rirtracker

IPv4 range · 65,536 addresses

144.121.0.0/16

Now

ARIN statistics
Allocated (dated 2016-04-29) (US), in the latest file
Registry
ARIN
Holder
Zayo Bandwidth
From
ARIN's latest statistics and the latest transfer record

Latest change

Transfer log Merger/acquisition or reorganization

Reported
2026-06-01 (ARIN)
Confidence
Confirmed
Inventory
No effect on ARIN applicant inventory

Timeline (3)

Every change the tracker has found, newest first. It covers ARIN from 2008-12-01, the RIPE NCC from 2010-04-23, APNIC from 2008-02-15, LACNIC from 2012-06-29 and AFRINIC from 2012-10-03.

2026-06-01 ARIN Transfer log Merger/acquisition or reorganization Confirmed
Transfer log
Merger/acquisition: Crown Castle Fiber LLC (ARIN) to Zayo Bandwidth (ARIN)
From
Crown Castle Fiber LLC ARIN
To
Zayo Bandwidth ARIN
Inventory
No effect on ARIN applicant inventory

ARIN's transfer log records a merger, acquisition or reorganization from Crown Castle Fiber LLC (ARIN) to Zayo Bandwidth (ARIN) on 2026-06-01 16:06 UTC. The registration changed hands; it is not a new allocation from ARIN. ARIN-Issued and ARIN's statistics don't show this change; only the transfer log records it.

Evidence (3) · classifier 1.4.0,
  1. Transfer log Transfer log: MERGER_ACQUISITION on 2026-06-01 16:06 UTC, Crown Castle Fiber LLC (ARIN) to Zayo Bandwidth (ARIN); resources moved: 144.121.0.0/16 source · retrieved
  2. Before ARIN delegated statistics 2026-05-31 (produced 2026-05-31T13:00:19+00:00), before the report: allocated (dated 2016-04-29) source · retrieved
  3. After ARIN delegated statistics 2026-06-02 (produced 2026-06-02T13:00:19+00:00), after the report: allocated (dated 2016-04-29) source · retrieved
2024-02-29 ARIN Transfer log Merger/acquisition or reorganization Confirmed
Transfer log
Merger/acquisition: Lightower Fiber Networks I, LLC (ARIN) to Crown Castle Fiber LLC (ARIN)
From
Lightower Fiber Networks I, LLC ARIN
To
Crown Castle Fiber LLC ARIN
Inventory
No effect on ARIN applicant inventory

ARIN's transfer log records a merger, acquisition or reorganization from Lightower Fiber Networks I, LLC (ARIN) to Crown Castle Fiber LLC (ARIN) on 2024-02-29 20:25 UTC. The registration changed hands; it is not a new allocation from ARIN. ARIN-Issued and ARIN's statistics don't show this change; only the transfer log records it.

Evidence (3) · classifier 1.4.0,
  1. Transfer log Transfer log: MERGER_ACQUISITION on 2024-02-29 20:25 UTC, Lightower Fiber Networks I, LLC (ARIN) to Crown Castle Fiber LLC (ARIN); resources moved: 144.121.0.0/16 source · retrieved
  2. Before ARIN delegated statistics 2024-02-28 (produced 2024-02-28T14:00:43+00:00), before the report: allocated (dated 2016-04-29) source · retrieved
  3. After ARIN delegated statistics 2024-03-01 (produced 2024-03-01T14:00:43+00:00), after the report: allocated (dated 2016-04-29) source · retrieved
2016-04-29 ARIN + Add Intra-ARIN transfer Confirmed
ARIN-Issued
Add 144.121.0.0-144.121.255.255
From
Weyerhaeuser Company ARIN
To
Lightower Fiber Networks I, LLC ARIN
Inventory
No effect on ARIN applicant inventory

ARIN's transfer log records a transfer from Weyerhaeuser Company (ARIN) to Lightower Fiber Networks I, LLC (ARIN) on 2016-04-29 19:45 UTC. ARIN-Issued lists it as "Add" because the registration changed hands; it is not a new allocation from ARIN.

Evidence (4) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2016-04-29: "Add 144.121.0.0-144.121.255.255" source · retrieved
  2. Transfer log Transfer log: RESOURCE_TRANSFER on 2016-04-29 19:45 UTC, Weyerhaeuser Company (ARIN) to Lightower Fiber Networks I, LLC (ARIN); resources moved: 144.121.0.0/16 source · retrieved
  3. Before ARIN delegated statistics 2016-04-28 (produced 2016-04-28T05:04:39+00:00), before the report: assigned (dated 1990-12-03) source · retrieved
  4. After ARIN delegated statistics 2016-04-30 (produced 2016-04-30T05:04:53+00:00), after the report: allocated (dated 2016-04-29) source · retrieved
Classification history for this change (4 versions)
  1. : Intra-ARIN transfer, confirmed (classifier 1.3.0)
  2. : Intra-ARIN transfer, confirmed (classifier 1.3.1)
  3. : Intra-ARIN transfer, confirmed (classifier 1.3.2)
  4. : Intra-ARIN transfer, confirmed (classifier 1.4.0) current

Transfer records (3)

Date (UTC)LogTypeRange movedFromTo
ARINMerger acquisition144.121.0.0/16 Crown Castle Fiber LLC ARINZayo Bandwidth ARIN
ARINMerger acquisition144.121.0.0/16 Lightower Fiber Networks I, LLC ARINCrown Castle Fiber LLC ARIN
ARINResource transfer144.121.0.0/16 Weyerhaeuser Company ARINLightower Fiber Networks I, LLC ARIN

Every record in the ARIN, RIPE NCC, APNIC, LACNIC and AFRINIC transfer logs that moved any part of this IPv4 range (ARIN's from 2009, the RIPE NCC's from 2012, APNIC's from 2010, LACNIC's from 2016, AFRINIC's from 2018). 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/144.121.0.0-144.121.255.255.json