Domain report: internet.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

ns1.sidn.nl, ns1.sidnlabs.nl, ns2.sidn.nl, ns2.sidnlabs.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns1.sidn.nl, ns1.sidnlabs.nl, ns2.sidn.nl, ns2.sidnlabs.nl
NS in the zone: ns1.sidn.nl, ns1.sidnlabs.nl, ns2.sidn.nl, ns2.sidnlabs.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
ns1.sidnlabs.nl	94.198.159.8 2a00:d78:0:712:94:198:159:8	AS1140 SIDN - Stichting Internet Domeinregistratie Nederland, NL AS1140 SIDN - Stichting Internet Domeinregistratie Nederland, NL	94.198.159.8 2a00:d78:0:712:94:198:159:8
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
ns2.sidnlabs.nl	194.0.28.11 2001:678:2c:0:194:0:28:11	AS48283 SIDN-ANYCAST - Stichting Internet Domeinregistratie Nederland, NL AS48283 SIDN-ANYCAST - Stichting Internet Domeinregistratie Nederland, NL	194.0.28.11 2001:678:2c:0:194:0:28:11

Checks

✓ 4 nameservers #6

Delegated to ns1.sidn.nl, ns1.sidnlabs.nl, ns2.sidn.nl, ns2.sidnlabs.nl.
✓ 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 4 IPv4 /24s and 4 IPv6 /48s.
✓ 3 autonomous systems #11

The nameservers are spread over: AS1140 (SIDN - Stichting Internet Domeinregistratie Nederland, NL): 2 addresses; 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

8 of 8 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
ns1.sidnlabs.nl 94.198.159.8	NOERROR, 11 ms, authoritative	no	yes / yes	refused	9.20.30
ns1.sidnlabs.nl 2a00:d78:0:712:94:198:159:8	NOERROR, 11 ms, authoritative	no	yes / yes	refused	9.20.30
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
ns2.sidnlabs.nl 194.0.28.11	NOERROR, 9 ms, authoritative	no	yes / yes	refused	Knot DNS 3.6.1
ns2.sidnlabs.nl 2001:678:2c:0:194:0:28:11	NOERROR, 4 ms, authoritative	no	yes / yes	refused	Knot DNS 3.6.2

Checks

✓ All respond #14

All 8 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: ns1.sidnlabs.nl: "9.20.30"; ns2.sidnlabs.nl: "Knot DNS 3.6.1"; ns2.sidnlabs.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

warn

serial 10321 · primary ns1.sidnlabs.nl

Found

Primary (MNAME): ns1.sidnlabs.nl
Contact (RNAME): hostmaster.sidn.nl
Serial: 10321
Refresh / retry: 14400 s / 3600 s
Expire: 604800 s
Negative TTL: 300 s

Serial per nameserver

Nameserver	Serial
ns1.sidn.nl (192.174.68.144)	10321
ns1.sidn.nl (2001:67c:1bc::144)	10321
ns1.sidnlabs.nl (94.198.159.8)	10321
ns1.sidnlabs.nl (2a00:d78:0:712:94:198:159:8)	10321
ns2.sidn.nl (176.97.158.144)	10321
ns2.sidn.nl (2001:67c:10b8::144)	10321
ns2.sidnlabs.nl (194.0.28.11)	10315
ns2.sidnlabs.nl (2001:678:2c:0:194:0:28:11)	10315

Checks

!

Serials differ

The nameservers serve different versions of the zone: 10315 on ns2.sidnlabs.nl (194.0.28.11), ns2.sidnlabs.nl (2001:678:2c:0:194:0:28:11); 10321 on ns1.sidn.nl (192.174.68.144), ns1.sidn.nl (2001:67c:1bc::144), ns1.sidnlabs.nl (94.198.159.8), ns1.sidnlabs.nl (2a00:d78:0:712:94:198:159:8), ns2.sidn.nl (176.97.158.144), ns2.sidn.nl (2001:67c:10b8::144). This is normal for a few minutes after a change; if it lasts, zone transfers to the secondaries are failing.

#22
✓ Timers within recommendations #23

SOA refresh 4h, retry 1h, expire 7d, negative TTL 5m.
✓ Primary is a public nameserver #24

The primary nameserver ns1.sidnlabs.nl is one of the listed nameservers.
✓ Contact hostmaster@sidn.nl #25

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

The serial 10321 is a plain counter.

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC
Signatures valid until: 31 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
22707	ECDSAP256SHA256 (13)	SHA256 A69C3D2D414E4EF8…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
22707	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 22707 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Signatures valid until 2026-10-31 #30

The earliest DNSKEY/SOA signature expires at 2026-10-31 17:33 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

info

17 records at the apex

Found

Read from: 192.174.68.144:53

Type	Value	TTL
SOA	ns1.sidnlabs.nl. hostmaster.sidn.nl. 10321 14400 3600 604800 300	3600
NS	ns1.sidn.nl.	3600
NS	ns1.sidnlabs.nl.	3600
NS	ns2.sidn.nl.	3600
NS	ns2.sidnlabs.nl.	3600
A	62.204.66.10	3600
AAAA	2a00:d00:ff:162:62:204:66:10	3600
MX	10 vmx01.prolocation.nl.	3600
MX	10 vmx02.prolocation.nl.	3600
MX	10 vmx03.prolocation.net.	3600
TXT	"v=spf1 a include:spfinc.prolocation.net ~all"	3600
CAA	0 iodef "mailto:question@internet.nl"	3600
CAA	0 issue "letsencrypt.org;validationmethods=http-01,tls-alpn-01"	3600
CAA	0 issue "sectigo.com"	3600
CAA	0 issuevmc ";"	3600
CAA	0 issuemail ";"	3600
CAA	0 issuewild ";"	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.
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: letsencrypt.org, sectigo.com, none (issuance forbidden).