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Data as of Nov 7, 2026

81.23.240.0/24

No anonymizer space · no proxy exits in 30 days

Castor Marine B.V.

Announcement
81.23.240.0/23
RPKI valid
Announced by
AS61429
Type
Internet provider
Risk
0 / 100 · Low

Registrations in this block

The registry's network records over this block, widest first, each under its parent.

RangeAddressesNetnameHolderTypeCreatedAbuse contact
81.23.240.0/23512NL-CASTOR-20021105Castor Marine B.V. (ORG-CHB2-RIPE) · NLALLOCATED PAApr 16, 2021abuse@castornetworks.com
└ 81.23.240.0/24256NL-CASTOR-IDIRECTunknownASSIGNED PAApr 16, 2021abuse@castornetworks.com
via NL-CASTOR-20021105

A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
Announced by

Covering announcement 81.23.240.0/23

Prefix
81.23.240.0/23
Announced by
AS61429 Castor Marine B.V.
Type
Internet provider
RPKI
RPKI valid
Netname
NL-CASTOR-20021105
Registrant
Castor Marine B.V.
RIR
RIPE NCC
Origin network

AS61429

NL
Name
Castor Marine B.V.
Type
Internet provider
Registered
Oct 12, 2012
Domain
castornetworks.com
Industry
Internet Service Provider (ISP)
Spamhaus ASN-DROP
not listed