maartenskliniek.nl

Checked 22 October 2026, 14:21 UTC · via 8.8.8.8
!Passed with warnings
25 passed 1 warning 0 failed 7 info

Registration

info

.nl country-code

Found

TLD
.nl (country-code)
ICANN policies apply
no
Lookup error: https://rdap.sidn.nl/domain/maartenskliniek.nl returned HTTP 429

Checks

  • i
    .nl 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
    .nl is delegated in the root zone and DNSSEC-signed.
  • i
    Could not be checked
    The RDAP lookup failed, so this could not be checked: https://rdap.sidn.nl/domain/maartenskliniek.nl returned HTTP 429
    #3

Delegation

info

chelsea.ns.cloudflare.com, miguel.ns.cloudflare.com

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
chelsea.ns.cloudflare.com, miguel.ns.cloudflare.com
NS in the zone
chelsea.ns.cloudflare.com, miguel.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
chelsea.ns.cloudflare.com108.162.194.177 172.64.34.177 162.159.38.177 2a06:98c1:50::ac40:22b1 2606:4700:50::a29f:26b1 2803:f800:50::6ca2:c2b1AS13335 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-
miguel.ns.cloudflare.com108.162.195.95 162.159.44.95 172.64.35.95 2803:f800:50::6ca2:c35f 2a06:98c1:50::ac40:235f 2606:4700:58::a29f:2c5fAS13335 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: chelsea.ns.cloudflare.com, miguel.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
chelsea.ns.cloudflare.com 108.162.194.177NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
chelsea.ns.cloudflare.com 172.64.34.177NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
chelsea.ns.cloudflare.com 162.159.38.177NOERROR, 32 ms, authoritativenoyes / yesrefused2026.10.2
chelsea.ns.cloudflare.com 2a06:98c1:50::ac40:22b1NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
chelsea.ns.cloudflare.com 2606:4700:50::a29f:26b1NOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
chelsea.ns.cloudflare.com 2803:f800:50::6ca2:c2b1NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
miguel.ns.cloudflare.com 108.162.195.95NOERROR, 17 ms, authoritativenoyes / yesrefused2026.10.2
miguel.ns.cloudflare.com 162.159.44.95NOERROR, 33 ms, authoritativenoyes / yesrefused2026.10.2
miguel.ns.cloudflare.com 172.64.35.95NOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
miguel.ns.cloudflare.com 2803:f800:50::6ca2:c35fNOERROR, 15 ms, authoritativenoyes / yesrefused2026.10.2
miguel.ns.cloudflare.com 2a06:98c1:50::ac40:235fNOERROR, 16 ms, authoritativenoyes / yesrefused2026.10.2
miguel.ns.cloudflare.com 2606:4700:58::a29f:2c5fNOERROR, 17 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: chelsea.ns.cloudflare.com: "2026.10.2"; miguel.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 2417467061 · primary chelsea.ns.cloudflare.com

Found

Primary (MNAME)
chelsea.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2417467061
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
chelsea.ns.cloudflare.com (108.162.194.177)2417467061
chelsea.ns.cloudflare.com (172.64.34.177)2417467061
chelsea.ns.cloudflare.com (162.159.38.177)2417467061
chelsea.ns.cloudflare.com (2a06:98c1:50::ac40:22b1)2417467061
chelsea.ns.cloudflare.com (2606:4700:50::a29f:26b1)2417467061
chelsea.ns.cloudflare.com (2803:f800:50::6ca2:c2b1)2417467061
miguel.ns.cloudflare.com (108.162.195.95)2417467061
miguel.ns.cloudflare.com (162.159.44.95)2417467061
miguel.ns.cloudflare.com (172.64.35.95)2417467061
miguel.ns.cloudflare.com (2803:f800:50::6ca2:c35f)2417467061
miguel.ns.cloudflare.com (2a06:98c1:50::ac40:235f)2417467061
miguel.ns.cloudflare.com (2606:4700:58::a29f:2c5f)2417467061

Checks

  • ✓ Serial 2417467061 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 chelsea.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 2417467061 is a Unix timestamp (2046-08-09 22:37 UTC).

