sidnlabs.nl

Checked 22 October 2026, 15:50 UTC · via 8.8.8.8
!Passed with warnings
28 passed 1 warning 0 failed 4 info

Registration

info

.nl country-code

Found

TLD
.nl (country-code)
ICANN policies apply
no
Lookup error: https://rdap.sidn.nl/domain/sidnlabs.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/sidnlabs.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
NameserverAddressesNetwork (AS)Glue
ns1.sidn.nl192.174.68.144 2001:67c:1bc::144AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT192.174.68.144 2001:67c:1bc::144
ns1.sidnlabs.nl94.198.159.8 2a00:d78:0:712:94:198:159:8AS1140 SIDN - Stichting Internet Domeinregistratie Nederland, NL AS1140 SIDN - Stichting Internet Domeinregistratie Nederland, NL94.198.159.8 2a00:d78:0:712:94:198:159:8
ns2.sidn.nl176.97.158.144 2001:67c:10b8::144AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT AS1921 RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT176.97.158.144 2001:67c:10b8::144
ns2.sidnlabs.nl194.0.28.11 2001:678:2c:0:194:0:28:11AS48283 SIDN-ANYCAST - Stichting Internet Domeinregistratie Nederland, NL AS48283 SIDN-ANYCAST - Stichting Internet Domeinregistratie Nederland, NL194.0.28.11 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.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns1.sidnlabs.nl, ns2.sidnlabs.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 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

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.sidn.nl 192.174.68.144NOERROR, 5 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns1.sidn.nl 2001:67c:1bc::144NOERROR, 5 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns1.sidnlabs.nl 94.198.159.8NOERROR, 11 ms, authoritativenoyes / yesrefused9.20.30
ns1.sidnlabs.nl 2a00:d78:0:712:94:198:159:8NOERROR, 12 ms, authoritativenoyes / yesrefused9.20.30
ns2.sidn.nl 176.97.158.144NOERROR, 13 ms, authoritativenoyes / yesrefusedreg-wie1
ns2.sidn.nl 2001:67c:10b8::144NOERROR, 12 ms, authoritativenoyes / yesrefusedreg-wie1
ns2.sidnlabs.nl 194.0.28.11NOERROR, 9 ms, authoritativenoyes / yesrefusedKnot DNS 3.6.2
ns2.sidnlabs.nl 2001:678:2c:0:194:0:28:11NOERROR, 8 ms, authoritativenoyes / yesrefusedKnot 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 3.6.2". 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 46140 · primary ns1.sidnlabs.nl

Found

Primary (MNAME)
ns1.sidnlabs.nl
Contact (RNAME)
hostmaster.sidn.nl
Serial
46140
Refresh / retry
14400 s / 3600 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
ns1.sidn.nl (192.174.68.144)46140
ns1.sidn.nl (2001:67c:1bc::144)46140
ns1.sidnlabs.nl (94.198.159.8)46140
ns1.sidnlabs.nl (2a00:d78:0:712:94:198:159:8)46140
ns2.sidn.nl (176.97.158.144)46140
ns2.sidn.nl (2001:67c:10b8::144)46140
ns2.sidnlabs.nl (194.0.28.11)46140
ns2.sidnlabs.nl (2001:678:2c:0:194:0:28:11)46140

Checks

  • ✓ Serial 46140 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ 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 46140 is a plain counter.

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
0 iterations, 0-byte salt
Signatures valid until
4 November 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
11261ECDSAP256SHA256 (13)SHA256 CC791BA77B860ED3…yes

DNSKEY in the zone

Key tagRoleAlgorithm
11261KSK (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 11261 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Signatures valid until 2026-11-04 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-04 00:24 UTC.
  • ✓ NSEC3 as recommended #31
    The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

info

19 records at the apex

Found

Read from
192.174.68.144:53
TypeValueTTL
SOAns1.sidnlabs.nl. hostmaster.sidn.nl. 46140 14400 3600 604800 3003600
NSns1.sidn.nl.3600
NSns1.sidnlabs.nl.3600
NSns2.sidn.nl.3600
NSns2.sidnlabs.nl.3600
A34.111.90.633600
AAAA2600:1901:0:8ca2::3600
MX0 .3600
TXT"OSSRH-49190"3600
TXT"HARICA-HVlKQWir5RaELa4oTUe"3600
TXT"HARICA-hWfjvwu1GPiOytlELIi"3600
TXT"HARICA-sTTmvQk355n09Hd07Ob"3600
TXT"scion=73-215088,2001:67c:e6c:1700:aaaa:aaaa:73:80"3600
TXT"ENS1 dnsname.ens.eth 0x8d988EB0D0Eb50b01478d56B1E0E031648c138df"3600
TXT"google-site-verification=T3NHyw8XCEaEKa3Rvm9VnYK7jVQexgcrXQhrx5ATdbk"3600
TXT"v=spf1 ip4:94.198.159.0/24 ip4:145.102.0.174 ip6:2a00:d78:0:700::/56 ip6:2001:67c:e6c:1700::28 ~all"3600
CAA0 iodef "mailto:abuse@sidn.nl"3600
CAA0 issue "harica.gr"3600
CAA0 issue "letsencrypt.org"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: harica.gr, letsencrypt.org.