Domain report: mikrocentrum.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

ns1.anony.nl, ns2.anony.nl, ns3.anony.eu

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns1.anony.nl, ns2.anony.nl, ns3.anony.eu
NS in the zone: ns1.anony.nl, ns2.anony.nl, ns3.anony.eu

Nameserver	Addresses	Network (AS)	Glue
ns1.anony.nl	62.84.243.10 2a02:2968:2::10	AS48635 CLDIN-NL - Your Hosting B.V., NL AS48635 CLDIN-NL - Your Hosting B.V., NL	62.84.243.10 2a02:2968:2::10
ns2.anony.nl	185.27.140.33	AS48635 CLDIN-NL - Your Hosting B.V., NL	185.27.140.33
ns3.anony.eu	185.231.200.133	AS48635 CLDIN-NL - Your Hosting B.V., NL	-

Checks

✓ 3 nameservers #6

Delegated to ns1.anony.nl, ns2.anony.nl, ns3.anony.eu.
✓ 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 3 IPv4 /24s and 1 IPv6 /48.
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS48635 (CLDIN-NL - Your 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
✓ Nameserver names under 2 TLDs #12

Nameserver names use the TLDs .eu, .nl.
i

Partly IPv6

These nameservers have no IPv6 address: ns2.anony.nl, ns3.anony.eu.

#13

Nameservers

fail

4 of 4 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.anony.nl 62.84.243.10	NOERROR, 11 ms, authoritative	no	yes / yes	refused	Bind
ns1.anony.nl 2a02:2968:2::10	NOERROR, 11 ms, authoritative	no	yes / yes	refused	Bind
ns2.anony.nl 185.27.140.33	NOERROR, 11 ms, authoritative	no	yes / yes	refused	Bind
ns3.anony.eu 185.231.200.133	NOERROR, 10 ms, authoritative	no	no / yes	refused	Bind

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.anony.nl: "Bind"; ns2.anony.nl: "Bind"; ns3.anony.eu: "Bind".

#17
✓ Zone transfers refused #18

No nameserver allows a zone transfer to the public.
✗

No DNS over TCP

DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns3.anony.eu (185.231.200.133): dial tcp 185.231.200.133:53: connect: no route to host.

#19
✓ EDNS supported #20

All nameservers support EDNS(0).
✓ Public addresses #21

All nameserver addresses are publicly routable.

SOA

pass

serial 2100000921 · primary ns1.anony.nl

Found

Primary (MNAME): ns1.anony.nl
Contact (RNAME): hostmaster.mikrocentrum.nl
Serial: 2100000921
Refresh / retry: 14400 s / 3600 s
Expire: 604800 s
Negative TTL: 86400 s

Serial per nameserver

Nameserver	Serial
ns1.anony.nl (62.84.243.10)	2100000921
ns1.anony.nl (2a02:2968:2::10)	2100000921
ns2.anony.nl (185.27.140.33)	2100000921
ns3.anony.eu (185.231.200.133)	2100000921

Checks

✓ Serial 2100000921 everywhere #22

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

SOA refresh 4h, retry 1h, expire 7d, negative TTL 1d.
✓ Primary is a public nameserver #24

The primary nameserver ns1.anony.nl is one of the listed nameservers.
✓ Contact hostmaster@mikrocentrum.nl #25

The SOA RNAME hostmaster.mikrocentrum.nl means hostmaster@mikrocentrum.nl.
✓ Timestamp serial #26

The serial 2100000921 is a Unix timestamp (2036-07-18 13:35 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 1 iterations, 1-byte salt
Signatures valid until: 5 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
14629	RSASHA256 (8)	SHA256 BD647BD54753CD9F…	NO
2162	RSASHA256 (8)	SHA256 49CC1006FB6EBBC9…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
51744	ZSK (256)	RSASHA256 (8)
2162	KSK (257)	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 14629 (SHA256). That is normal during a key rollover; otherwise remove them.

#28
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Signatures valid until 2026-11-05 #30

The earliest DNSKEY/SOA signature expires at 2026-11-05 00:00 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 1 iteration 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

info

10 records at the apex

Found

Read from: 62.84.243.10:53

Type	Value	TTL
SOA	ns1.anony.nl. hostmaster.mikrocentrum.nl. 2100000921 14400 3600 604800 86400	300
NS	ns3.anony.eu.	86400
NS	ns1.anony.nl.	86400
NS	ns2.anony.nl.	86400
A	94.237.40.201	3600
MX	20 de-smtp-inbound-2.mimecast.com.	3600
MX	10 de-smtp-inbound-1.mimecast.com.	3600
TXT	"v=spf1 mx a ip4:185.56.144.63 ip4:159.183.2.58 ip4:62.84.245.31 ip6:2a02:2968::1c00:bbff:fe00:dbb ip4:188.122.90.209/28 ip4:81.82.239.242 ip4:195.130.132.32/27 ip4:195.130.137.64/27 include:spf.afas.online include:spf.twistedbytes.eu include:sendgrid.net " "include:de._netblocks.mimecast.com ~all"	3600
TXT	"MS=ms94272213"	3600
TXT	"0ed1fe018ae5981d82968d4e2abaf8092314758559"	3600

Checks

✓ TTLs within range #32

TTLs: A 1h, MX 1h, 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