nlnetlabs.nl

Checked 21 October 2026, 21:23 UTC · via 8.8.8.8
!Passed with warnings
26 passed 3 warnings 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/nlnetlabs.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/nlnetlabs.nl returned HTTP 429
    #3

Delegation

pass

anyns.pch.net, ns.nlnetlabs.nl, ns1.sidn.nl, ns2.sidn.nl

Found

Parent zone
nl
Delegation from
ns1.dns.nl (194.0.28.53)
NS at the parent
anyns.pch.net, ns.nlnetlabs.nl, ns1.sidn.nl, ns2.sidn.nl
NS in the zone
anyns.pch.net, ns.nlnetlabs.nl, ns1.sidn.nl, ns2.sidn.nl
NameserverAddressesNetwork (AS)Glue
anyns.pch.net204.61.216.4 2001:500:14:6004:ad::1AS42 WOODYNET-1 - WoodyNet, Inc., US AS42 WOODYNET-1 - WoodyNet, Inc., US-
ns.nlnetlabs.nl185.49.140.60 2a04:b900::8:0:0:60AS8587 Infracom-AS - Infracom Holding B.V., NL AS8587 Infracom-AS - Infracom Holding B.V., NL185.49.140.60 2a04:b900::8:0:0:60
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
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

Checks

  • ✓ 4 nameservers #6
    Delegated to anyns.pch.net, ns.nlnetlabs.nl, ns1.sidn.nl, ns2.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: ns.nlnetlabs.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: AS1921 (RCODEZERO-ANYCAST-SEC1-TLD - ipcom GmbH, AT): 4 addresses; AS42 (WOODYNET-1 - WoodyNet, Inc., US): 2 addresses; AS8587 (Infracom-AS - Infracom Holding B.V., NL): 2 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .net, .nl.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
anyns.pch.net 204.61.216.4NOERROR, 11 ms, authoritativenoyes / yesrefusedhost
anyns.pch.net 2001:500:14:6004:ad::1NOERROR, 20 ms, authoritativenoyes / yesrefusedhost
ns.nlnetlabs.nl 185.49.140.60NOERROR, 11 ms, authoritativenoyes / yesrefusedNSD 4.3.8
ns.nlnetlabs.nl 2a04:b900::8:0:0:60NOERROR, 9 ms, authoritativenoyes / yesrefusedNSD 4.3.8
ns1.sidn.nl 192.174.68.144NOERROR, 3 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns1.sidn.nl 2001:67c:1bc::144NOERROR, 4 ms, authoritativenoyes / yesrefusedRcodeZero DNS
ns2.sidn.nl 176.97.158.144NOERROR, 12 ms, authoritativenoyes / yesrefusedreg-wie1
ns2.sidn.nl 2001:67c:10b8::144NOERROR, 11 ms, authoritativenoyes / yesrefusedreg-wie1

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: ns.nlnetlabs.nl: "NSD 4.3.8". 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 2026101602 · primary ns.nlnetlabs.nl

Found

Primary (MNAME)
ns.nlnetlabs.nl
Contact (RNAME)
hostmaster.nlnetlabs.nl
Serial
2026101602
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
240 s

Serial per nameserver

NameserverSerial
anyns.pch.net (204.61.216.4)2026101602
anyns.pch.net (2001:500:14:6004:ad::1)2026101602
ns.nlnetlabs.nl (185.49.140.60)2026101602
ns.nlnetlabs.nl (2a04:b900::8:0:0:60)2026101602
ns1.sidn.nl (192.174.68.144)2026101602
ns1.sidn.nl (2001:67c:1bc::144)2026101602
ns2.sidn.nl (176.97.158.144)2026101602
ns2.sidn.nl (2001:67c:10b8::144)2026101602

Checks

  • ✓ Serial 2026101602 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    negative caching TTL (minimum) 4m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 8h, retry 2h, expire 7d, negative TTL 4m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.nlnetlabs.nl is one of the listed nameservers.
  • ✓ Contact hostmaster@nlnetlabs.nl #25
    The SOA RNAME hostmaster.nlnetlabs.nl means hostmaster@nlnetlabs.nl.
  • ✓ Date-based serial #26
    The serial 2026101602 follows the YYYYMMDDnn convention (2026-10-16).

DNSSEC

info

Signed, DS published at parent

Found

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

DS at the parent

Key tagAlgorithmDigestMatches a key
50602RSASHA256 (8)SHA256 FA8EE175C47325F4…yes

DNSKEY in the zone

Key tagRoleAlgorithm
42393ZSK (256)RSASHA256 (8)
50602KSK (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 50602 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: RSASHA256 (8).
  • ✓ Signatures valid until 2026-11-13 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-13 08:45 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

warn

14 records at the apex

Found

Read from
204.61.216.4:53
TypeValueTTL
SOAns.nlnetlabs.nl. hostmaster.nlnetlabs.nl. 2026101602 28800 7200 604800 240240
NSns.nlnetlabs.nl.240
NSns2.sidn.nl.240
NSns1.sidn.nl.240
NSanyns.pch.net.240
A128.140.76.106240
AAAA2a01:4f8:c0c:cdfa::1240
MX10 mxext3.mailbox.org.240
MX10 mxext2.mailbox.org.240
MX10 mxext1.mailbox.org.240
MX10 mxext4.mailbox.org.240
TXT"1password-site-verification=QAXPQAT46NGABHYNFZ5HGZUELQ"240
TXT"v=spf1 +a include:_spf.google.com include:mailbox.org ip4:185.49.140.0/22 ip6:2a04:b900::/29 ~all"240
TXT"Stichting NLnet Labs zone"240

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (4m), AAAA (4m), MX (4m), NS (4m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1h and in the zone 4m; resolvers may use either.
    #32
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • i
    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