Domain report: mcl.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

dmz-dns01.znb.nl, dmz-dns02.znb.nl, ns2.surfnet.nl

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: dmz-dns01.znb.nl, dmz-dns02.znb.nl, ns2.surfnet.nl
NS in the zone: dmz-dns01.znb.nl, dmz-dns02.znb.nl, ns2.surfnet.nl

Nameserver	Addresses	Network (AS)	Glue
dmz-dns01.znb.nl	145.127.128.82	AS1147 MCL-AS - SURF B.V., NL	145.127.128.82
dmz-dns02.znb.nl	145.127.128.83	AS1147 MCL-AS - SURF B.V., NL	145.127.128.83
ns2.surfnet.nl	192.87.36.2 2001:610:3:200a:192:87:36:2	AS1103 SURFNET-NL - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL	192.87.36.2 2001:610:3:200a:192:87:36:2

Checks

✓ 3 nameservers #6

Delegated to dmz-dns01.znb.nl, dmz-dns02.znb.nl, ns2.surfnet.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 1 IPv6 /48.
✓ 2 autonomous systems #11

The nameservers are spread over: AS1103 (SURFNET-NL - SURF B.V., NL): 2 addresses; AS1147 (MCL-AS - SURF 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
i

Partly IPv6

These nameservers have no IPv6 address: dmz-dns01.znb.nl, dmz-dns02.znb.nl.

#13

Nameservers

info

4 of 4 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
dmz-dns01.znb.nl 145.127.128.82	NOERROR, 15 ms, authoritative	no	yes / yes	refused	-
dmz-dns02.znb.nl 145.127.128.83	NOERROR, 14 ms, authoritative	no	yes / yes	refused	-
ns2.surfnet.nl 192.87.36.2	NOERROR, 12 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns2.surfnet.nl 2001:610:3:200a:192:87:36:2	NOERROR, 12 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl

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: ns2.surfnet.nl: "This is a SURFnet nameserver - dns-beheer@surfnet.nl".

#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

warn

serial 63549 · primary dmz-dns01.znb.nl

Found

Primary (MNAME): dmz-dns01.znb.nl
Contact (RNAME): postmaster.mcl.nl
Serial: 63549
Refresh / retry: 300 s / 30 s
Expire: 86400 s
Negative TTL: 900 s

Serial per nameserver

Nameserver	Serial
dmz-dns01.znb.nl (145.127.128.82)	63549
dmz-dns02.znb.nl (145.127.128.83)	63549
ns2.surfnet.nl (192.87.36.2)	63549
ns2.surfnet.nl (2001:610:3:200a:192:87:36:2)	63549

Checks

✓ Serial 63549 everywhere #22

All nameservers serve the same version of the zone.
!

Unusual SOA timers

refresh 5m is outside 20m–1d; expire 1d is shorter than 7d; secondaries stop answering too soon when the primary is down. Current values: refresh 5m, retry 30s, expire 1d, negative TTL 15m.

#23
✓ Primary is a public nameserver #24

The primary nameserver dmz-dns01.znb.nl is one of the listed nameservers.
✓ Contact postmaster@mcl.nl #25

The SOA RNAME postmaster.mcl.nl means postmaster@mcl.nl.
✓ Counter serial #26

The serial 63549 is a plain counter.

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 1-byte salt
Signatures valid until: 25 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
22496	RSASHA256 (8)	SHA256 0F58E7D93BE7270B…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
22496	KSK (257)	RSASHA256 (8)
52321	ZSK (256)	RSASHA256 (8)
63984	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.
✓ DS matches a key #28

The DS record at the parent matches a key in the zone: key tag 22496 (SHA256).
✓ 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 15:24 UTC and expires at 2026-10-25 15:33 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations 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

pass

19 records at the apex

Found

Read from: 145.127.128.82:53

Type	Value	TTL
SOA	dmz-dns01.znb.nl. postmaster.mcl.nl. 63549 300 30 86400 900	300
NS	dmz-dns01.znb.nl.	300
NS	dmz-dns02.znb.nl.	300
NS	ns2.surfnet.nl.	300
A	136.144.176.218	300
AAAA	2a01:7c8:aac9:581::1	300
MX	100 mcl-nl.mail.protection.outlook.com.	300
TXT	"sendinblue-code:ccf69660a9b76eb6a8c158f3f0f767d2"	300
TXT	"HARICA-1Y1DFclhpyXtgZlnLqy"	300
TXT	"DomainVerification=8BKOCH4UK2EFR58E0LN7S1KIHNH53SBYIFAZO7PMPELJNBERB0W4OP9WE3ZEQ7HL"	300
TXT	"HARICA-AJ3xMzv6uKZ86SscMze"	300
TXT	"pexip-portal-domain-verification=d0ede3d0-67a3-4b06-925c-99809972d998"	300
TXT	"pexip-portal-domain-verification=b84863ba-67a7-4670-8908-3c57e43a8ec9"	300
TXT	"v=spf1 include:_spf.zorgmail.nl include:spf.sendinblue.com include:spf.protection.outlook.com include:_spf.hosting.kirra.nl " " ip4:136.144.176.218 ip4:83.136.192.22 ip4:31.186.167.154 ip4:83.136.192.4 ip4:31.186.167.153 ip4:217.63.76.126 ip4:145.127.130.51 ip4:145.127.130.52 " " ip4:145.98.0.98 ip4:145.98.0.99 -all"	300
TXT	"apple-domain-verification=1waKCWIurClnWRQu"	300
TXT	"MS=ms76024790"	300
CAA	128 issue "harica.gr"	300
CAA	128 issue "letsencrypt.org"	300
CAA	128 issue "sectigo.com"	300

Checks

✓ TTLs within range #32

TTLs: A 5m, AAAA 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: harica.gr, letsencrypt.org, sectigo.com.