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.
2026-06-01ARINTransfer logMerger/acquisition or reorganizationConfirmed
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,
Transfer logTransfer log: MERGER_ACQUISITION on 2026-06-01 16:06 UTC, Crown Castle Fiber LLC (ARIN) to Zayo Bandwidth (ARIN); resources moved: 204.28.104.0/21source · retrieved
BeforeARIN delegated statistics 2026-05-31 (produced 2026-05-31T13:00:19+00:00), before the report: allocated (dated 2014-07-08)source · retrieved
AfterARIN delegated statistics 2026-06-02 (produced 2026-06-02T13:00:19+00:00), after the report: allocated (dated 2014-07-08)source · retrieved
2024-03-04ARINTransfer logMerger/acquisition or reorganizationConfirmed
Transfer log
Merger/acquisition: Fibernet Direct (ARIN) to Crown Castle Fiber LLC (ARIN)
From
Fibernet Direct 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 Fibernet Direct (ARIN) to Crown Castle Fiber LLC (ARIN) on 2024-03-04 17:17 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,
Transfer logTransfer log: MERGER_ACQUISITION on 2024-03-04 17:17 UTC, Fibernet Direct (ARIN) to Crown Castle Fiber LLC (ARIN); resources moved: 204.28.104.0/21source · retrieved
BeforeARIN delegated statistics 2024-03-03 (produced 2024-03-03T14:00:45+00:00), before the report: allocated (dated 2014-07-08)source · retrieved
AfterARIN delegated statistics 2024-03-05 (produced 2024-03-05T14:00:45+00:00), after the report: allocated (dated 2014-07-08)source · retrieved
2014-07-08ARIN+ AddApparent reissuance of previously removed resourceStrong inference
ARIN-Issued
Add 204.28.104.0-204.28.111.255
Inventory
Likely issued from ARIN-controlled inventory
No transfer record matches. ARIN's statistics show it available on 2014-07-07 and allocated (dated 2014-07-08) on 2014-07-09. The tracker saw this range released from hold on 2010-12-02 (204.28.104.0-204.28.111.255), so it appears to have been issued again from ARIN's pool.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2014-07-08: "Add 204.28.104.0-204.28.111.255"source · retrieved
BeforeARIN delegated statistics 2014-07-07 (produced 2014-07-07T05:03:55+00:00), before the report: availablesource · retrieved
AfterARIN delegated statistics 2014-07-09 (produced 2014-07-09T05:04:00+00:00), after the report: allocated (dated 2014-07-08)source · retrieved
Classification history for this change (4 versions)
: Apparent reissuance of previously removed resource, strong inference (classifier 1.4.0) current
2010-12-02ARIN− RemoveUnresolved changeObserved only
ARIN-Issued
Remove 204.28.104.0-204.28.111.255
Inventory
Inventory effect unknown
ARIN-Issued says "Remove", but ARIN's statistics show it not issued on 2010-12-01 and not issued on 2010-12-03. (Until 2013-03-05, ARIN's statistics list only what's issued.) The registry's pool records from that time aren't public, so the tracker can't tell what was removed.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2010-12-02: "Remove 204.28.104.0-204.28.111.255"source · retrieved
BeforeARIN delegated statistics 2010-12-01, before the report: not issuedsource · retrieved
AfterARIN delegated statistics 2010-12-03, after the report: not issuedsource · retrieved
Classification history for this change (4 versions)
: Unresolved change, observed only (classifier 1.3.0)
: Unresolved change, observed only (classifier 1.3.1)
: Unresolved change, observed only (classifier 1.3.2)
: Unresolved change, observed only (classifier 1.4.0) current
2010-03-08ARINNot in ARIN-IssuedRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2010-05-07. Possible reissue candidate after this date; not confirmed available.
Removed from active registration. ARIN-Issued didn't list this; the tracker found it by comparing ARIN's daily statistics. ARIN's statistics show it allocated (dated 2009-01-16) on 2010-03-07 and not issued on 2010-03-09. (Until 2013-03-05, ARIN's statistics list only what's issued.) Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 space for 60 days before reissuing it, so the estimated hold end is 2010-05-07. This does not confirm availability.
Evidence (3) · classifier 1.4.0,
StatisticsNot listed in ARIN-Issued; found by comparing ARIN's daily statistics: 204.28.104.0/21 allocated on 2010-03-08, not listed on 2010-03-09source · retrieved
BeforeARIN delegated statistics 2010-03-07, before the report: allocated (dated 2009-01-16)source · retrieved
AfterARIN delegated statistics 2010-03-09, after the report: not issuedsource · retrieved
Classification history for this change (4 versions)
: Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.0)
: Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.1)
: Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.2)
: Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.4.0) current
2009-01-16ARIN+ AddApparent new issuanceStrong inference
ARIN-Issued
Add 204.28.104.0-204.28.111.255
Inventory
Likely issued from ARIN-controlled inventory
No transfer record matches. ARIN's statistics show it not issued on 2009-01-15 and allocated (dated 2009-01-16) on 2009-01-17. (Until 2013-03-05, ARIN's statistics list only what's issued.) It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2009-01-16: "Add 204.28.104.0-204.28.111.255"source · retrieved
BeforeARIN delegated statistics 2009-01-15, before the report: not issuedsource · retrieved
AfterARIN delegated statistics 2009-01-17, after the report: allocated (dated 2009-01-16)source · retrieved
Classification history for this change (4 versions)
: Apparent new issuance, strong inference (classifier 1.3.0)
: Apparent new issuance, strong inference (classifier 1.3.1)
: Apparent new issuance, strong inference (classifier 1.3.2)
: Apparent new issuance, strong inference (classifier 1.4.0) current
Transfer records (2)
Date (UTC)
Log
Type
Range moved
From
To
ARIN
Merger acquisition
204.28.104.0/21
Crown Castle Fiber LLC ARIN
Zayo Bandwidth ARIN
ARIN
Merger acquisition
204.28.104.0/21
Fibernet Direct ARIN
Crown Castle Fiber 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.