kb.nl

.nl country-code · SURF B.V.

Found

TLD

.nl (country-code)

ICANN policies apply

no

Registrar

SURF B.V.

Registered

13 June 1997

Last changed

31 August 2026

Status

active

Registry nameservers

ns1.surfnet.nl, ns1.zurich.surf.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.

ns1.surfnet.nl, ns1.zurich.surf.net

Found

Parent zone

nl

Delegation from

ns1.dns.nl (194.0.28.53)

NS at the parent

ns1.surfnet.nl, ns1.zurich.surf.net

NS in the zone

ns1.surfnet.nl, ns1.zurich.surf.net

Checks

• i

  2 nameservers

  Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.surfnet.nl, ns1.zurich.surf.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.
• ✓ Nameservers in different networks #10

  The nameservers are spread over 2 IPv4 /24s and 2 IPv6 /48s.
• ✓ 2 autonomous systems #11

  The nameservers are spread over: AS1103 (SURFNET-NL - SURF B.V., NL): 2 addresses; AS559 (Switch - SWITCH, CH): 2 addresses.
• ✓ Nameserver names under 2 TLDs #12

  Nameserver names use the TLDs .net, .nl.
• ✓ All reachable over IPv6 #13

  Every nameserver has an IPv6 address.

4 of 4 addresses answer authoritatively

Found

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.
• i

  Identifying string disclosed

  These nameservers answer version queries with a string that is not a version number: ns1.surfnet.nl: "This is a SURFnet nameserver - dns-beheer@surfnet.nl"; ns1.zurich.surf.net: "This is a SURFnet nameserver - dns-beheer@surf.nl".

  #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.

serial 2015351906 · primary ns1-konbib.kb.nl

Found

Primary (MNAME)

ns1-konbib.kb.nl

Contact (RNAME)

postmaster.kb.nl

Serial

2015351906

Refresh / retry

10800 s / 1080 s

Expire

2419200 s

Negative TTL

900 s

Serial per nameserver

Checks

• ✓ Serial 2015351906 everywhere #22

  All nameservers serve the same version of the zone.
• ✓ Timers within recommendations #23

  SOA refresh 3h, retry 18m, expire 28d, negative TTL 15m.
• i

  Hidden master (not resolvable)

  The primary nameserver ns1-konbib.kb.nl is not listed as a nameserver and does not resolve publicly: a hidden master, or a placeholder name. Some tools (e.g. dynamic updates) use MNAME to find the primary.

  #24
• ✓ Contact postmaster@kb.nl #25

  The SOA RNAME postmaster.kb.nl means postmaster@kb.nl.
• ✓ Timestamp serial #26

  The serial 2015351906 is a Unix timestamp (2033-11-11 19:58 UTC).

Signed, DS published at parent

Found

Validated by resolver

yes

Denial of existence

NSEC

Signatures valid until

25 October 2026

DS at the parent

DNSKEY in the zone

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 13417 (SHA256).
• ✓ Modern algorithms #29

  Key algorithms: ECDSAP256SHA256 (13).
• ✓ Short-lived signatures (online signing) #30

  Signatures are valid for 96h0m0s and created on demand; the current one was made at 2026-10-21 10:59 UTC and expires at 2026-10-25 11:07 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