Domain report: ruu.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

warn

australie.net.uu.nl, azie.net.uu.nl

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
NS in the zone: australie.net.uu.nl, azie.net.uu.nl

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

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: australie.net.uu.nl, azie.net.uu.nl.

#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 one network

all IPv4 addresses are in 131.211.4.0/24. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).

#10
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS1103 (SURFNET-NL - SURF B.V., NL): 2 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
!

No IPv6

None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.

#13

Nameservers

pass

2 of 2 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
australie.net.uu.nl 131.211.4.25	NOERROR, 13 ms, authoritative	no	yes / yes	refused	-
azie.net.uu.nl 131.211.4.8	NOERROR, 11 ms, authoritative	no	yes / yes	refused	-

Checks

✓ All respond #14

All 2 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 2026011860 · primary azie.net.uu.nl

Found

Primary (MNAME): azie.net.uu.nl
Contact (RNAME): hostmaster.uu.nl
Serial: 2026011860
Refresh / retry: 28800 s / 14400 s
Expire: 604800 s
Negative TTL: 3600 s

Serial per nameserver

Nameserver	Serial
australie.net.uu.nl (131.211.4.25)	2026011860
azie.net.uu.nl (131.211.4.8)	2026011860

Checks

✓ Serial 2026011860 everywhere #22

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

SOA refresh 8h, retry 4h, expire 7d, negative TTL 1h.
✓ Primary is a public nameserver #24

The primary nameserver azie.net.uu.nl is one of the listed nameservers.
✓ Contact hostmaster@uu.nl #25

The SOA RNAME hostmaster.uu.nl means hostmaster@uu.nl.
✓ Date-based serial #26

The serial 2026011860 follows the YYYYMMDDnn convention (2026-01-18).

DNSSEC

warn

Signed, but no DS at parent

Found

Validated by resolver: no
Denial of existence: NSEC3
NSEC3: 10 iterations, 16-byte salt
Signatures valid until: 20 November 2026

DNSKEY in the zone

Key tag	Role	Algorithm
6085	ZSK (256)	ECDSAP256SHA256 (13)
42261	ZSK (256)	ECDSAP256SHA256 (13)
19990	ZSK (256)	ECDSAP256SHA256 (13)
54701	ZSK (256)	ECDSAP256SHA256 (13)
44374	KSK (257)	ECDSAP256SHA256 (13)

Checks

!

Signed but not delegated securely

The zone is signed but the parent has no DS record, so the signatures are not used. Publish the DS record at your registrar.

#27
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Signatures valid until 2026-11-20 #30

The earliest DNSKEY/SOA signature expires at 2026-11-20 07:32 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

info

3 records at the apex

Found

Read from: 131.211.4.25:53

Type	Value	TTL
SOA	azie.net.uu.nl. hostmaster.uu.nl. 2026011860 28800 14400 604800 3600	3600
NS	azie.net.uu.nl.	3600
NS	australie.net.uu.nl.	3600

Checks

✓ TTLs within range #32

TTLs: 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.
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