Domain report: nvb.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

ns1.argewebhosting.eu, ns2.argewebhosting.com, ns3.argewebhosting.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns1.argewebhosting.eu, ns2.argewebhosting.com, ns3.argewebhosting.nl
NS in the zone: ns1.argewebhosting.eu, ns2.argewebhosting.com, ns3.argewebhosting.nl

Nameserver	Addresses	Network (AS)	Glue
ns1.argewebhosting.eu	31.25.98.210 2a05:1500:702:0:1c00:eff:fe00:ce	AS48635 CLDIN-NL - Your Hosting B.V., NL AS48635 CLDIN-NL - Your Hosting B.V., NL	-
ns2.argewebhosting.com	31.25.98.169 2a05:1500:702:0:1c00:13ff:fe00:a5	AS48635 CLDIN-NL - Your Hosting B.V., NL AS48635 CLDIN-NL - Your Hosting B.V., NL	-
ns3.argewebhosting.nl	92.63.168.137 2a05:1500:600:7:1c00:55ff:fe00:f1a	AS48635 CLDIN-NL - Your Hosting B.V., NL AS48635 CLDIN-NL - Your Hosting B.V., NL	92.63.168.137 2a05:1500:600:7:1c00:55ff:fe00:f1a

Checks

✓ 3 nameservers #6

Delegated to ns1.argewebhosting.eu, ns2.argewebhosting.com, ns3.argewebhosting.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 2 IPv4 /24s and 2 IPv6 /48s.
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS48635 (CLDIN-NL - Your Hosting B.V., NL): 6 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

#11
✓ Nameserver names under 3 TLDs #12

Nameserver names use the TLDs .com, .eu, .nl.
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

Nameservers

fail

6 of 6 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.argewebhosting.eu 31.25.98.210	NOERROR, 11 ms, authoritative	no	no / yes	refused	Served by PowerDNS - https://www.powerdns.com/
ns1.argewebhosting.eu 2a05:1500:702:0:1c00:eff:fe00:ce	NOERROR, 11 ms, authoritative	no	no / yes	refused	Served by PowerDNS - https://www.powerdns.com/
ns2.argewebhosting.com 31.25.98.169	NOERROR, 10 ms, authoritative	no	yes / yes	refused	Served by PowerDNS - https://www.powerdns.com/
ns2.argewebhosting.com 2a05:1500:702:0:1c00:13ff:fe00:a5	NOERROR, 11 ms, authoritative	no	yes / yes	refused	Served by PowerDNS - https://www.powerdns.com/
ns3.argewebhosting.nl 92.63.168.137	NOERROR, 10 ms, authoritative	no	yes / yes	refused	Served by PowerDNS - https://www.powerdns.com/
ns3.argewebhosting.nl 2a05:1500:600:7:1c00:55ff:fe00:f1a	NOERROR, 10 ms, authoritative	no	yes / yes	refused	Served by PowerDNS - https://www.powerdns.com/

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.
i

Identifying string disclosed

These nameservers answer version queries with a string that is not a version number: ns1.argewebhosting.eu: "Served by PowerDNS - https://www.powerdns.com/"; ns2.argewebhosting.com: "Served by PowerDNS - https://www.powerdns.com/"; ns3.argewebhosting.nl: "Served by PowerDNS - https://www.powerdns.com/".

#17
✓ Zone transfers refused #18

No nameserver allows a zone transfer to the public.
✗

No DNS over TCP

DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns1.argewebhosting.eu (31.25.98.210): read tcp 46.225.38.91:49892->31.25.98.210:53: i/o timeout; ns1.argewebhosting.eu (2a05:1500:702:0:1c00:eff:fe00:ce): read tcp [2a01:4f8:1c1c:eebf::1]:39448->[2a05:1500:702:0:1c00:eff:fe00:ce]:53: i/o timeout.

#19
✓ EDNS supported #20

All nameservers support EDNS(0).
✓ Public addresses #21

All nameserver addresses are publicly routable.

