Domain report: leiden.nl

Registration

info

.nl country-code · Registrar.eu

Found

TLD: .nl (country-code)
ICANN policies apply: no
Registrar: Registrar.eu
Registered: 22 February 1996
Last changed: 11 July 2025
Status: active
Registry nameservers: ns1.hostingcore.nl, ns2.hostingcore.eu, ns3.hostingcore.domains
RDAP server: https://rdap.sidn.nl/

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

Expiry date not published

The registry does not publish the expiry date in RDAP. Check it with your registrar.

#3
i

No transfer lock

The domain has no transfer lock (status: active). A registrar lock protects against unauthorized transfers.

#4
✓ Registry and delegation match #5

The nameservers registered at the registry are the ones published in DNS.

Delegation

pass

ns1.hostingcore.nl, ns2.hostingcore.eu, ns3.hostingcore.domains

Found

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

Nameserver	Addresses	Network (AS)	Glue
ns1.hostingcore.nl	83.136.17.12 2a03:7000:c0c0:17::12	AS31673 UNISERVER-AS - Uniserver Internet B.V., NL AS31673 UNISERVER-AS - Uniserver Internet B.V., NL	83.136.17.12 2a03:7000:c0c0:17::12
ns2.hostingcore.eu	74.234.161.171 2603:1020:201:f::186	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US	-
ns3.hostingcore.domains	51.12.210.244 2603:1020:1001::3d	AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US	-

Checks

✓ 3 nameservers #6

Delegated to ns1.hostingcore.nl, ns2.hostingcore.eu, ns3.hostingcore.domains.
✓ 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 different networks #10

The nameservers are spread over 3 IPv4 /24s and 3 IPv6 /48s.
✓ 2 autonomous systems #11

The nameservers are spread over: AS31673 (UNISERVER-AS - Uniserver Internet B.V., NL): 2 addresses; AS8075 (MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US): 4 addresses.
✓ Nameserver names under 3 TLDs #12

Nameserver names use the TLDs .domains, .eu, .nl.
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

Nameservers

pass

6 of 6 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.hostingcore.nl 83.136.17.12	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-
ns1.hostingcore.nl 2a03:7000:c0c0:17::12	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-
ns2.hostingcore.eu 74.234.161.171	NOERROR, 15 ms, authoritative	no	yes / yes	refused	-
ns2.hostingcore.eu 2603:1020:201:f::186	NOERROR, 15 ms, authoritative	no	yes / yes	refused	-
ns3.hostingcore.domains 51.12.210.244	NOERROR, 28 ms, authoritative	no	yes / yes	refused	-
ns3.hostingcore.domains 2603:1020:1001::3d	NOERROR, 30 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.
✓ 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

warn

serial 2025044155 · primary ns1.hostingcore.nl

Found

Primary (MNAME): ns1.hostingcore.nl
Contact (RNAME): beheer.nedcomp.nl
Serial: 2025044155
Refresh / retry: 14400 s / 3600 s
Expire: 1209600 s
Negative TTL: 30 s

Serial per nameserver

Nameserver	Serial
ns1.hostingcore.nl (83.136.17.12)	2025044155
ns1.hostingcore.nl (2a03:7000:c0c0:17::12)	2025044155
ns2.hostingcore.eu (74.234.161.171)	2025044155
ns2.hostingcore.eu (2603:1020:201:f::186)	2025044155
ns3.hostingcore.domains (51.12.210.244)	2025044155
ns3.hostingcore.domains (2603:1020:1001::3d)	2025044155

Checks

✓ Serial 2025044155 everywhere #22

All nameservers serve the same version of the zone.
!

Unusual SOA timers

negative caching TTL (minimum) 30s is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 4h, retry 1h, expire 14d, negative TTL 30s.

#23
✓ Primary is a public nameserver #24

The primary nameserver ns1.hostingcore.nl is one of the listed nameservers.
✓ Contact beheer@nedcomp.nl #25

The SOA RNAME beheer.nedcomp.nl means beheer@nedcomp.nl.
✓ Timestamp serial #26

The serial 2025044155 is a Unix timestamp (2034-03-04 00:15 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 0 iterations, 1-byte salt
Signatures valid until: 23 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
23205	ECDSAP256SHA256 (13)	SHA256 29BE5602A2A4CB87…	yes
25283	ECDSAP256SHA256 (13)	SHA256 BCAC136D73461F3E…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
23205	KSK (257)	ECDSAP256SHA256 (13)
50885	ZSK (256)	ECDSAP256SHA256 (13)
17681	ZSK (256)	ECDSAP256SHA256 (13)
25283	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 23205 (SHA256), key tag 25283 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
!

Signatures expire soon

The earliest signature expires at 2026-10-23 16:49 UTC (in 43h0m0s). Check that automatic re-signing works.

