Domain report: zeelandnet.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

ns1.dfn.nl, ns2.dfn.nl

Found

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

Nameserver	Addresses	Network (AS)	Glue
ns1.dfn.nl	212.115.192.111 2a02:f68:0:cf4::111	AS15435 KABELFOON - DELTA Fiber Nederland B.V., NL AS15435 KABELFOON - DELTA Fiber Nederland B.V., NL	212.115.192.111 2a02:f68:0:cf4::111
ns2.dfn.nl	62.45.45.111 2001:4c3a:100:b::111	AS15435 KABELFOON - DELTA Fiber Nederland B.V., NL AS15435 KABELFOON - DELTA Fiber Nederland B.V., NL	62.45.45.111 2001:4c3a:100:b::111

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.dfn.nl, ns2.dfn.nl.

#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 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 (AS15435 (KABELFOON - DELTA Fiber Nederland 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 .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

info

4 of 4 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.dfn.nl 212.115.192.111	NOERROR, 20 ms, authoritative	no	yes / yes	refused	BertjeDNS
ns1.dfn.nl 2a02:f68:0:cf4::111	NOERROR, 25 ms, authoritative	no	yes / yes	refused	BertjeDNS
ns2.dfn.nl 62.45.45.111	NOERROR, 23 ms, authoritative	no	yes / yes	refused	BertjeDNS
ns2.dfn.nl 2001:4c3a:100:b::111	NOERROR, 18 ms, authoritative	no	yes / yes	refused	BertjeDNS

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.
i

Identifying string disclosed

These nameservers answer version queries with a string that is not a version number: ns1.dfn.nl: "BertjeDNS"; ns2.dfn.nl: "BertjeDNS".

#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 2026101707 · primary ns1.dfn.nl

Found

Primary (MNAME): ns1.dfn.nl
Contact (RNAME): hostmaster.dfn.nl
Serial: 2026101707
Refresh / retry: 10800 s / 3600 s
Expire: 604800 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
ns1.dfn.nl (212.115.192.111)	2026101707
ns1.dfn.nl (2a02:f68:0:cf4::111)	2026101707
ns2.dfn.nl (62.45.45.111)	2026101707
ns2.dfn.nl (2001:4c3a:100:b::111)	2026101707

Checks

✓ Serial 2026101707 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 ns1.dfn.nl is one of the listed nameservers.
✓ Contact hostmaster@dfn.nl #25

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

The serial 2026101707 follows the YYYYMMDDnn convention (2026-10-17).

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver: yes
NSEC3: 0 iterations, 0-byte salt
Signatures valid until: 29 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
10481	ECDSAP256SHA256 (13)	SHA256 E6683D7BC050502A…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
10481	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 10481 (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.

Records

info

15 records at the apex

Found

Read from: 212.115.192.111:53

Type	Value	TTL
SOA	ns1.dfn.nl. hostmaster.dfn.nl. 2026101707 10800 3600 604800 3600	86400
NS	ns1.dfn.nl.	86400
NS	ns2.dfn.nl.	86400
A	104.18.4.31	300
A	104.18.5.31	300
AAAA	2606:4700::6812:51f	300
AAAA	2606:4700::6812:41f	300
MX	10 mx1.zeelandnet.nl.	86400
MX	30 mx3.zeelandnet.nl.	86400
MX	20 mx2.zeelandnet.nl.	86400
MX	40 mx4.zeelandnet.nl.	86400
TXT	"ca3-b71bf206d4024dafa404b9873df27de4"	86400
TXT	"google-site-verification=XKfRPPyGXjVIP--rJAqq8oGTQXODnr_orP_uMwjl6B8"	86400
TXT	"v=spf1 include:_spf.dfn.nl include:_spf.megamail.nl -all"	86400
TXT	"ca3-6f32711c50e44f8db11a3dfc690c0e58"	86400

Checks

✓ TTLs within range #32

TTLs: A 5m, AAAA 5m, MX 1d, NS 1d. The NS TTL at the parent is 1h and in the zone 1d; 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