Domain report: vpro.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

ns.vpro.nl, ns1.openprovider.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns.vpro.nl, ns1.openprovider.nl
NS in the zone: ns.vpro.nl, ns1.openprovider.nl

Nameserver	Addresses	Network (AS)	Glue
ns.vpro.nl	145.58.168.42 2a02:458:931:300::11	AS25182 PUBLIEKE-OMROEP-AS - Stichting Nederlandse Publieke Omroep, NL AS25182 PUBLIEKE-OMROEP-AS - Stichting Nederlandse Publieke Omroep, NL	145.58.168.42 2a02:458:931:300::11
ns1.openprovider.nl	162.159.26.10 2400:cb00:2049:1::a29f:1a0a	AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US	-

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns.vpro.nl, ns1.openprovider.nl.

#6
✓ 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.vpro.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 2 IPv4 /24s and 2 IPv6 /48s.
✓ 2 autonomous systems #11

The nameservers are spread over: AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 2 addresses; AS25182 (PUBLIEKE-OMROEP-AS - Stichting Nederlandse Publieke Omroep, 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

4 of 4 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns.vpro.nl 145.58.168.42	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-
ns.vpro.nl 2a02:458:931:300::11	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-
ns1.openprovider.nl 162.159.26.10	NOERROR, 32 ms, authoritative	no	yes / yes	refused	2026.10.8
ns1.openprovider.nl 2400:cb00:2049:1::a29f:1a0a	NOERROR, 32 ms, authoritative	no	yes / yes	refused	2026.10.8

Checks

✓ All respond #14

All 4 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.openprovider.nl: "2026.10.8". 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 2025275956 · primary ns.vpro.nl

Found

Primary (MNAME): ns.vpro.nl
Contact (RNAME): beheer.vpro.nl
Serial: 2025275956
Refresh / retry: 3600 s / 1800 s
Expire: 1209600 s
Negative TTL: 300 s

Serial per nameserver

Nameserver	Serial
ns.vpro.nl (145.58.168.42)	2025275956
ns.vpro.nl (2a02:458:931:300::11)	2025275956
ns1.openprovider.nl (162.159.26.10)	2025275949
ns1.openprovider.nl (2400:cb00:2049:1::a29f:1a0a)	2025275949

Checks

!

Serials differ

The nameservers serve different versions of the zone: 2025275949 on ns1.openprovider.nl (162.159.26.10), ns1.openprovider.nl (2400:cb00:2049:1::a29f:1a0a); 2025275956 on ns.vpro.nl (145.58.168.42), ns.vpro.nl (2a02:458:931:300::11). 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 1h, retry 30m, expire 14d, negative TTL 5m.
✓ Primary is a public nameserver #24

The primary nameserver ns.vpro.nl is one of the listed nameservers.
✓ Contact beheer@vpro.nl #25

The SOA RNAME beheer.vpro.nl means beheer@vpro.nl.
✓ Timestamp serial #26

The serial 2025275956 is a Unix timestamp (2034-03-06 16:39 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 2-byte salt
Signatures valid until: 25 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
22990	RSASHA256 (8)	SHA256 39375F475AFE6140…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
22770	ZSK (256)	RSASHA256 (8)
38661	ZSK (256)	RSASHA256 (8)
22990	KSK (257)	RSASHA256 (8)
49144	KSK (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 22990 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Short-lived signatures (online signing) #30

Signatures are valid for 96h0m0s and created on demand; the current one was made at 2026-10-21 17:12 UTC and expires at 2026-10-25 17:13 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations and a 2-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.

#31

Records

pass

26 records at the apex

Found

Read from: 145.58.168.42:53

Type	Value	TTL
SOA	ns.vpro.nl. beheer.vpro.nl. 2025275956 3600 1800 1209600 300	7200
NS	ns1.openprovider.nl.	7200
NS	ns.vpro.nl.	7200
A	216.150.1.1	7200
MX	10 de-smtp-inbound-2.mimecast.com.	300
MX	10 de-smtp-inbound-1.mimecast.com.	300
TXT	"google-site-verification=m1Am7Celuy7CZSq_9okH4VCAz9pupEVBYmG0CiDQgPw"	7200
TXT	"hibp-verify=dweb_9jsk5rrnj4xl1t7dgocybjh1"	7200
TXT	"facebook-domain-verification=suc2wayesrl4n86gozgse0phrgw7cg"	7200
TXT	"facebook-domain-verification=sl6silc6cdzqtrk1l6vku4jbo1e4st"	7200
TXT	"apple-domain-verification=aqjWCzy4tnEfR9Rx"	7200
TXT	"MS=ms84441314"	7200
TXT	"MS=E36946C5C42C3748759837C8756E1A589D4B2E9F"	7200
TXT	"626421108"	7200
TXT	"yeihh1V7QrLGe23Vuj1JwPizoUOvp/r5vYKmLCyMdowVqjbt2feKvJhnwZSwM1wrKxGg74lCmGF3qlS76DX4Bg=="	7200
TXT	"v=spf1 ip4:83.96.216.54/32 include:eu._netblocks.mimecast.com include:de._netblocks.mimecast.com include:spf.protection.outlook.com include:customers.clickdimensions.com include:spf.vpro.hypernode.io include:spf.smtp.net ip4:149.72.35.229 ~all"	7200
CAA	128 issue "amazontrust.com"	7200
CAA	128 issue "amazon.com"	7200
CAA	128 issuewild "sectigo.com"	7200
CAA	128 issue "sectigo.com"	7200
CAA	128 issuewild "letsencrypt.org"	7200
CAA	128 issue "letsencrypt.org"	7200
CAA	128 issuewild "digicert.com"	7200
CAA	128 issue "digicert.com"	7200
CAA	128 issue "amazonaws.com"	7200
CAA	128 issue "awstrust.com"	7200

Checks

✓ TTLs within range #32

TTLs: A 2h, MX 5m, NS 2h. The NS TTL at the parent is 1h and in the zone 2h; 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.
✓ CAA restricts issuance #35

Certificates may be issued by: amazontrust.com, amazon.com, sectigo.com, letsencrypt.org, digicert.com, amazonaws.com, awstrust.com.