DNSSEC

info

Signed, DS published at parent

Found

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

DS at the parent

Key tagAlgorithmDigestMatches a key
2371ECDSAP256SHA256 (13)SHA256 CBAAE72BB4B312F1…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 2026-10-21 13:21 UTC and expires at 2026-10-23 15:21 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

info

19 records at the apex

Found

Read from
108.162.194.177:53
TypeValueTTL
SOAchelsea.ns.cloudflare.com. dns.cloudflare.com. 2417467061 10000 2400 604800 18001800
NSchelsea.ns.cloudflare.com.86400
NSmiguel.ns.cloudflare.com.86400
A104.20.19.97300
A172.66.167.112300
AAAA2606:4700:10::ac42:a770300
AAAA2606:4700:10::6814:1361300
MX10 maartenskliniek-nl.mail.protection.outlook.com.300
TXT"00D1t000000GWjj=1TBQw00000000Mb"300
TXT"MQ8kCnCeewj64mI0bCu7SbffElXrU1eM2XYGkbC97gQ="300
TXT"MS=ms78852753"300
TXT"apple-domain-verification=SMUbj1zBgS7lWsLL"300
TXT"cisco-ci-domain-verification=46eb58f3ae2c4a6a5aede93c7e437a18bbbb9fbec579ba0745852245afad51ff"300
TXT"google-site-verification=ZWS6hDa9niIrXv8Ek0XBTwyjl20tz1DR60ifbnciMCg"300
TXT"google-site-verification=bLoQoU3_SzJY6PHSGir_Yuh8mq_XgTbs7CNBCRT_gHo"300
TXT"google-site-verification=pDqepnYgb0mIiZOLpSgvmFt9QnBtXQK350mz3_vor7U"300
TXT"gtZDLitkzqjx+LtVV9mVO2REvffrjrB2sWom7O0eyxlrNN3nwY/dhJSfFO9PFjmKEerkE54j+Afq/PUy+Lea7w=="300
TXT"v=spf1 ip4:199.255.192.0/22 ip4:199.127.232.0/22 ip4:54.240.0.0/18 ip4:69.169.224.0/20 ip4:23.249.208.0/20 ip4:23.251.224.0/19 ip4:76.223.176.0/20 ip4:54.240.64.0/19 ip4:54.240.96.0/19 ip4:52.82.172.0/22 ip4:194.88.231.0/23 ip4:81.173.55.40 ip4:5.22.250.1" "33 ip4:40.67.222.172 ip4:52.174.248.151 ip4:83.149.98.65 include:fdspfeuc.freshemail.io include:spf.protection.outlook.com include:_spf.zivver.com include:_spf.salesforce.com include:_spf.zorgmail.nl include:_spf.ezorg.nl ip4:198.2.128.0/24 ip4:198.2.132." "0/22 ip4:198.2.136.0/23 ip4:198.2.145.0/24 ip4:198.2.186.0/23 ip4:205.201.131.128/25 ip4:205.201.134.128/25 ip4:205.201.136.0/23 ip4:205.201.139.0/24 ip4:198.2.177.0/24 ip4:198.2.178.0/23 ip4:198.2.180.0/24 ip4:5.39.169.42 ip4:205.201.128.0/20 ip4:148.105" ".8.0/21 ip4:80.246.195.160/28 ip4:157.97.213.30 ip4:62.204.93.131 ip4:207.244.98.227 ip4:83.149.98.72 ip4:81.17.56.1 ip4:83.149.98.73 ip4:13.88.226.191 ip4:40.115.66.46 ip4:13.94.232.90 ip4:191.238.213.99 ip4:51.13.102.144 ip4:178.162.177.161 ip4:3.74.56." "125 ip4:4.185.96.20 ip4:20.162.206.62 ip4:172.172.139.18 ip4:4.223.229.111 ip4:94.124.94.113 ip4:89.200.203.150 ip4:185.103.19.215 ip6:2001:4cb8:638:ffff::fefc ip6:2001:4cb8:638:8::/64 include:i.%{ir}._d.mailserver.xpressionmanager.nl.my.spf.guru -all"300
TXT"zoho-verification=zb26249440.zmverify.zoho.eu"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 5m, NS 1d. The NS TTL at the parent is 1h and in the zone 1d; resolvers may use either.
  • ✓ 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