Domain report: utwente.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

ns1.utwente.nl, ns2.utwente.nl, ns3.utwente.nl

Found

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

Nameserver	Addresses	Network (AS)	Glue
ns1.utwente.nl	130.89.1.2 2001:67c:2564:a102::3:1	AS1133 UTWENTE-AS - SURF B.V., NL AS1133 UTWENTE-AS - SURF B.V., NL	130.89.1.2 2001:67c:2564:a102::3:1
ns2.utwente.nl	130.89.1.3 2001:67c:2564:a102::3:2	AS1133 UTWENTE-AS - SURF B.V., NL AS1133 UTWENTE-AS - SURF B.V., NL	130.89.1.3 2001:67c:2564:a102::3:2
ns3.utwente.nl	131.155.0.37	AS1161 AS-TUE - SURF B.V., NL	131.155.0.37

Checks

✓ 3 nameservers #6

Delegated to ns1.utwente.nl, ns2.utwente.nl, ns3.utwente.nl.
✓ 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.utwente.nl, ns2.utwente.nl, ns3.utwente.nl.
✓ All names resolve #9

Every nameserver name has an address and is not an alias.
i

One address family in one network

all IPv6 addresses are in 2001:67c:2564::/48, while the other address family is spread over several networks.

#10
✓ 2 autonomous systems #11

The nameservers are spread over: AS1133 (UTWENTE-AS - SURF B.V., NL): 4 addresses; AS1161 (AS-TUE - SURF B.V., NL): 1 address.
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: ns3.utwente.nl.

#13

Nameservers

pass

5 of 5 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.utwente.nl 130.89.1.2	NOERROR, 13 ms, authoritative	no	yes / yes	refused	-
ns1.utwente.nl 2001:67c:2564:a102::3:1	NOERROR, 12 ms, authoritative	no	yes / yes	refused	-
ns2.utwente.nl 130.89.1.3	NOERROR, 13 ms, authoritative	no	yes / yes	refused	-
ns2.utwente.nl 2001:67c:2564:a102::3:2	NOERROR, 12 ms, authoritative	no	yes / yes	refused	-
ns3.utwente.nl 131.155.0.37	NOERROR, 12 ms, authoritative	no	yes / yes	refused	-

Checks

✓ All respond #14

All 5 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.
✓ No version disclosed #17

The nameservers don't reveal their software version.
✓ 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 2181022943 · primary ns1.utwente.nl

Found

Primary (MNAME): ns1.utwente.nl
Contact (RNAME): dnsmaster.utwente.nl
Serial: 2181022943
Refresh / retry: 28800 s / 7200 s
Expire: 604800 s
Negative TTL: 1200 s

Serial per nameserver

Nameserver	Serial
ns1.utwente.nl (130.89.1.2)	2181022943
ns1.utwente.nl (2001:67c:2564:a102::3:1)	2181022943
ns2.utwente.nl (130.89.1.3)	2181022943
ns2.utwente.nl (2001:67c:2564:a102::3:2)	2181022943
ns3.utwente.nl (131.155.0.37)	2181022943

Checks

✓ Serial 2181022943 everywhere #22

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

SOA refresh 8h, retry 2h, expire 7d, negative TTL 20m.
✓ Primary is a public nameserver #24

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

The SOA RNAME dnsmaster.utwente.nl means dnsmaster@utwente.nl.
✓ Timestamp serial #26

The serial 2181022943 is a Unix timestamp (2039-02-11 07:42 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 16-byte salt
Signatures valid until: 17 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
17944	RSASHA256 (8)	SHA256 71EB8E95E40378E1…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
17944	KSK (257)	RSASHA256 (8)
46341	ZSK (256)	RSASHA256 (8)
12285	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 17944 (SHA256).
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Signatures valid until 2026-11-17 #30

The earliest DNSKEY/SOA signature expires at 2026-11-17 22:58 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations and a 16-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

23 records at the apex

Found

Read from: 130.89.1.2:53

Type	Value	TTL
SOA	ns1.utwente.nl. dnsmaster.utwente.nl. 2181022943 28800 7200 604800 1200	3600
NS	ns1.utwente.nl.	3600
NS	ns3.utwente.nl.	3600
NS	ns2.utwente.nl.	3600
A	130.89.12.12	300
AAAA	2001:67c:2564:a429::1:3	300
MX	10 utwente-nl.mail.protection.outlook.com.	900
TXT	"apple-domain-verification=9EPP8F0catSA9f0O"	3600
TXT	"anthropic-domain-verification-9kcwbj=PZwKFnqFonm94a99f5AWzhFzb"	3600
TXT	"zoom=7028454"	3600
TXT	"Wr3KIzpc3tUeVW9RvqJ5QjywoV0ZwD3Qi+Mxxat1658ZHjDm0xm4otFa2NkqKPivylclLFa6GH+CdxXJ3SJbaA=="	3600
TXT	"v=spf1 mx a:smtppool.utwente.nl ip4:52.17.45.98 ip4:52.16.190.81 ip4:54.229.2.165 ip4:52.30.130.201 ip4:34.252.12.130 ip4:52.30.8.165 a:edgepool.ad.utwente.nl include:spf.protection.outlook.com ip4:159.183.231.20 -all"	3600
TXT	"google-site-verification=PgdRqkGsaQx528wE-tmmMPjyDyDr1-0Vh6cqnNcodCs"	3600
TXT	"HARICA-LRlkzTJPU8QTqOv9PCd"	3600
TXT	"1JOvDu30lTiTvWtC3iF9D8zs+IKjCWUq6i6LFch8630FBRBvpcS5e90hIXNNoDIqPiyVvmjiwIbHDorIDlts1Q=="	3600
TXT	"jamf-site-verification=MLXEZVYv2Br3Ijb9khXZUg"	3600
TXT	"MS=ms81740447"	3600
TXT	"jetbrains-domain-verification=dhhwkvidedf2d3pw0fh8su5n4"	3600
TXT	"atlassian-domain-verification=xp1mabSduKWq9tjJUyknw1zcvZPybL5NINb3aVBWFOLsPjqRXHBxu1C/OYO5pZws"	3600
CAA	0 issuemail "harica.gr"	3600
CAA	0 issue "harica.gr"	3600
CAA	0 iodef "mailto:scs-ra@utwente.nl"	3600
CAA	0 issue "letsencrypt.org"	3600

Checks

✓ TTLs within range #32

TTLs: A 5m, AAAA 5m, MX 15m, NS 1h.
✓ 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.