Domain report: sudwestfryslan.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

ns01.frlinfra.nl, ns02.frlinfra.nl, ns04.frlinfra.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns01.frlinfra.nl, ns02.frlinfra.nl, ns04.frlinfra.nl
NS in the zone: ns01.frlinfra.nl, ns02.frlinfra.nl, ns04.frlinfra.nl

Nameserver	Addresses	Network (AS)	Glue
ns01.frlinfra.nl	185.114.197.53 2a07:3500:1c30:d053::53:1	AS207894 SWF - Gemeente Sudwest-Fryslan, NL AS207894 SWF - Gemeente Sudwest-Fryslan, NL	185.114.197.53 2a07:3500:1c30:d053::53:1
ns02.frlinfra.nl	185.114.197.54 2a07:3500:1c30:d053::53:2	AS207894 SWF - Gemeente Sudwest-Fryslan, NL AS207894 SWF - Gemeente Sudwest-Fryslan, NL	185.114.197.54 2a07:3500:1c30:d053::53:2
ns04.frlinfra.nl	37.34.56.236 2a01:7c8:aaad:1c9::53	AS20857 TRANSIP-AS - Signet B.V., NL AS20857 TRANSIP-AS - Signet B.V., NL	37.34.56.236 2a01:7c8:aaad:1c9::53

Checks

✓ 3 nameservers #6

Delegated to ns01.frlinfra.nl, ns02.frlinfra.nl, ns04.frlinfra.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.
✓ 2 autonomous systems #11

The nameservers are spread over: AS207894 (SWF - Gemeente Sudwest-Fryslan, NL): 4 addresses; AS20857 (TRANSIP-AS - Signet B.V., 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

6 of 6 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns01.frlinfra.nl 185.114.197.53	NOERROR, 16 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.9.17
ns01.frlinfra.nl 2a07:3500:1c30:d053::53:1	NOERROR, 15 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.9.17
ns02.frlinfra.nl 185.114.197.54	NOERROR, 16 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.9.17
ns02.frlinfra.nl 2a07:3500:1c30:d053::53:2	NOERROR, 16 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.9.17
ns04.frlinfra.nl 37.34.56.236	NOERROR, 11 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.9.17
ns04.frlinfra.nl 2a01:7c8:aaad:1c9::53	NOERROR, 12 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.9.17

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: ns01.frlinfra.nl: "PowerDNS Authoritative Server 4.9.17"; ns02.frlinfra.nl: "PowerDNS Authoritative Server 4.9.17"; ns04.frlinfra.nl: "PowerDNS Authoritative Server 4.9.17". 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 2026102201 · primary ns01.frlinfra.nl

Found

Primary (MNAME): ns01.frlinfra.nl
Contact (RNAME): servicedesk.sudwestfryslan.nl
Serial: 2026102201
Refresh / retry: 10800 s / 3600 s
Expire: 604800 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
ns01.frlinfra.nl (185.114.197.53)	2026102201
ns01.frlinfra.nl (2a07:3500:1c30:d053::53:1)	2026102201
ns02.frlinfra.nl (185.114.197.54)	2026102201
ns02.frlinfra.nl (2a07:3500:1c30:d053::53:2)	2026102201
ns04.frlinfra.nl (37.34.56.236)	2026102201
ns04.frlinfra.nl (2a01:7c8:aaad:1c9::53)	2026102201

Checks

✓ Serial 2026102201 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.
✓ Primary is a public nameserver #24

The primary nameserver ns01.frlinfra.nl is one of the listed nameservers.
✓ Contact servicedesk@sudwestfryslan.nl #25

The SOA RNAME servicedesk.sudwestfryslan.nl means servicedesk@sudwestfryslan.nl.
✓ Date-based serial #26

The serial 2026102201 follows the YYYYMMDDnn convention (2026-10-22).

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: 5 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
45089	ECDSAP256SHA256 (13)	SHA256 5351CFF8FBF4F435…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
45089	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 45089 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Signatures valid until 2026-11-05 #30

The earliest DNSKEY/SOA signature expires at 2026-11-05 00:00 UTC.
✓ NSEC3 as recommended #31

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

Records

info

18 records at the apex

Found

Read from: 185.114.197.53:53

Type	Value	TTL
SOA	ns01.frlinfra.nl. servicedesk.sudwestfryslan.nl. 2026102201 10800 3600 604800 3600	3600
NS	ns02.frlinfra.nl.	3600
NS	ns01.frlinfra.nl.	3600
NS	ns04.frlinfra.nl.	3600
A	62.221.214.28	3600
AAAA	2a0d:7980:202:0:1c00:aaff:fe00:1c9e	3600
MX	10 sudwestfryslan-nl.t-v1.mx.microsoft.	3600
TXT	"MS=FC393D78C63C171929010C127DDC6C7D79A0DE0B"	3600
TXT	"apple-domain-verification=OwRpV3AVuFGGgVVw"	3600
TXT	"v=spf1 include:_mx.iszf.nl -all"	3600
TXT	"google-site-verification=TorXpsZ2ndgtAfM3Z5SXxBa1PU4NnC7MyrpyYoGtfmc"	3600
CAA	0 issue "letsencrypt.org"	3600
CAA	0 issue "amazon.com"	3600
CAA	0 issue "kpn.com"	3600
CAA	0 iodef "mailto:informatiebeveiliging@sudwestfryslan.nl"	3600
CAA	0 issue "sectigo.com"	3600
CAA	0 iodef "mailto:techniek@sudwestfryslan.nl"	3600
CAA	0 issuewild ";"	3600

Checks

✓ TTLs within range #32

TTLs: A 1h, AAAA 1h, MX 1h, NS 1h.
✓ No CNAME at the apex #33

The zone apex has no CNAME record.
i

Wildcard record

A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.

#34
✓ CAA restricts issuance #35

Certificates may be issued by: letsencrypt.org, amazon.com, kpn.com, sectigo.com, none (issuance forbidden).