Domain report: pfzw.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

warn

ns2.kpn.net, ns4.kpn.net

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns2.kpn.net, ns4.kpn.net
NS in the zone: ns2.kpn.net, ns4.kpn.net

Nameserver	Addresses	Network (AS)	Glue
ns2.kpn.net	194.151.228.58 2a02:a47f:ac:1::253	AS1136 KPN - KPN B.V., NL AS1136 KPN - KPN B.V., NL	-
ns4.kpn.net	194.151.228.29 2a02:a47f:ac:1::453	AS1136 KPN - KPN B.V., NL AS1136 KPN - KPN B.V., NL	-

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns2.kpn.net, ns4.kpn.net.

#6
✓ 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 one network

all IPv4 addresses are in 194.151.228.0/24; all IPv6 addresses are in 2a02:a47f:ac::/48. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).

#10
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS1136 (KPN - KPN B.V., NL): 4 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

#11
i

All nameserver names under .net

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

pass

4 of 4 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns2.kpn.net 194.151.228.58	NOERROR, 11 ms, authoritative	no	yes / yes	refused	-
ns2.kpn.net 2a02:a47f:ac:1::253	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-
ns4.kpn.net 194.151.228.29	NOERROR, 11 ms, authoritative	no	yes / yes	refused	-
ns4.kpn.net 2a02:a47f:ac:1::453	NOERROR, 13 ms, authoritative	no	yes / yes	refused	-

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.
✓ No version disclosed #17

The nameservers don't reveal their software version.
✓ 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 2021156721 · primary ns2.kpn.net

Found

Primary (MNAME): ns2.kpn.net
Contact (RNAME): zonemaster.kpn.com
Serial: 2021156721
Refresh / retry: 10800 s / 1080 s
Expire: 2419200 s
Negative TTL: 900 s

Serial per nameserver

Nameserver	Serial
ns2.kpn.net (194.151.228.58)	2021156721
ns2.kpn.net (2a02:a47f:ac:1::253)	2021156721
ns4.kpn.net (194.151.228.29)	2021156721
ns4.kpn.net (2a02:a47f:ac:1::453)	2021156721

Checks

✓ Serial 2021156721 everywhere #22

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

SOA refresh 3h, retry 18m, expire 28d, negative TTL 15m.
✓ Primary is a public nameserver #24

The primary nameserver ns2.kpn.net is one of the listed nameservers.
✓ Contact zonemaster@kpn.com #25

The SOA RNAME zonemaster.kpn.com means zonemaster@kpn.com.
✓ Timestamp serial #26

The serial 2021156721 is a Unix timestamp (2034-01-18 00:25 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

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

DS at the parent

Key tag	Algorithm	Digest	Matches a key
7255	RSASHA256 (8)	SHA256 719869B8764209F5…	NO
30481	RSASHA256 (8)	SHA256 78C8BD5DE268D851…	NO
49864	RSASHA256 (8)	SHA256 BA0D479D43FC2E4B…	yes
12049	RSASHA256 (8)	SHA256 986EC45349E9C4E6…	NO

DNSKEY in the zone

Key tag	Role	Algorithm
47853	ZSK (256)	RSASHA256 (8)
49864	KSK (257)	RSASHA256 (8)
18804	ZSK (256)	RSASHA256 (8)

Checks

✓ Signed and validated #27

The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
i

Unused DS records

These DS records match no key in the zone: key tag 7255 (SHA256), key tag 30481 (SHA256), key tag 12049 (SHA256). That is normal during a key rollover; otherwise remove them.

#28
✓ 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 21:42 UTC and expires at 2026-10-25 21:47 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations and a 10-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

25 records at the apex

Found

Read from: 194.151.228.58:53

Type	Value	TTL
SOA	ns2.kpn.net. zonemaster.kpn.com. 2021156721 10800 1080 2419200 900	300
NS	ns4.kpn.net.	300
NS	ns2.kpn.net.	300
A	145.4.230.12	300
MX	10 pfzw-nl.mail.protection.outlook.com.	300
TXT	"MS=ms25911501"	300
TXT	"_aafjb3kygrciens06ioxaz4873qibh9"	300
TXT	"d365mktkey=32i8ecakvudw49u4oe0kwl8vr"	300
TXT	"_pzi0p99bntwfwpkb0hg10kzocwrpxcn"	300
TXT	"d365mktkey=Thh2TajL8gtdxwNzajKeJmd2u0y12aZMjzTLe2KdLdIx"	300
TXT	"Foxit-domain-verification=016f596b7d83dbba187ca1d19453a24d"	300
TXT	"d365mktkey=30l64j338jgkrcrwflakr7k22"	300
TXT	"QuoVadis=5555f93d-a40c-4dc3-8624-62eae9b37cfe"	300
TXT	"d365mktkey=6fgpy62it38ggtlhpx9o4wst"	300
TXT	"d365mktkey=4e3oec7uicx8c9ovp0qtyschg"	300
TXT	"11r7rkUMog3hJYkG4MFnlwaaMq5SAaUQX3tmypTntTpsYfIlZkQ5ouXEhMMKjHQHI5Zx9vNSNKAEBNC+1hiSUQ=="	300
TXT	"google-site-verification=Skaxmng0NeMOXbO1_EwFWYf1QdsgwpTAtQ3gHPqtDHQ"	300
TXT	"v=spf1 mx include:spf.protection.outlook.com include:sendgrid.net ip4:145.4.224.3 ip4:136.144.240.36 ip4:34.240.60.35 ip4:34.253.252.142 ip4:18.203.163.221 ip4:54.74.218.107 -all"	300
CAA	0 issue "pki.goog"	300
CAA	0 issue "www.pkioverheid.nl"	300
CAA	0 issue "kpn.com"	300
CAA	0 issue "digicert.com"	300
CAA	0 issue "globalsign.com"	300
CAA	0 issuewild ";"	300
CAA	0 iodef "mailto:opsec@pggm.nl"	300

Checks

✓ TTLs within range #32

TTLs: A 5m, MX 5m, NS 5m. The NS TTL at the parent is 1h and in the zone 5m; 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: pki.goog, www.pkioverheid.nl, kpn.com, digicert.com, globalsign.com, none (issuance forbidden).