Domain report: ru.nl

Registration

info

.nl country-code

Found

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

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

#3

Delegation

info

ns1.ru.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: ns1.ru.nl, ns1.surfnet.nl, ns1.zurich.surf.net
NS in the zone: ns1.ru.nl, ns1.surfnet.nl, ns1.zurich.surf.net

Nameserver	Addresses	Network (AS)	Glue
ns1.ru.nl	131.174.69.254	AS1103 SURFNET-NL - SURF B.V., NL	131.174.69.254
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

✓ 3 nameservers #6

Delegated to ns1.ru.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: ns1.ru.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): 3 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: ns1.ru.nl.

#13

Nameservers

info

5 of 5 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.ru.nl 131.174.69.254	NOERROR, 12 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, 10 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 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.
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 2009567269 · primary ns3.ru.nl

Found

Primary (MNAME): ns3.ru.nl
Contact (RNAME): netmaster.ru.nl
Serial: 2009567269
Refresh / retry: 3600 s / 360 s
Expire: 604800 s
Negative TTL: 86400 s

Serial per nameserver

Nameserver	Serial
ns1.ru.nl (131.174.69.254)	2009567269
ns1.surfnet.nl (192.87.106.101)	2009567269
ns1.surfnet.nl (2001:610:1:800a:192:87:106:101)	2009567269
ns1.zurich.surf.net (195.176.255.9)	2009567269
ns1.zurich.surf.net (2001:620:0:9::1103)	2009567269

Checks

✓ Serial 2009567269 everywhere #22

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

SOA refresh 1h, retry 6m, expire 7d, negative TTL 1d.
i

Hidden master

The primary nameserver ns3.ru.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 netmaster@ru.nl #25

The SOA RNAME netmaster.ru.nl means netmaster@ru.nl.
✓ Timestamp serial #26

The serial 2009567269 is a Unix timestamp (2033-09-05 21:07 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 11-byte salt
Signatures valid until: 24 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
28744	RSASHA256 (8)	SHA256 CFBC56B85080E622…	NO
45436	RSASHA256 (8)	SHA256 E7DADE1959C1FBDC…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
61819	ZSK (256)	RSASHA256 (8)
45436	KSK (257)	RSASHA256 (8)

Checks

✓ Signed and validated #27

The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
i

Unused DS records

These DS records match no key in the zone: key tag 28744 (SHA256). That is normal during a key rollover; otherwise remove them.

#28
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Short-lived signatures (online signing) #30

Signatures are valid for 96h0m0s and created on demand; the current one was made at 2026-10-20 23:29 UTC and expires at 2026-10-24 23:59 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations and a 11-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

26 records at the apex

Found

Read from: 131.174.69.254:53

Type	Value	TTL
SOA	ns3.ru.nl. netmaster.ru.nl. 2009567270 3600 360 604800 86400	28800
NS	ns1.surfnet.nl.	28800
NS	ns1.zurich.surf.net.	28800
NS	ns1.ru.nl.	28800
A	131.174.78.60	600
MX	0 ru-nl.m-v1.mx.microsoft.	300
TXT	"d365mktkey=XGnAIxRQCCLkJPJ86uCVFTnDUwSn2ndbxRAo6ySSwpUx"	300
TXT	"d365mktkey=dmCT8FfyOHyV4UsEqKIK7P99XxO932fLXlanuRklhMkx"	300
TXT	"d365mktkey=FffCw4fp3A1ZHCdERpWcTyjFUJtJ4S57qLebUFAdMDMx"	300
TXT	"knowbe4-site-verification=a38acc02e555fc59878a885c661e36ef"	300
TXT	"d365mktkey=jvxUlCXg0oosqxeR9Ct52M4gPCYzFVmzElxRwUzwzGAx"	300
TXT	"cisco-ci-domain-verification=5b6d3b9b6b8ec2592d13429c415ed26778e6ca8c6bd9078511ac037b1353b81d"	300
TXT	"ZOOM_verify_uP1aZu8wR2-CHSmrBtCvTg"	300
TXT	"v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all"	300
TXT	"atlassian-domain-verification=5Cn5OZRbvE8o2BFCTuh1h3OsI7fIlbITmxCM3bT7JLc/BRQ1i7cxYJQM5gRXdhGZ"	300
TXT	"atlassian-domain-verification=Qoi8aah4vKhyujDNzCPaIovYK0aQ13lVo2lQVp2BbKDwt9uX2FG9a0/2kR06nLs/"	300
TXT	"MS=ms78416191"	300
TXT	"MS=30C0AFAD43C669095DF6BA98606BBA3CBF203C4F"	300
TXT	"Radboud University Nijmegen, The Netherlands"	300
TXT	"paloaltonetworks-site-verification=93590266bb125bbf65c9c8fcf694442a4955a6a5b07094d6ee03d0ec4d7bff67"	300
TXT	"HARICA-Vw9MiLhSzhis4oNuw1a"	300
TXT	"00D0O000000qnzJ=1TBJy00000009xl"	300
TXT	"sending_domain469931=a1cec05a37422f86eaac35edb52100b0346e866f27474a07f7ca867b78e55e14"	300
CAA	0 issue "amazon.com"	28800
CAA	0 issue "harica.gr"	28800
CAA	0 issue "letsencrypt.org"	28800

Checks

✓ TTLs within range #32

TTLs: A 10m, 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.
✓ No wildcard #34

Names that don't exist return NXDOMAIN.
✓ CAA restricts issuance #35

Certificates may be issued by: amazon.com, harica.gr, letsencrypt.org.