cz.nl

Checked 21 October 2026, 21:00 UTC · via 8.8.8.8
iAll checks passed
27 passed 0 warnings 0 failed 8 info

Registration

info

.nl country-code · KPN B.V.

Found

TLD
.nl (country-code)
ICANN policies apply
no
Registrar
KPN B.V.
Registered
17 October 1997
Last changed
1 June 2026
Status
active
Registry nameservers
ns1.kpn.net, ns11.kpn.net
RDAP server
https://rdap.sidn.nl/

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
    Expiry date not published
    The registry does not publish the expiry date in RDAP. Check it with your registrar.
    #3
  • i
    No transfer lock
    The domain has no transfer lock (status: active). A registrar lock protects against unauthorized transfers.
    #4
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns1.kpn.net, ns11.kpn.net

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
ns1.kpn.net, ns11.kpn.net
NS in the zone
ns1.kpn.net, ns11.kpn.net
NameserverAddressesNetwork (AS)Glue
ns1.kpn.net194.151.228.10 2a02:a47f:ac:1::153AS1136 KPN - KPN B.V., NL AS1136 KPN - KPN B.V., NL-
ns11.kpn.net213.75.63.33 2a02:a47f:ac:1::1153AS1136 KPN - KPN B.V., NL AS1136 KPN - KPN B.V., NL-

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.kpn.net, ns11.kpn.net.
    #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.
  • i
    One address family in one network
    all IPv6 addresses are in 2a02:a47f:ac::/48, while the other address family is spread over several networks.
    #10
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS1136 (KPN - KPN B.V., NL): 4 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 .net
    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

pass

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.kpn.net 194.151.228.10NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns1.kpn.net 2a02:a47f:ac:1::153NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns11.kpn.net 213.75.63.33NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns11.kpn.net 2a02:a47f:ac:1::1153NOERROR, 10 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 4 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.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ 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 2026102108 · primary ns1.kpn.net

Found

Primary (MNAME)
ns1.kpn.net
Contact (RNAME)
zonemaster.kpn.com
Serial
2026102108
Refresh / retry
14400 s / 7200 s
Expire
2419200 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns1.kpn.net (194.151.228.10)2026102108
ns1.kpn.net (2a02:a47f:ac:1::153)2026102108
ns11.kpn.net (213.75.63.33)2026102108
ns11.kpn.net (2a02:a47f:ac:1::1153)2026102108

Checks

  • ✓ Serial 2026102108 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 2h, expire 28d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.kpn.net is one of the listed nameservers.
  • ✓ Contact zonemaster@kpn.com #25
    The SOA RNAME zonemaster.kpn.com means zonemaster@kpn.com.
  • ✓ Date-based serial #26
    The serial 2026102108 follows the YYYYMMDDnn convention (2026-10-21).

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
0 iterations, 0-byte salt
Signatures valid until
29 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
34240ECDSAP256SHA256 (13)SHA256 B8EE88079F3D4BC3…yes

DNSKEY in the zone

Key tagRoleAlgorithm
48176ZSK (256)ECDSAP256SHA256 (13)
34240KSK (257)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 34240 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-10-29 #30
    The earliest DNSKEY/SOA signature expires at 2026-10-29 00:00 UTC.
  • ✓ NSEC3 as recommended #31
    The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

info

16 records at the apex

Found

Read from
194.151.228.10:53
TypeValueTTL
SOAns1.kpn.net. zonemaster.kpn.com. 2026102108 14400 7200 2419200 36003600
NSns1.kpn.net.3600
NSns11.kpn.net.3600
A20.238.207.25300
MX0 cz-nl.mail.protection.outlook.com.3600
TXT"docker-verification=7201f5bb-566f-40f8-a50b-c02ffe0861af"3600
TXT"google-site-verification=YUdmjgfssUgsndz5C5uD1pcNys-u6iMjGQPpXocbf-Q"3600
TXT"aUGz888DmRR+mJPrFczsewk+zdBBRwkfx9hgGvgtKCYZt251CZDqPActSbFgxqs0ynT12iQSJ/gtiLr67Bluvw=="3600
TXT"dQG+mMguJuGe08C+M61vuJ38/K5TpFE7NPuKSWSYq1eo6FVP+XPGm7TLw/eRBI0gJMGdDKQGwzgaO7etTTCV0A=="3600
TXT"password-site-verification=JXZHOA524NEV5JQWXAARCHV66E"3600
TXT"3ptnbhgcl7km7tp634r46rnvptc496fh"3600
TXT"Dynatrace-site-verification=66f6f0c3-c1a3-495f-820b-46b4bc39200e__sqf0l9t8hki4rdlll4uvsk4if5"3600
TXT"r2th1g9cj341909vcd1p683f9pk1pzjf"3600
TXT"1password-site-verification=JXZHOA524NEV5JQWXAARCHV66E"3600
TXT"v=spf1 ip4:194.88.231.19 ip4:194.151.60.49 ip4:194.151.60.48 include:spf.protection.outlook.com -all"3600
TXT"fbb1091dd25a8a4c008fd6f802c8ae3c1a29384ca7d49c6dd472ed6c3eb4859e"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 1h, NS 1h.
  • ✓ 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