#30
!

NSEC3 with extra iterations or salt

NSEC3 uses 0 iterations and a 1-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

warn

32 records at the apex

Found

Read from: 83.136.17.12:53

Type	Value	TTL
SOA	ns1.hostingcore.nl. beheer.nedcomp.nl. 2025044155 14400 3600 1209600 30	30
NS	ns2.hostingcore.eu.	30
NS	ns3.hostingcore.domains.	30
NS	ns1.hostingcore.nl.	30
A	185.144.224.28	30
A	31.7.0.60	30
A	31.7.6.87	30
AAAA	2a03:9700:8000:1::23	30
AAAA	2a03:9700:8000:1::25	30
AAAA	2a03:9700:8000:1::24	30
MX	0 leiden-nl.x-v1.mx.microsoft.	30
TXT	"QuoVadis=ec92dfed-f51e-4b45-8cfb-0cf711dc6e2d"	30
TXT	"_vtuq9vxrmx2rvm2mxuwmpg7fgn0uifi"	30
TXT	"/0HOWPDegMvWBe4oJ9PqDdM3YkThvIT3ko17a2untqYjXlMp2R4dlbzkqtTOcjkM5ZwnLhmJ3dr7ukWT6Lnhqw=="	30
TXT	"v=spf1 ip4:93.119.0.189 ip4:185.190.86.25 ip4:185.190.86.75 ip4:185.190.86.77 ip4:90.145.221.191 ip4:185.136.64.128/27 ip4:185.136.65.128/27 include:spf.eprov.nl " "include:spf.pinkprivate.cloud ip4:185.92.61.41 ip4:185.92.61.42 ip4:85.90.72.66 ip4:87.249.113.145 ip4:87.249.113.154 ip4:81.246.113.50 ip4:87.233.240.35 " "ip4:212.72.62.129/27 ip4:195.137.215.48 include:servers.mcsv.net include:_spf.easycruit.com include:spf.protection.outlook.com include:_spf.zivver.com " "include:_spf.mailplus.nl include:spf.topdesk.net ip4:185.136.64.10 ip4:185.136.64.11 ip4:185.136.65.10 ip4:185.136.65.11 ip4:87.233.198.3 ip6:2001:9a8:a6:0:87:233:198:3 " "ip4:87.233.230.114 ip6:2001:9a8:0:112:87:233:230:114 ip4:80.113.11.169 ip4:18.198.243.240 ip4:52.28.58.88 ip4:18.158.179.24 ip4:3.124.160.66 ip4:18.157.97.229 " "ip4:18.157.99.112 ip4:37.17.212.82 ip4:176.74.239.242 ip4:213.208.232.101 ip4:194.53.72.4 ip4:194.53.72.10 ip4:194.53.72.252 ip6:2001:4cb8:59c:1::25 ip6:2A07:CB84:3075:912:10:10:159:25 " "ip6:2A07:CB81:3711:815:10:10:160:25 ip4:94.232.164.10 ip4:132.164.22.143 ~all"	30
TXT	"apple-domain-verification=xTWS0CtyjU1fjSRq"	30
TXT	"5c3462gcxskjrcs5d5xs7c20zlh1hzn8"	30
TXT	"MS=ms73828296"	30
TXT	"Aegsqi1K4izoVyRMo0cg9CpS+bFIOgLtNfjk8A8Ezc4="	30
TXT	"google-site-verification=NmP9sfZXGoKMiiucn3_66UwigPehGJsJ4PQD4gYGBAQ"	30
TXT	"detectify-verification=2ffd1a7d0b7586932f3321e07efaba27"	30
TXT	"0c682074-8bef-4845-b196-a205ba43fe92-25072018"	30
TXT	"_ekm14vuy854bb514c48ot0r32ddnfp5"	30
TXT	"DomainVerification=QA0YEX4IWRUOJE2US53Q30H62MKOFVRX4GQZG1KG8LZTWQR9TY130LM0W9CMTWU8"	30
CAA	0 issuewild "quovadisglobal.com"	30
CAA	0 iodef "mailto:webmaster@leiden.nl"	30
CAA	0 issue "quovadisglobal.com"	30
CAA	0 issuewild "sectigo.com"	30
CAA	0 issue "letsencrypt.org"	30
CAA	0 issue "amazon.com"	30
CAA	0 issue "sectigo.com"	30
CAA	0 issue "digicert.com"	30

Checks

!

Very low TTLs

These records have a TTL below 5m, causing extra queries and slower lookups: A (30s), AAAA (30s), MX (30s), NS (30s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1h and in the zone 30s; resolvers may use either.

#32
✓ 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: quovadisglobal.com, sectigo.com, letsencrypt.org, amazon.com, digicert.com.