Domain report: sidn.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

ns1.sidn.nl, ns2.sidn.nl, ns3.sidn.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns1.sidn.nl, ns2.sidn.nl, ns3.sidn.nl
NS in the zone: ns1.sidn.nl, ns2.sidn.nl, ns3.sidn.nl

Nameserver	Addresses	Network (AS)	Glue
ns1.sidn.nl	192.174.68.144 2001:67c:1bc::144	AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT	192.174.68.144 2001:67c:1bc::144
ns2.sidn.nl	176.97.158.144 2001:67c:10b8::144	AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT	176.97.158.144 2001:67c:10b8::144
ns3.sidn.nl	194.0.28.10 2001:678:2c:0:194:0:28:10	AS48283 SIDN-ANYCAST - Stichting Internet Domeinregistratie Nederland, NL AS48283 SIDN-ANYCAST - Stichting Internet Domeinregistratie Nederland, NL	194.0.28.10 2001:678:2c:0:194:0:28:10

Checks

✓ 3 nameservers #6

Delegated to ns1.sidn.nl, ns2.sidn.nl, ns3.sidn.nl.
✓ Parent and zone agree #7

The parent delegation and the zone's NS records list the same nameservers.
✓ Glue present and correct #8

Glue is published for the nameservers inside the zone: ns1.sidn.nl, ns2.sidn.nl, ns3.sidn.nl.
✓ 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 3 IPv4 /24s and 3 IPv6 /48s.
✓ 2 autonomous systems #11

The nameservers are spread over: AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 4 addresses; AS48283 (SIDN-ANYCAST - Stichting Internet Domeinregistratie Nederland, NL): 2 addresses.
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

warn

6 of 6 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.sidn.nl 192.174.68.144	NOERROR, 4 ms, authoritative	no	yes / yes	refused	RcodeZero DNS
ns1.sidn.nl 2001:67c:1bc::144	NOERROR, 4 ms, authoritative	no	yes / yes	refused	RcodeZero DNS
ns2.sidn.nl 176.97.158.144	NOERROR, 12 ms, authoritative	no	yes / yes	refused	reg-wie1
ns2.sidn.nl 2001:67c:10b8::144	NOERROR, 12 ms, authoritative	no	yes / yes	refused	reg-wie1
ns3.sidn.nl 194.0.28.10	NOERROR, 3 ms, authoritative	no	yes / yes	refused	Knot DNS 3.6.2
ns3.sidn.nl 2001:678:2c:0:194:0:28:10	NOERROR, 4 ms, authoritative	no	yes / yes	refused	Knot DNS 3.6.2

Checks

✓ All respond #14

All 6 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: ns3.sidn.nl: "Knot DNS 3.6.2". 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 1791355407 · primary ns3.sidn.nl

Found

Primary (MNAME): ns3.sidn.nl
Contact (RNAME): hostmaster.sidn.nl
Serial: 1791355407
Refresh / retry: 14400 s / 3600 s
Expire: 3456000 s
Negative TTL: 300 s

Serial per nameserver

Nameserver	Serial
ns1.sidn.nl (192.174.68.144)	1791355407
ns1.sidn.nl (2001:67c:1bc::144)	1791355407
ns2.sidn.nl (176.97.158.144)	1791355407
ns2.sidn.nl (2001:67c:10b8::144)	1791355407
ns3.sidn.nl (194.0.28.10)	1791355407
ns3.sidn.nl (2001:678:2c:0:194:0:28:10)	1791355407

Checks

✓ Serial 1791355407 everywhere #22

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

SOA refresh 4h, retry 1h, expire 40d, negative TTL 5m.
✓ Primary is a public nameserver #24

The primary nameserver ns3.sidn.nl is one of the listed nameservers.
✓ Contact hostmaster@sidn.nl #25

The SOA RNAME hostmaster.sidn.nl means hostmaster@sidn.nl.
✓ Timestamp serial #26

The serial 1791355407 is a Unix timestamp (2026-10-07 06:43 UTC).

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC
Signatures valid until: 29 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
62949	ECDSAP256SHA256 (13)	SHA256 FBF66B8D019C1EEC…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
30794	ZSK (256)	ECDSAP256SHA256 (13)
62949	KSK (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 62949 (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.
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

pass

22 records at the apex

Found

Read from: 192.174.68.144:53

Type	Value	TTL
SOA	ns3.sidn.nl. hostmaster.sidn.nl. 1791355407 14400 3600 3456000 300	3600
NS	ns1.sidn.nl.	3600
NS	ns2.sidn.nl.	3600
NS	ns3.sidn.nl.	3600
A	34.111.90.63	3600
AAAA	2600:1901:0:8ca2::	3600
MX	0 sidn-nl.v-v1.mx.microsoft.	3600
TXT	"HARICA-d0FqAJx3Xg16m7TWkUz"	60
TXT	"b49e83a3cf3f49b49be0ceea668e8457"	60
TXT	"apple-domain-verification=VfW6PNm8hVwB49dm"	60
TXT	"google-site-verification=UgJBr_GdHnW8WlMHFlo59LLMiNz0g-T3g6ijOs7KBWE"	60
TXT	"google-site-verification=nGdTpBOjSS2sHxxqhEE9Tj3xcK5X4-lF9YLqtYmXbwI"	60
TXT	"DomainVerification=94J3KBJIL96UFC6L3FMIHJ07M95PUUE5CZKNBBDKJOH2PYF1MQGVQRDA0ZIE58II"	60
TXT	"v=spf1 a:ops-relay03-p.sidn.nl a:ops-relay04-p.sidn.nl a:ops-relayf03-p.sidn.nl a:ops-relayf04-p.sidn.nl a:ops-monext02-p.sidn.nl ip4:94.198.154.51 include:spf.protection.outlook.com include:secumail.email ~all"	60
CAA	0 iodef "mailto:abuse@sidn.nl"	3600
CAA	0 issue "digicert.com; cansignhttpexchanges=yes"	3600
CAA	0 issue "harica.gr"	3600
CAA	0 issue "letsencrypt.org"	3600
CAA	0 issue "pki.goog; cansignhttpexchanges=yes"	3600
CAA	0 issue "quovadisglobal.com"	3600
CAA	0 issue "sectigo.com"	3600
CAA	0 issuemail "harica.gr"	3600

Checks

✓ TTLs within range #32

TTLs: A 1h, AAAA 1h, 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.
✓ CAA restricts issuance #35

Certificates may be issued by: digicert.com, harica.gr, letsencrypt.org, pki.goog, quovadisglobal.com, sectigo.com.