Domain report: midden-groningen.nl

Registration

info

.nl country-code

Found

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

Lookup error: https://rdap.sidn.nl/domain/midden-groningen.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/midden-groningen.nl returned HTTP 429

#3

Delegation

info

ns3.cj2.nl, ns4.cj2.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns3.cj2.nl, ns4.cj2.nl
NS in the zone: ns3.cj2.nl, ns4.cj2.nl

Nameserver	Addresses	Network (AS)	Glue
ns3.cj2.nl	194.50.163.37 2a00:1bd0::100:110	AS39704 CJ2-AS - CJ2 Hosting B.V., NL AS39704 CJ2-AS - CJ2 Hosting B.V., NL	-
ns4.cj2.nl	91.192.36.44 2a00:1bd0:0:104::110	AS39704 CJ2-AS - CJ2 Hosting B.V., NL AS39704 CJ2-AS - CJ2 Hosting B.V., NL	-

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns3.cj2.nl, ns4.cj2.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.
i

One address family in one network

all IPv6 addresses are in 2a00:1bd0::/48, while the other address family is spread over several networks.

#10
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS39704 (CJ2-AS - CJ2 Hosting 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

warn

4 of 4 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns3.cj2.nl 194.50.163.37	NOERROR, 13 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.1.1
ns3.cj2.nl 2a00:1bd0::100:110	NOERROR, 14 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.1.1
ns4.cj2.nl 91.192.36.44	NOERROR, 15 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.1.1
ns4.cj2.nl 2a00:1bd0:0:104::110	NOERROR, 14 ms, authoritative	no	yes / yes	refused	PowerDNS Authoritative Server 4.1.1

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: ns3.cj2.nl: "PowerDNS Authoritative Server 4.1.1"; ns4.cj2.nl: "PowerDNS Authoritative Server 4.1.1". 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 ns3.cj2.nl

Found

Primary (MNAME): ns3.cj2.nl
Contact (RNAME): noc.cj2.nl
Serial: 2026102201
Refresh / retry: 28800 s / 14400 s
Expire: 1209600 s
Negative TTL: 86400 s

Serial per nameserver

Nameserver	Serial
ns3.cj2.nl (194.50.163.37)	2026102201
ns3.cj2.nl (2a00:1bd0::100:110)	2026102201
ns4.cj2.nl (91.192.36.44)	2026102201
ns4.cj2.nl (2a00:1bd0:0:104::110)	2026102201

Checks

✓ Serial 2026102201 everywhere #22

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

SOA refresh 8h, retry 4h, expire 14d, negative TTL 1d.
✓ Primary is a public nameserver #24

The primary nameserver ns3.cj2.nl is one of the listed nameservers.
✓ Contact noc@cj2.nl #25

The SOA RNAME noc.cj2.nl means noc@cj2.nl.
✓ Date-based serial #26

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

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC
Signatures valid until: 5 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
59657	ECDSAP256SHA256 (13)	SHA256 A8287842643C92DC…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
59657	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 59657 (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.
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NSEC

The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.

#31

Records

pass

15 records at the apex

Found

Read from: 194.50.163.37:53

Type	Value	TTL
SOA	ns3.cj2.nl. noc.cj2.nl. 2026102201 28800 14400 1209600 86400	14400
NS	ns4.cj2.nl.	1800
NS	ns3.cj2.nl.	1800
A	185.135.12.48	3600
AAAA	2a06:efc0:3::48:0	14400
MX	10 middengroningen-nl01e.t-v1.mx.microsoft.	3600
TXT	"v=spf1 include:_spf.zivver.com include:spf1.midden-groningen.nl include:spf.protection.outlook.com include:_spf.cursad.nl include:spf.topdesk.net include:spf.iburgerzaken.nl include:spf.flexmail.eu a:malengo.exception.mx include:spf.flowmailer.net -all"	3600
TXT	"google-site-verification=jRvRr_asawBrdE-dCLMkpcbvx_NSpyYN8K9FpmETu1M"	3600
TXT	"openai-domain-verification=dv-pADWUHYnKUylqYyDLgb0hQmS"	3600
TXT	"DomainVerification=ZZMYMZQEMLTZ900RGQZH4Z8YROV05HNID2YA95PVXQLGAU0A5MCMSUIT8IIPSL99"	3600
TXT	"iD0gdoJY/HAEE0kXDxpcltfum8WRk47b+67+DEf1nPVR8qUQIUwJt7Ku3dZJC7BRMKr6gy1iHI/UsGRyrBOmDg=="	3600
TXT	"7DonywVhrARaANWvUwXY8ogaLKNXEpXmM2zPproktr5gR6Sj29Ri7jHSncldWTEf"	3600
CAA	0 issue "certsign.ro"	3600
CAA	0 issue "sectigo.com"	3600
CAA	0 issue "letsencrypt.org"	3600

Checks

✓ TTLs within range #32

TTLs: A 1h, AAAA 4h, MX 1h, NS 30m. The NS TTL at the parent is 1h and in the zone 30m; 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: certsign.ro, sectigo.com, letsencrypt.org.