Domain report: maastrichtuniversity.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

ns1.maastrichtuniversity.nl, ns1.surfnet.nl, ns1.zurich.surf.net, ns2.maastrichtuniversity.eu

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: ns1.maastrichtuniversity.nl, ns1.surfnet.nl, ns1.zurich.surf.net, ns2.maastrichtuniversity.eu
NS in the zone: ns1.maastrichtuniversity.nl, ns1.surfnet.nl, ns1.zurich.surf.net, ns2.maastrichtuniversity.eu

Nameserver	Addresses	Network (AS)	Glue
ns1.maastrichtuniversity.nl	137.120.24.50	AS1103 SURFNET-NL - SURF B.V., NL	137.120.24.50
ns1.surfnet.nl	192.87.106.101 2001:610:1:800a:192:87:106:101	AS1103 SURFNET-NL - SURF B.V., NL AS1103 SURFNET-NL - SURF B.V., NL	192.87.106.101 2001:610:1:800a:192:87:106:101
ns1.zurich.surf.net	195.176.255.9 2001:620:0:9::1103	AS559 Switch - SWITCH, CH AS559 Switch - SWITCH, CH	-
ns2.maastrichtuniversity.eu	137.120.24.51	AS1103 SURFNET-NL - SURF B.V., NL	-

Checks

✓ 4 nameservers #6

Delegated to ns1.maastrichtuniversity.nl, ns1.surfnet.nl, ns1.zurich.surf.net, ns2.maastrichtuniversity.eu.
✓ 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.maastrichtuniversity.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 3 IPv4 /24s and 2 IPv6 /48s.
✓ 2 autonomous systems #11

The nameservers are spread over: AS1103 (SURFNET-NL - SURF B.V., NL): 4 addresses; AS559 (Switch - SWITCH, CH): 2 addresses.
✓ Nameserver names under 3 TLDs #12

Nameserver names use the TLDs .eu, .net, .nl.
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Partly IPv6

These nameservers have no IPv6 address: ns1.maastrichtuniversity.nl, ns2.maastrichtuniversity.eu.

#13

Nameservers

info

6 of 6 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.maastrichtuniversity.nl 137.120.24.50	NOERROR, 15 ms, authoritative	no	yes / yes	refused	-
ns1.surfnet.nl 192.87.106.101	NOERROR, 9 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns1.surfnet.nl 2001:610:1:800a:192:87:106:101	NOERROR, 9 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surfnet.nl
ns1.zurich.surf.net 195.176.255.9	NOERROR, 9 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surf.nl
ns1.zurich.surf.net 2001:620:0:9::1103	NOERROR, 9 ms, authoritative	no	yes / yes	refused	This is a SURFnet nameserver - dns-beheer@surf.nl
ns2.maastrichtuniversity.eu 137.120.24.51	NOERROR, 15 ms, authoritative	no	yes / yes	refused	-

Checks

✓ All respond #14

All 6 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.surfnet.nl: "This is a SURFnet nameserver - dns-beheer@surfnet.nl"; ns1.zurich.surf.net: "This is a SURFnet nameserver - dns-beheer@surf.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

info

serial 2016219315 · primary gm.maastrichtuniversity.nl

Found

Primary (MNAME): gm.maastrichtuniversity.nl
Contact (RNAME): postmaster.unimaas.nl
Serial: 2016219315
Refresh / retry: 10800 s / 1080 s
Expire: 2419200 s
Negative TTL: 900 s

Serial per nameserver

Nameserver	Serial
ns1.maastrichtuniversity.nl (137.120.24.50)	2016219315
ns1.surfnet.nl (192.87.106.101)	2016219315
ns1.surfnet.nl (2001:610:1:800a:192:87:106:101)	2016219315
ns1.zurich.surf.net (195.176.255.9)	2016219315
ns1.zurich.surf.net (2001:620:0:9::1103)	2016219315
ns2.maastrichtuniversity.eu (137.120.24.51)	2016219315

Checks

✓ Serial 2016219315 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.
i

Hidden master

The primary nameserver gm.maastrichtuniversity.nl is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.

#24
✓ Contact postmaster@unimaas.nl #25

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

The serial 2016219315 is a Unix timestamp (2033-11-21 20:55 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 7-byte salt
Signatures valid until: 25 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
62264	ECDSAP256SHA256 (13)	SHA256 10BE2FDA3D001C4C…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
52970	ZSK (256)	ECDSAP256SHA256 (13)
62264	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 62264 (SHA256).
✓ Modern algorithms #29

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

Signatures are valid for 97h0m0s and created on demand; the current one was made at 2026-10-21 13:59 UTC and expires at 2026-10-25 14:54 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations and a 7-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

15 records at the apex

Found

Read from: 137.120.24.50:53

Type	Value	TTL
SOA	gm.maastrichtuniversity.nl. postmaster.unimaas.nl. 2016219315 10800 1080 2419200 900	28800
NS	ns2.maastrichtuniversity.eu.	28800
NS	ns1.surfnet.nl.	28800
NS	ns1.zurich.surf.net.	28800
NS	ns1.maastrichtuniversity.nl.	28800
A	137.120.6.130	300
AAAA	2001:610:190:900::6:130	28800
MX	0 maastrichtuniversity-nl.x-v1.mx.microsoft.	300
TXT	"HARICA-uLI46ELqYckOmGNbUNg"	300
TXT	"HARICA-t8EcerSPQcJzCF1PYA9"	300
TXT	"v=spf1 ip4:94.143.211.206 ip4:94.143.211.207 ip4:94.143.211.204 ip4:172.246.33.15 ip4:137.120.1.21/32 include:sendgrid.net include:_spf.qemailserver.com ip6:2001:617:0:7:145:98:66:42" " include:amazonses.com include:spf.datab.nl include:spf.protection.outlook.com ip4:213.206.238.195 ip4:213.206.238.185 ip4:192.87.143.6 ip4:46.31.48.0/21 ip4:37.46.141.132 ip4:185.181.140.147 ip4:137.120.3.192/27 ip4:145.98.66.42 -all"	300
TXT	"atlassian-domain-verification=eGOmtmgFqh1AKXMWCliJIqH3rjBWR5RnuvDsSWzwBMjAFvBvh0laZleqWbpIJ8QP"	300
TXT	"google-site-verification=RY0nrQRG6UikqYIPBSwkCMUriDhjjTLOxwGpKJQOU0w"	300
TXT	"google-site-verification=H9GnmIF5uizk8iQWg20iqGbqAUUryvPKxhs5Xo9JxJc"	300
TXT	"brevo-code:1607a47a88dbc07d97d6554de5efceed"	300

Checks

✓ TTLs within range #32

TTLs: A 5m, AAAA 8h, MX 5m, NS 8h. The NS TTL at the parent is 1h and in the zone 8h; resolvers may use either.
✓ No CNAME at the apex #33

The zone apex has no CNAME record.
i

Wildcard record

A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.

#34
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