Domain report: octrooicentrum.nl

Registration

info

.nl country-code

Found

TLD: .nl (country-code)
ICANN policies apply: no

Lookup error: https://rdap.sidn.nl/domain/octrooicentrum.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/octrooicentrum.nl returned HTTP 429

#3

Delegation

info

ns1.dictu.nl, ns2.dictu.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns1.dictu.nl, ns2.dictu.nl
NS in the zone: ns1.dictu.nl, ns2.dictu.nl

Nameserver	Addresses	Network (AS)	Glue
ns1.dictu.nl	145.12.216.1 2a04:9a00:1021:201c::1	AS203396 MinEZ-DICTU - Ministerie van Economische Zaken, NL AS203396 MinEZ-DICTU - Ministerie van Economische Zaken, NL	145.12.216.1 2a04:9a00:1021:201c::1
ns2.dictu.nl	145.69.216.1 2a04:9a00:1022:201c::1	AS203396 MinEZ-DICTU - Ministerie van Economische Zaken, NL AS203396 MinEZ-DICTU - Ministerie van Economische Zaken, NL	145.69.216.1 2a04:9a00:1022:201c::1

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.dictu.nl, ns2.dictu.nl.

#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.
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS203396 (MinEZ-DICTU - Ministerie van Economische Zaken, 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 .nl

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

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.dictu.nl 145.12.216.1	NOERROR, 22 ms, authoritative	no	yes / yes	refused	-
ns1.dictu.nl 2a04:9a00:1021:201c::1	NOERROR, 18 ms, authoritative	no	yes / yes	refused	-
ns2.dictu.nl 145.69.216.1	NOERROR, 14 ms, authoritative	no	yes / yes	refused	-
ns2.dictu.nl 2a04:9a00:1022:201c::1	NOERROR, 14 ms, authoritative	no	yes / yes	refused	-

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 2021046941 · primary ns1.dictu.nl

Found

Primary (MNAME): ns1.dictu.nl
Contact (RNAME): datacom.dictu.nl
Serial: 2021046941
Refresh / retry: 43200 s / 3600 s
Expire: 2419200 s
Negative TTL: 900 s

Serial per nameserver

Nameserver	Serial
ns1.dictu.nl (145.12.216.1)	2021046941
ns1.dictu.nl (2a04:9a00:1021:201c::1)	2021046941
ns2.dictu.nl (145.69.216.1)	2021046941
ns2.dictu.nl (2a04:9a00:1022:201c::1)	2021046941

Checks

✓ Serial 2021046941 everywhere #22

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

SOA refresh 12h, retry 1h, expire 28d, negative TTL 15m.
✓ Primary is a public nameserver #24

The primary nameserver ns1.dictu.nl is one of the listed nameservers.
✓ Contact datacom@dictu.nl #25

The SOA RNAME datacom.dictu.nl means datacom@dictu.nl.
✓ Timestamp serial #26

The serial 2021046941 is a Unix timestamp (2034-01-16 17:55 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 14-byte salt
Signatures valid until: 25 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
32741	ECDSAP256SHA256 (13)	SHA256 A87FB36C2341954E…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
12077	ZSK (256)	ECDSAP256SHA256 (13)
37799	ZSK (256)	ECDSAP256SHA256 (13)
32741	KSK (257)	ECDSAP256SHA256 (13)
37684	KSK (257)	RSASHA256 (8)
21139	KSK (257)	RSASHA256 (8)

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 32741 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13), RSASHA256 (8).
✓ Short-lived signatures (online signing) #30

Signatures are valid for 97h0m0s and created on demand; the current one was made at 2026-10-21 19:57 UTC and expires at 2026-10-25 20:56 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations and a 14-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.

#31

Records

info

19 records at the apex

Found

Read from: 145.12.216.1:53

Type	Value	TTL
SOA	ns1.dictu.nl. datacom.dictu.nl. 2021046941 43200 3600 2419200 900	10800
NS	ns1.dictu.nl.	10800
NS	ns2.dictu.nl.	10800
A	46.22.190.36	300
AAAA	2001:4c10:1015:5001::7	300
MX	20 mail03.dictu.nl.	10800
MX	10 mail02.dictu.nl.	10800
MX	20 mail01.dictu.nl.	10800
MX	10 mail04.dictu.nl.	10800
TXT	"v=spf1 include:_spf.dictu.nl include:amazonses.com -all"	10800
TXT	"adobe-idp-site-verification=8c480e344d66062bd5f92406c8024dc21589eeccc25819f88016051266b5b173"	10800
TXT	"miro-verification=9e994fb055bdf079049630ff0947e63f6a68e9d5"	10800
TXT	"_7nrh8jmskqhfy5pxqrmwqno6qlcagcc"	10800
TXT	"_bd1pifvo6nzhas7rytxk4e4aqj8ipfu"	10800
TXT	"_2206nr7uyp54gpu6u1whpu5btx8fvst"	10800
CAA	0 issuewild ";"	10800
CAA	0 issue "www.pkioverheid.nl"	10800
CAA	0 iodef "mailto:dictucertificaatbeheer@dictu.nl"	10800
CAA	0 issue "quovadisglobal.com"	10800

Checks

✓ TTLs within range #32

TTLs: A 5m, AAAA 5m, MX 3h, NS 3h. The NS TTL at the parent is 1h and in the zone 3h; resolvers may use either.
✓ No CNAME at the apex #33

The zone apex has no CNAME record.
i

Wildcard record

A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.

#34
✓ CAA restricts issuance #35

Certificates may be issued by: none (issuance forbidden), www.pkioverheid.nl, quovadisglobal.com.