ac40:2168)2418003773
naomi.ns.cloudflare.com (108.162.192.208)2418003773
naomi.ns.cloudflare.com (173.245.58.208)2418003773
naomi.ns.cloudflare.com (172.64.32.208)2418003773
naomi.ns.cloudflare.com (2803:f800:50::6ca2:c0d0)2418003773
naomi.ns.cloudflare.com (2606:4700:50::adf5:3ad0)2418003773
naomi.ns.cloudflare.com (2a06:98c1:50::ac40:20d0)2418003773

Checks

  • ✓ Serial 2418003773 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 bob.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 2418003773 is a Unix timestamp (2046-08-16 03:42 UTC).

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC
Signatures valid until
22 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
2371ECDSAP256SHA256 (13)SHA256 BB191061C3C5213D…yes

DNSKEY in the zone

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

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • ✓ DS matches a key #28
    The DS record at the parent matches a key in the zone: key tag 2371 (SHA256).
  • ✓ 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 21:14 UTC and expires at 2026-10-22 23:14 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

26 records at the apex

Found

Read from
172.64.33.104:53
TypeValueTTL
SOAbob.ns.cloudflare.com. dns.cloudflare.com. 2418003773 10000 2400 604800 18001800
NSbob.ns.cloudflare.com.86400
NSnaomi.ns.cloudflare.com.86400
A93.115.102.100300
AAAA2a14:7ac0::70300
MX1 aspmx.l.google.com.120
MX10 alt3.aspmx.l.google.com.120
MX10 alt4.aspmx.l.google.com.120
MX5 alt1.aspmx.l.google.com.120
MX5 alt2.aspmx.l.google.com.120
TXT"00D1i000000981I=1TBTn00000000bC"120
TXT"00DG5000009mApV=1TBG50000000ExR"120
TXT"46x082p0fh0mkvqkzmwpvwwj0s49mbg1"120
TXT"MS=ms75147005"120
TXT"Sendinblue-code:765d1b570edeb414a44195eced1dbafe"120
TXT"_4lzlcuu9m5et0nnx4qsyjaq9a6cy9xu"120
TXT"brevo-code:96925617caa5da0d69f134979d0560a0"120
TXT"dtm-domain-verification=5AA84FhHz9mmI2cAb0l31tSwCecktcpWCy1k9X0fa3o"120
TXT"facebook-domain-verification=n7hg66k8w9p8hmjkzyt8nk0jhl6kyf"120
TXT"google-site-verification=DKw-5p4lpHzFVAwXOBeXAFw4vaeEVWuqx_5EfiqTVsQ"120
TXT"google-site-verification=S8UeJ8yjczqn8IvoHNozMmPXqeOsGoZq3GXYaS6qNek"120
TXT"google-site-verification=Z3eyzshIw6jfRkVIHWJJT0w3exh6uVTfZN_t6eTRqLQ"120
TXT"google-site-verification=s6rj2VXrW6hbshhZBYXTI9nu_uU8U8uBkO22GbGmFFg"120
TXT"google-site-verification=wqXAt554YaP0ezrKfHjxhpUBIPtARYemvMMI2JDq1_4"120
TXT"pxky43d16308c1vp7xxp6w0py2gy92j0"120
TXT"v=spf1 include:_spf.google.com include:_spf.salesforce.com include:spf.sendinblue.com include:spf.flowmailer.net a:zgateway.zuora.com -all"120

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: MX (2m). 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