Domain report: uu.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

australie.net.uu.nl, azie.net.uu.nl, ns1.surfnet.nl, ns1.zurich.surf.net

Found

Parent zone: nl
Delegation from: ns1.dns.nl (194.0.28.53)
NS at the parent: australie.net.uu.nl, azie.net.uu.nl, ns1.surfnet.nl, ns1.zurich.surf.net
NS in the zone: australie.net.uu.nl, azie.net.uu.nl, ns1.surfnet.nl, ns1.zurich.surf.net

Nameserver	Addresses	Network (AS)	Glue
australie.net.uu.nl	131.211.4.25	AS1103 SURFNET-NL - SURF B.V., NL	131.211.4.25
azie.net.uu.nl	131.211.4.8	AS1103 SURFNET-NL - SURF B.V., NL	131.211.4.8
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	-

Checks

✓ 4 nameservers #6

Delegated to australie.net.uu.nl, azie.net.uu.nl, ns1.surfnet.nl, ns1.zurich.surf.net.
✓ 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: australie.net.uu.nl, azie.net.uu.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 2 TLDs #12

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

Partly IPv6

These nameservers have no IPv6 address: australie.net.uu.nl, azie.net.uu.nl.

#13

Nameservers

info

6 of 6 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
australie.net.uu.nl 131.211.4.25	NOERROR, 12 ms, authoritative	no	yes / yes	refused	-
azie.net.uu.nl 131.211.4.8	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-
ns1.surfnet.nl 192.87.106.101	NOERROR, 10 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

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 2014771343 · primary dns.uu.nl

Found

Primary (MNAME): dns.uu.nl
Contact (RNAME): hostmaster.uu.nl
Serial: 2014771343
Refresh / retry: 3600 s / 600 s
Expire: 1209600 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
australie.net.uu.nl (131.211.4.25)	2014771343
azie.net.uu.nl (131.211.4.8)	2014771343
ns1.surfnet.nl (192.87.106.101)	2014771343
ns1.surfnet.nl (2001:610:1:800a:192:87:106:101)	2014771343
ns1.zurich.surf.net (195.176.255.9)	2014771343
ns1.zurich.surf.net (2001:620:0:9::1103)	2014771343

Checks

✓ Serial 2014771343 everywhere #22

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

SOA refresh 1h, retry 10m, expire 14d, negative TTL 1h.
i

Hidden master

The primary nameserver dns.uu.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 hostmaster@uu.nl #25

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

The serial 2014771343 is a Unix timestamp (2033-11-05 02:42 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 0 iterations, 16-byte salt
Signatures valid until: 16 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
47936	ECDSAP256SHA256 (13)	SHA256 67F250B85CDAC792…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
47936	KSK (257)	ECDSAP256SHA256 (13)
5017	ZSK (256)	ECDSAP256SHA256 (13)
58065	ZSK (256)	ECDSAP256SHA256 (13)
14521	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 47936 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Signatures valid until 2026-11-16 #30

The earliest DNSKEY/SOA signature expires at 2026-11-16 09:03 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 0 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

40 records at the apex

Found

Read from: 131.211.4.25:53

Type	Value	TTL
SOA	dns.uu.nl. hostmaster.uu.nl. 2014771343 3600 600 1209600 3600	300
NS	azie.net.uu.nl.	300
NS	ns1.zurich.surf.net.	300
NS	ns1.surfnet.nl.	300
NS	australie.net.uu.nl.	300
A	83.217.76.86	3600
AAAA	2a00:1c98:10:25::84	3600
MX	0 uu-nl.mail.protection.outlook.com.	3600
TXT	"bw=oqt3PIuXcjotJ6dvsl4A4bDskSdkcc56EiFM1AAAvZG3"	3600
TXT	"adobe-idp-site-verification=1f7a24c74c7d57187943e2d4ec7adcd37d3725b9a3a7d5857dd41637da012a6b"	3600
TXT	"MS=ms59510356"	3600
TXT	"atlassian-sending-domain-verification=72791b6c-e695-4116-8bbc-dd41675e5b98"	3600
TXT	"signrequest-domain-validation=40cdf51de7e51a3f84de9f6f8abd2a374aa3d89acb3d6927003fb52af7f022eb"	3600
TXT	"google-site-verification=K3bIDuPg2RhRc-qYqyEau7MUnp3aN4oIM_6rWDe1M34"	3600
TXT	"v=easydus; cg=4b46d154-7e0f-4088-8f50-0a0638724512"	3600
TXT	"faxination=fen44162647"	3600
TXT	"pipo"	3600
TXT	"brevo-code:af27a511cfadd67db014e628614c7404"	3600
TXT	"jamf-site-verification=DtaclJQTy3S-RtxeWCwovQ"	3600
TXT	"autodesk-domain-verification=RfCX8IHaalDkeE1T-2PE"	3600
TXT	"apple-domain-verification=wydMRl66PAsBwOVk"	3600
TXT	"HARICA-qgr0NyZthcl3PvsrBJ5"	3600
TXT	"HARICA-vQciRZCijpA23kPqiV9"	3600
TXT	"00D7Q000006uk9x=1TBQs00000007Sx"	3600
TXT	"pardot997561=644046e4432766fb73dbc13a959693022e9e4bdeebddbd369e6a7603dc62aafa"	3600
TXT	"QTXhE9VligPDA5a2xw9zRjxg01lC8iPwj7ouX3LnksdJltyh26E0WnV/t78xAeBXBb+8OJoWhfRRCJETQcCA1Q=="	3600
TXT	"cisco-ci-domain-verification=5842c46b62263bd02abd37a7754654a4dff107f06a2b66a8477e2cdc761505a8"	3600
TXT	"v=spf1 ip4:131.211.14.0/24 ip4:145.0.1.0/24 ip4:195.169.13.0/24 ip6:2001:610:188:540::/64 ip4:131.211.31.135 ip4:131.211.194.8/30 ip4:145.101.112.2 ip6:2001:610:188:446:145:101:112:2 ip4:216.146.32.161/27 ip4:170.107.183.89 ip4:212.123.232.134 " "ip4:145.100.12.197 include:mailplus.nl include:mailswitch.nl include:spf.mandrillapp.com include:spf.protection.outlook.com include:spf.flowmailer.net ip4:131.174.59.196/30 -all"	3600
TXT	"mistral-domain-verification=4f9997f25fec87a7fa949b979b242e6c4eeb1c28"	3600
TXT	"WLgjk988Kp7Qba9XFltAfkL2Toa2uc3OdjwkPdG8qI4iNXGc14jtd3MM7kC70OPfYW0cWVz5mHMuv5jaMkWcQg=="	3600
TXT	"atlassian-domain-verification=0iPg6zRItjFaaj30LVQ0AjAJ4N66NNbKdP5fnJ0H6Qg9optMLXJGhlkMR0Jqi/yO"	3600
CAA	0 issuewild "harica.gr"	3600
CAA	0 issue "sectigo.com"	3600
CAA	0 iodef "mailto:hostmaster@uu.nl"	3600
CAA	0 issue "harica.gr"	3600
CAA	0 issuewild "sectigo.com"	3600
CAA	0 issue "digicert.com"	3600
CAA	0 issue "letsencrypt.org"	3600
CAA	0 issuewild "digicert.com"	3600
CAA	0 issuewild "letsencrypt.org"	3600

Checks

✓ TTLs within range #32

TTLs: A 1h, AAAA 1h, MX 1h, NS 5m. The NS TTL at the parent is 1h and in the zone 5m; 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, digicert.com, letsencrypt.org.