Domain report: uitzinnig.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

warn

ns25.csv-networks.nl, ns26.csv-networks.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns25.csv-networks.nl, ns26.csv-networks.nl
NS in the zone: ns25.csv-networks.nl, ns26.csv-networks.nl

Nameserver	Addresses	Network (AS)	Glue
ns25.csv-networks.nl	185.33.117.67 2a00:cc20:1:43a2::3	AS20495 WEDARE - We Dare B.V., NL AS20495 WEDARE - We Dare B.V., NL	-
ns26.csv-networks.nl	185.33.117.68 2a00:cc20:1:43a2::4	AS20495 WEDARE - We Dare B.V., NL AS20495 WEDARE - We Dare B.V., NL	-

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns25.csv-networks.nl, ns26.csv-networks.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 one network

all IPv4 addresses are in 185.33.117.0/24; all IPv6 addresses are in 2a00:cc20:1::/48. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).

#10
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS20495 (WEDARE - We Dare 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
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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

warn

4 of 4 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns25.csv-networks.nl 185.33.117.67	NOERROR, 11 ms, authoritative	no	yes / yes	refused	9.11.36-RedHat-9.11.36-16.el8_10.14
ns25.csv-networks.nl 2a00:cc20:1:43a2::3	NOERROR, 11 ms, authoritative	no	yes / yes	refused	9.11.36-RedHat-9.11.36-16.el8_10.14
ns26.csv-networks.nl 185.33.117.68	NOERROR, 9 ms, authoritative	no	yes / yes	refused	9.11.36-RedHat-9.11.36-16.el8_10.14
ns26.csv-networks.nl 2a00:cc20:1:43a2::4	NOERROR, 10 ms, authoritative	no	yes / yes	refused	9.11.36-RedHat-9.11.36-16.el8_10.14

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.
!

Software version disclosed

These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns25.csv-networks.nl: "9.11.36-RedHat-9.11.36-16.el8_10.14"; ns26.csv-networks.nl: "9.11.36-RedHat-9.11.36-16.el8_10.14". 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

warn

serial 2026100101 · primary ns25.csv-networks.nl

Found

Primary (MNAME): ns25.csv-networks.nl
Contact (RNAME): root.uitzinnig.nl
Serial: 2026100101
Refresh / retry: 3600 s / 3600 s
Expire: 1209600 s
Negative TTL: 1800 s

Serial per nameserver

Nameserver	Serial
ns25.csv-networks.nl (185.33.117.67)	2026100101
ns25.csv-networks.nl (2a00:cc20:1:43a2::3)	2026100101
ns26.csv-networks.nl (185.33.117.68)	2026100101
ns26.csv-networks.nl (2a00:cc20:1:43a2::4)	2026100101

Checks

✓ Serial 2026100101 everywhere #22

All nameservers serve the same version of the zone.
!

Unusual SOA timers

retry 1h should be shorter than refresh 1h. Current values: refresh 1h, retry 1h, expire 14d, negative TTL 30m.

#23
✓ Primary is a public nameserver #24

The primary nameserver ns25.csv-networks.nl is one of the listed nameservers.
✓ Contact root@uitzinnig.nl #25

The SOA RNAME root.uitzinnig.nl means root@uitzinnig.nl.
✓ Date-based serial #26

The serial 2026100101 follows the YYYYMMDDnn convention (2026-10-01).

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC
Signatures valid until: 5 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
23434	RSASHA256 (8)	SHA256 4BA721BB8DEEB179…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
23434	KSK (257)	RSASHA256 (8)
65478	ZSK (256)	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 23434 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Signatures valid until 2026-11-05 #30

The earliest DNSKEY/SOA signature expires at 2026-11-05 01:21 UTC.
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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

6 records at the apex

Found

Read from: 185.33.117.67:53

Type	Value	TTL
SOA	ns25.csv-networks.nl. root.uitzinnig.nl. 2026100101 3600 3600 1209600 1800	3600
NS	ns26.csv-networks.nl.	900
NS	ns25.csv-networks.nl.	900
A	84.244.151.43	900
MX	10 mail.uitzinnig.nl.	900
TXT	"v=spf1 a mx ip4:185.33.117.65 include:csv-networks.com ~all"	900

Checks

✓ TTLs within range #32

TTLs: A 15m, MX 15m, NS 15m. The NS TTL at the parent is 1h and in the zone 15m; 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.
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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