SOA

info

serial 2026101902 · primary ns01.is.nl

Found

Primary (MNAME): ns01.is.nl
Contact (RNAME): domain-admin.is.nl
Serial: 2026101902
Refresh / retry: 10800 s / 3600 s
Expire: 604800 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
ns1.argewebhosting.eu (31.25.98.210)	2026101902
ns1.argewebhosting.eu (2a05:1500:702:0:1c00:eff:fe00:ce)	2026101902
ns2.argewebhosting.com (31.25.98.169)	2026101902
ns2.argewebhosting.com (2a05:1500:702:0:1c00:13ff:fe00:a5)	2026101902
ns3.argewebhosting.nl (92.63.168.137)	2026101902
ns3.argewebhosting.nl (2a05:1500:600:7:1c00:55ff:fe00:f1a)	2026101902

Checks

✓ Serial 2026101902 everywhere #22

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

SOA refresh 3h, retry 1h, expire 7d, negative TTL 1h.
i

Hidden master

The primary nameserver ns01.is.nl is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.

#24
✓ Contact domain-admin@is.nl #25

The SOA RNAME domain-admin.is.nl means domain-admin@is.nl.
✓ Date-based serial #26

The serial 2026101902 follows the YYYYMMDDnn convention (2026-10-19).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 1 iterations, 1-byte salt
Signatures valid until: 5 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
26920	RSASHA256 (8)	SHA256 4B278BB785C82493…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
52554	ZSK (256)	RSASHA256 (8)
26920	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 26920 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Signatures valid until 2026-11-05 #30

The earliest DNSKEY/SOA signature expires at 2026-11-05 00:00 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 1 iteration and a 1-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

info

17 records at the apex

Found

Read from: 31.25.98.210:53

Type	Value	TTL
SOA	ns01.is.nl. domain-admin.is.nl. 2026101902 10800 3600 604800 3600	86400
NS	ns2.argewebhosting.com.	3600
NS	ns3.argewebhosting.nl.	3600
NS	ns1.argewebhosting.eu.	3600
A	195.216.246.81	600
MX	10 nvb-nl.mail.protection.outlook.com.	600
TXT	"CD0dLfbotH1m/jpNFKmwEl0q4WPQnDRxAnIb98F2gh1Ihhym8XwDuwYJjWnrIt94iL7B4yF+zSpuSif88A5lZg=="	600
TXT	"knowbe4-site-verification=2f6a639f5739b00f72d5706e29f6a964"	600
TXT	"kgXvlCb2/WhGgvdlVjfj3eqJZ3cD4AAOQ3JYIZS20zNHm4gPkLwxRy/QxmRRgs91IknfSG9roR3y3ys/8DQI8g=="	600
TXT	"apple-domain-verification=UmphnNAFP58VQ7Ct"	600
TXT	"nitro-verification-code=LTI3NDMxMzM1OTY0Mzc5NTg0MzM="	600
TXT	"brevo-code:babc96ee83b5a6e1ca7f70a1f2dcbc37"	600
TXT	"v=easydus; cg=d6c694a4-77ce-49aa-9b2e-21a48f4c6d12"	600
TXT	"protonmail-verification=dec03339fb6d6fc9413caf31c770a8aeb0377cfa"	600
TXT	"google-site-verification=eW3jauJmoAHEuvxoe9JJt8uIYTnDGCVjZJmxeGFBBOU"	600
TXT	"MS=ms63895073"	600
TXT	"v=spf1 include:_spf.exactonline.nl include:_spf.psm.knowbe4.com include:spf.rhm.hosting include:spf.mailjet.com ip4:188.122.89.132 ip4:52.49.201.246 ip4:87.233.201.41 ip4:83.136.17.52 ip4:87.233.83.34 ip4:62.112.224.5 ip4:87.233.253.202 ip4:195.193.168.47" " ip4:40.114.241.69 ip4:87.233.149.171 ip4:87.233.149.172 ip4:62.112.237.67 ip4:13.94.138.249 ip4:83.136.18.0/24 include:spf.protection.outlook.com include:spf.topdesk.net include:spf.by-tres.nl -all"	600

Checks

✓ TTLs within range #32

TTLs: A 10m, MX 10m, NS 1h.
✓ 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