Domain report: studielink.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

anna.ns.cloudflare.com, dom.ns.cloudflare.com

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: anna.ns.cloudflare.com, dom.ns.cloudflare.com
NS in the zone: anna.ns.cloudflare.com, dom.ns.cloudflare.com

Nameserver	Addresses	Network (AS)	Glue
anna.ns.cloudflare.com	173.245.58.102 108.162.192.102 172.64.32.102 2803:f800:50::6ca2:c066 2a06:98c1:50::ac40:2066 2606:4700:50::adf5:3a66	AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US	-
dom.ns.cloudflare.com	172.64.33.157 173.245.59.157 108.162.193.157 2a06:98c1:50::ac40:219d 2606:4700:58::adf5:3b9d 2803:f800:50::6ca2:c19d	AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US	-

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: anna.ns.cloudflare.com, dom.ns.cloudflare.com.

#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 6 IPv4 /24s and 4 IPv6 /48s.
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 12 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 .com

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

12 of 12 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
anna.ns.cloudflare.com 173.245.58.102	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.2
anna.ns.cloudflare.com 108.162.192.102	NOERROR, 16 ms, authoritative	no	yes / yes	refused	2026.10.2
anna.ns.cloudflare.com 172.64.32.102	NOERROR, 16 ms, authoritative	no	yes / yes	refused	2026.10.2
anna.ns.cloudflare.com 2803:f800:50::6ca2:c066	NOERROR, 16 ms, authoritative	no	yes / yes	refused	2026.10.2
anna.ns.cloudflare.com 2a06:98c1:50::ac40:2066	NOERROR, 16 ms, authoritative	no	yes / yes	refused	2026.10.2
anna.ns.cloudflare.com 2606:4700:50::adf5:3a66	NOERROR, 16 ms, authoritative	no	yes / yes	refused	2026.10.2
dom.ns.cloudflare.com 172.64.33.157	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.2
dom.ns.cloudflare.com 173.245.59.157	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.2
dom.ns.cloudflare.com 108.162.193.157	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.2
dom.ns.cloudflare.com 2a06:98c1:50::ac40:219d	NOERROR, 16 ms, authoritative	no	yes / yes	refused	2026.10.2
dom.ns.cloudflare.com 2606:4700:58::adf5:3b9d	NOERROR, 17 ms, authoritative	no	yes / yes	refused	2026.10.2
dom.ns.cloudflare.com 2803:f800:50::6ca2:c19d	NOERROR, 15 ms, authoritative	no	yes / yes	refused	2026.10.2

Checks

✓ All respond #14

All 12 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: anna.ns.cloudflare.com: "2026.10.2"; dom.ns.cloudflare.com: "2026.10.2". 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 2417606465 · primary anna.ns.cloudflare.com

Found

Primary (MNAME): anna.ns.cloudflare.com
Contact (RNAME): dns.cloudflare.com
Serial: 2417606465
Refresh / retry: 10000 s / 2400 s
Expire: 604800 s
Negative TTL: 1800 s

Serial per nameserver

Nameserver	Serial
anna.ns.cloudflare.com (173.245.58.102)	2417606465
anna.ns.cloudflare.com (108.162.192.102)	2417606465
anna.ns.cloudflare.com (172.64.32.102)	2417606465
anna.ns.cloudflare.com (2803:f800:50::6ca2:c066)	2417606465
anna.ns.cloudflare.com (2a06:98c1:50::ac40:2066)	2417606465
anna.ns.cloudflare.com (2606:4700:50::adf5:3a66)	2417606465
dom.ns.cloudflare.com (172.64.33.157)	2417606465
dom.ns.cloudflare.com (173.245.59.157)	2417606465
dom.ns.cloudflare.com (108.162.193.157)	2417606465
dom.ns.cloudflare.com (2a06:98c1:50::ac40:219d)	2417606465
dom.ns.cloudflare.com (2606:4700:58::adf5:3b9d)	2417606465
dom.ns.cloudflare.com (2803:f800:50::6ca2:c19d)	2417606465

