rirtracker

IPv4 range · 512 addresses

81.23.240.0/23

Now

RIPE NCC statistics
Allocated (dated 2002-11-05) on 2026-10-09 (NL)
Registry
RIPE NCC
Holder
Castor Marine B.V.
From
RIPE NCC's statistics for 2026-10-09 and the latest transfer record

Latest change

Transfer log Merger/acquisition or reorganization

Reported
2026-09-09 (RIPE NCC)
Confidence
Confirmed
Inventory
No effect on RIPE NCC applicant inventory

Timeline since 2026-01-01 (1)

2026-09-09 RIPE NCC Transfer log Merger/acquisition or reorganization Confirmed
Transfer log
Merger/acquisition: Castor Communications BV (RIPE NCC) to Castor Marine B.V. (RIPE NCC)
From
Castor Communications BV RIPE NCC
To
Castor Marine B.V. RIPE NCC
Inventory
No effect on RIPE NCC applicant inventory

RIPE NCC's transfer log records a merger, acquisition or reorganization from Castor Communications BV (RIPE NCC) to Castor Marine B.V. (RIPE NCC) on 2026-09-09 19:00 UTC. The registration changed hands; it is not a new allocation from RIPE NCC.

Evidence (3) · classifier 1.1.0,
  1. Transfer log Transfer log: MERGER_ACQUISITION on 2026-09-09 19:00 UTC, Castor Communications BV (RIPE NCC) to Castor Marine B.V. (RIPE NCC); resources moved: 81.23.240.0/23 source · retrieved
  2. Before RIPE NCC delegated statistics 2026-09-08 (produced 2026-09-08T21:59:59+00:00), before the change: allocated (dated 2002-11-05) source · retrieved
  3. After RIPE NCC delegated statistics 2026-09-09 (produced 2026-09-09T21:59:59+00:00), after the change: allocated (dated 2002-11-05) source · retrieved

Transfer records (2)

Date (UTC)LogTypeRange movedFromTo
RIPE NCCMerger acquisition81.23.240.0/23 Castor Communications BV RIPE NCCCastor Marine B.V. RIPE NCC
RIPE NCCResource transfer81.23.240.0/23 Garnier Projects BV RIPE NCCCastor Communications BV RIPE NCC

Every record in the ARIN and RIPE NCC transfer logs that moved any part of this IPv4 range (ARIN's go back to 2009, the RIPE NCC's to 2012). A transfer between two registries is in both logs.

RDAP lookups

Not looked up. The tracker queries RDAP for changes as they're reported (on first sight, after 24 hours and after seven days); older changes aren't looked up because today's RDAP says nothing about the past.

This page as data: ip/81.23.240.0-81.23.241.255.json