Domain report: vlinderstichting.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

pass

nsauth1.bit.nl, nsauth2.bit.nl, nsauth3.bitnl.eu

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: nsauth1.bit.nl, nsauth2.bit.nl, nsauth3.bitnl.eu
NS in the zone: nsauth1.bit.nl, nsauth2.bit.nl, nsauth3.bitnl.eu

Nameserver	Addresses	Network (AS)	Glue
nsauth1.bit.nl	213.136.12.51 2001:7b8:3:2c::53	AS12859 NL-BIT - BIT BV, NL AS12859 NL-BIT - BIT BV, NL	213.136.12.51 2001:7b8:3:2c::53
nsauth2.bit.nl	213.136.12.59 2001:7b8:3:2d::53	AS12859 NL-BIT - BIT BV, NL AS12859 NL-BIT - BIT BV, NL	213.136.12.59 2001:7b8:3:2d::53
nsauth3.bitnl.eu	85.17.15.88 2001:1af8:4700:a119:16:0:8517:1588	AS60781 LEASEWEB-NL-AMS-01 - LeaseWeb Netherlands B.V., NL AS60781 LEASEWEB-NL-AMS-01 - LeaseWeb Netherlands B.V., NL	-

Checks

✓ 3 nameservers #6

Delegated to nsauth1.bit.nl, nsauth2.bit.nl, nsauth3.bitnl.eu.
✓ 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 2 IPv4 /24s and 2 IPv6 /48s.
✓ 2 autonomous systems #11

The nameservers are spread over: AS12859 (NL-BIT - BIT BV, NL): 4 addresses; AS60781 (LEASEWEB-NL-AMS-01 - LeaseWeb Netherlands B.V., NL): 2 addresses.
✓ Nameserver names under 2 TLDs #12

Nameserver names use the TLDs .eu, .nl.
✓ 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
nsauth1.bit.nl 213.136.12.51	NOERROR, 14 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.9.15 (built May 11 2026 09:10:06 by root@localhost)
nsauth1.bit.nl 2001:7b8:3:2c::53	NOERROR, 14 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.9.15 (built May 11 2026 09:10:06 by root@localhost)
nsauth2.bit.nl 213.136.12.59	NOERROR, 11 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.9.15 (built May 11 2026 09:10:06 by root@localhost)
nsauth2.bit.nl 2001:7b8:3:2d::53	NOERROR, 10 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.9.15 (built May 11 2026 09:10:06 by root@localhost)
nsauth3.bitnl.eu 85.17.15.88	NOERROR, 11 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.9.11 (built Oct 15 2025 10:16:15 by root@localhost)
nsauth3.bitnl.eu 2001:1af8:4700:a119:16:0:8517:1588	NOERROR, 11 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.9.11 (built Oct 15 2025 10:16:15 by root@localhost)

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: nsauth1.bit.nl: "PowerDNS Authoritative Server 4.9.15 (built May 11 2026 09:10:06 by root@localhost)"; nsauth2.bit.nl: "PowerDNS Authoritative Server 4.9.15 (built May 11 2026 09:10:06 by root@localhost)"; nsauth3.bitnl.eu: "PowerDNS Authoritative Server 4.9.11 (built Oct 15 2025 10:16:15 by root@localhost)". 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 2026092902 · primary nsauth1.bit.nl

Found

Primary (MNAME): nsauth1.bit.nl
Contact (RNAME): hostmaster.bit.nl
Serial: 2026092902
Refresh / retry: 28800 s / 7200 s
Expire: 604800 s
Negative TTL: 600 s

Serial per nameserver

Nameserver	Serial
nsauth1.bit.nl (213.136.12.51)	2026092902
nsauth1.bit.nl (2001:7b8:3:2c::53)	2026092902
nsauth2.bit.nl (213.136.12.59)	2026092902
nsauth2.bit.nl (2001:7b8:3:2d::53)	2026092902
nsauth3.bitnl.eu (85.17.15.88)	2026092902
nsauth3.bitnl.eu (2001:1af8:4700:a119:16:0:8517:1588)	2026092902

Checks

✓ Serial 2026092902 everywhere #22

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

SOA refresh 8h, retry 2h, expire 7d, negative TTL 10m.
✓ Primary is a public nameserver #24

The primary nameserver nsauth1.bit.nl is one of the listed nameservers.
✓ Contact hostmaster@bit.nl #25

The SOA RNAME hostmaster.bit.nl means hostmaster@bit.nl.
✓ Date-based serial #26

The serial 2026092902 follows the YYYYMMDDnn convention (2026-09-29).

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: 29 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
34098	ECDSAP256SHA256 (13)	SHA256 7CB4E9256C9CD74E…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
34098	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 34098 (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.
✓ NSEC3 as recommended #31

The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

info

9 records at the apex

Found

Read from: 213.136.12.51:53

Type	Value	TTL
SOA	nsauth1.bit.nl. hostmaster.bit.nl. 2026092902 28800 7200 604800 600	600
NS	nsauth1.bit.nl.	600
NS	nsauth3.bitnl.eu.	600
NS	nsauth2.bit.nl.	600
A	136.144.146.13	600
MX	0 vlinderstichting-nl.mail.protection.outlook.com.	600
TXT	"v=spf1 include:spf.eu.exclaimer.net include:mailswitch.nl include:_spf.createsend.com include:spf.protection.outlook.com include:spf.flowmailer.net ip4:92.66.138.16 ip4:84.247.13.241 ip4:136.144.177.75 ip4:37.97.176.188 ip4:136.144.146.13 -all"	300
TXT	"google-site-verification=O5akRSMSi9qdKg_6pELGkjm8h0VyP04mvLm2YyLmLOE"	600
TXT	"De Vlinderstichting (10429)"	600

Checks

✓ TTLs within range #32

TTLs: A 10m, MX 10m, NS 10m. The NS TTL at the parent is 1h and in the zone 10m; 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.
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