Checks

✓ Serial 2417606465 everywhere #22

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

SOA refresh 2h46m40s, retry 40m, expire 7d, negative TTL 30m.
✓ Primary is a public nameserver #24

The primary nameserver anna.ns.cloudflare.com is one of the listed nameservers.
✓ Contact dns@cloudflare.com #25

The SOA RNAME dns.cloudflare.com means dns@cloudflare.com.
✓ Timestamp serial #26

The serial 2417606465 is a Unix timestamp (2046-08-11 13:21 UTC).

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC
Signatures valid until: 23 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
2371	ECDSAP256SHA256 (13)	SHA256 F629750585CD6BF1…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
2371	KSK (257)	ECDSAP256SHA256 (13)
34505	ZSK (256)	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 2371 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Short-lived signatures (online signing) #30

Signatures are valid for 50h0m0s and created on demand; the current one was made at 2026-10-21 15:21 UTC and expires at 2026-10-23 17:21 UTC.
i

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

34 records at the apex

Found

Read from: 173.245.58.102:53

Type	Value	TTL
SOA	anna.ns.cloudflare.com. dns.cloudflare.com. 2417606465 10000 2400 604800 1800	1800
NS	anna.ns.cloudflare.com.	86400
NS	dom.ns.cloudflare.com.	86400
A	104.18.8.195	300
A	104.18.9.195	300
AAAA	2606:4700::6812:8c3	300
AAAA	2606:4700::6812:9c3	300
MX	0 studielink-nl.mail.protection.outlook.com.	3600
TXT	"7m85mb40hoarmn2p3fituhqfk8"	300
TXT	"HARICA-V3H1mMYjV4UMpplFAAC"	300
TXT	"MS=2A0AED1FFD0CE77B9FB39620F82CEB7941843DAA"	300
TXT	"QuoVadis=e2987c16-c5d1-453a-960d-500ca1af5089"	300
TXT	"_rfsh1u5syw7teyxdq0o8g1qcnaiztsq"	300
TXT	"ppkey-607b924c395b2a40355532b283074d6a"	300
TXT	"status-page-domain-verification=h0cnz9bfh6zp"	300
TXT	"v=spf1 ip4:46.183.254.40 ip6:2A01:8800:2:3::6 include:spf.afas.online include:stspg-customer.com include:spf.mailjet.com include:spf.protection.outlook.com include:_spf.plek.co include:_spf.afas.online -all"	300
CAA	0 iodef "mailto:security@studielink.nl"	300
CAA	0 issue "comodoca.com"	300
CAA	0 issue "digicert.com; cansignhttpexchanges=yes"	300
CAA	0 issue "harica.gr"	300
CAA	0 issue "letsencrypt.org"	300
CAA	0 issue "pki.goog; cansignhttpexchanges=yes"	300
CAA	0 issue "quovadisglobal.com"	300
CAA	0 issue "sectigo.com"	300
CAA	0 issue "ssl.com"	300
CAA	0 issuewild "comodoca.com"	300
CAA	0 issuewild "digicert.com; cansignhttpexchanges=yes"	300
CAA	0 issuewild "harica.gr"	300
CAA	0 issuewild "letsencrypt.org"	300
CAA	0 issuewild "pki.goog; cansignhttpexchanges=yes"	300
CAA	0 issuewild "quovadisglobal.com"	300
CAA	0 issuewild "sectigo.com"	300
CAA	0 issuewild "ssl.com"	300
CAA	0 issuewild "studielink.nl"	300

Checks

✓ TTLs within range #32

TTLs: A 5m, AAAA 5m, 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.
✓ CAA restricts issuance #35

Certificates may be issued by: comodoca.com, digicert.com, harica.gr, letsencrypt.org, pki.goog, quovadisglobal.com, sectigo.com, ssl.com, studielink.nl.