Domain report: inholland.nl

Registration

info

.nl country-code · SURF B.V.

Found

TLD: .nl (country-code)
ICANN policies apply: no
Registrar: SURF B.V.
Registered: 7 December 1999
Last changed: 10 February 2026
Status: active
Registry nameservers: ns1.inholland.nl, ns2.surfnet.nl
RDAP server: https://rdap.sidn.nl/

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

Expiry date not published

The registry does not publish the expiry date in RDAP. Check it with your registrar.

#3
i

No transfer lock

The domain has no transfer lock (status: active). A registrar lock protects against unauthorized transfers.

#4
✓ Registry and delegation match #5

The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns1.inholland.nl, ns2.surfnet.nl

Found

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

Nameserver	Addresses	Network (AS)	Glue
ns1.inholland.nl	194.171.35.11 2001:610:170:200::11	AS1103 SURFNET-NL - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL	194.171.35.11 2001:610:170:200::11
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

i

2 nameservers

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

#6
✓ Parent and zone agree #7

The parent delegation and the zone's NS records list the same nameservers.
✓ Glue present and correct #8

Glue is published for the nameservers inside the zone: ns1.inholland.nl.
✓ 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 (AS1103 (SURFNET-NL - SURF 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.inholland.nl 194.171.35.11	NOERROR, 13 ms, authoritative	no	yes / yes	refused	-
ns1.inholland.nl 2001:610:170:200::11	NOERROR, 13 ms, authoritative	no	yes / yes	refused	-
ns2.surfnet.nl 192.87.36.2	NOERROR, 11 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

pass

serial 2012124472 · primary ns1.inholland.nl

Found

Primary (MNAME): ns1.inholland.nl
Contact (RNAME): postmaster.inholland.nl
Serial: 2012124472
Refresh / retry: 10800 s / 1080 s
Expire: 2419200 s
Negative TTL: 900 s

Serial per nameserver

Nameserver	Serial
ns1.inholland.nl (194.171.35.11)	2012124472
ns1.inholland.nl (2001:610:170:200::11)	2012124472
ns2.surfnet.nl (192.87.36.2)	2012124472
ns2.surfnet.nl (2001:610:3:200a:192:87:36:2)	2012124472

Checks

✓ Serial 2012124472 everywhere #22

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

SOA refresh 3h, retry 18m, expire 28d, negative TTL 15m.
✓ Primary is a public nameserver #24

The primary nameserver ns1.inholland.nl is one of the listed nameservers.
✓ Contact postmaster@inholland.nl #25

The SOA RNAME postmaster.inholland.nl means postmaster@inholland.nl.
✓ Timestamp serial #26

The serial 2012124472 is a Unix timestamp (2033-10-05 11:27 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 2-byte salt
Signatures valid until: 25 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
55381	RSASHA256 (8)	SHA256 F4A405F46DBCA27D…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
55381	KSK (257)	RSASHA256 (8)
54853	ZSK (256)	RSASHA256 (8)
30454	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 55381 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Short-lived signatures (online signing) #30

Signatures are valid for 97h0m0s and created on demand; the current one was made at 2026-10-21 07:44 UTC and expires at 2026-10-25 08:25 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations and a 2-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: 194.171.35.11:53

Type	Value	TTL
SOA	ns1.inholland.nl. postmaster.inholland.nl. 2012124472 10800 1080 2419200 900	7200
NS	ns2.surfnet.nl.	7200
NS	ns1.inholland.nl.	7200
A	52.166.190.114	7200
MX	10 inholland-nl.i-v1.mx.microsoft.	3600
TXT	"apple-domain-verification=MUvO6CCMsFBIo282"	7200
TXT	"v=spf1 include:spf.protection.outlook.com ip4:13.74.56.125 ip4:13.79.21.104 ip4:13.88.226.191 ip4:13.94.232.90 " "ip4:135.84.216.0/22 ip4:141.193.32.0/23 ip4:143.55.224.0/21 ip4:143.55.232.0/22 ip4:143.55.236.0/22 ip4:147.253.222.19 " "ip4:148.105.0.0/16 ip4:149.210.188.12 ip4:153.92.224.0/19 ip4:159.112.240.0/20 ip4:159.135.132.128/25 ip4:159.135.140.80/29 " "ip4:159.135.224.0/20 ip4:161.38.192.0/20 ip4:161.38.204.0/22 ip4:168.245.121.45 ip4:168.245.24.19 include:spf1.inholland.nl -all"	7200
TXT	"ff7914fde7154a62aabbb3e436807f8f"	7200
TXT	"9L09gHOMJngsu3YjMO7DssE3K1G5h3B9Y3U0pD8ii9tW2+3o9UWjwZ5+/Fx9S6rw9hfPgrGZPwiJ8P1IpvpKaw=="	7200
TXT	"sendinblue-code:87d3b6531822c9f548f0223418f9c5d7"	7200
TXT	"d365mktkey=whgyFgvs8UYCZkhc1bCqPakC2uKhPxgjFepxJGul6Xox"	7200
TXT	"apple-domain-verification=D4EeOAclMgPfnNCN"	7200
TXT	"HARICA-C5FEBwiZuVUXlA3Bgzn"	7200
TXT	"HARICA-9zTpXprvhSGzs9EGHtw"	7200
TXT	"v=NTA7516-1;startdate=2025-09;enddate=2030-09;provider=smartlockr;ntamx=10 ntamx.smartlockr.eu"	7200
TXT	"MS=ms69077215"	7200
TXT	"spf2.0/pra ?all"	7200
CAA	0 issue "harica.gr"	7200
CAA	0 issue "sectigo.com"	7200

Checks

✓ TTLs within range #32

TTLs: A 2h, MX 1h, NS 2h. The NS TTL at the parent is 1h and in the zone 2h; 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, sectigo.com.