rirtracker

IPv6 range · 79,228,162,514,264,337,593,543,950,336 addresses

2604:1a00::/32

Now

ARIN statistics
Allocated (dated 2013-02-07) (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 (5)

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: 2604:1a00::/32 source · retrieved
  2. Before ARIN delegated statistics 2026-05-31 (produced 2026-05-31T13:00:19+00:00), before the report: allocated (dated 2013-02-07) source · retrieved
  3. After ARIN delegated statistics 2026-06-02 (produced 2026-06-02T13:00:19+00:00), after the report: allocated (dated 2013-02-07) source · retrieved
2024-01-03 ARIN Transfer log Merger/acquisition or reorganization Confirmed
Transfer log
Merger/acquisition: Open Access Inc. (ARIN) to Crown Castle Fiber LLC (ARIN)
From
Open Access Inc. 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 Open Access Inc. (ARIN) to Crown Castle Fiber LLC (ARIN) on 2024-01-03 20:49 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 2024-01-03 20:49 UTC, Open Access Inc. (ARIN) to Crown Castle Fiber LLC (ARIN); resources moved: 2604:1a00::/32 source · retrieved
  2. Before ARIN delegated statistics 2024-01-02 (produced 2024-01-02T14:00:34+00:00), before the report: allocated (dated 2013-02-07) source · retrieved
  3. After ARIN delegated statistics 2024-01-04 (produced 2024-01-04T14:00:34+00:00), after the report: allocated (dated 2013-02-07) source · retrieved
2013-02-07 ARIN + Add Apparent reissuance of previously removed resource Strong inference
ARIN-Issued
Add 2604:1A00::-2604:1A00:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF
Inventory
Likely issued from ARIN-controlled inventory

No transfer record matches. ARIN's statistics show it not issued on 2013-02-06 and allocated (dated 2013-02-07) on 2013-02-08. (Until 2013-03-05, ARIN's statistics list only what's issued.) The tracker saw this range removed from registration on 2012-11-07 (2604:1a00::/32), so it appears to have been issued again from ARIN's pool.

Evidence (3) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2013-02-07: "Add 2604:1A00::-2604:1A00:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF" source · retrieved
  2. Before ARIN delegated statistics 2013-02-06, before the report: not issued source · retrieved
  3. After ARIN delegated statistics 2013-02-08, after the report: allocated (dated 2013-02-07) source · retrieved
Classification history for this change (4 versions)
  1. : Apparent reissuance of previously removed resource, strong inference (classifier 1.3.0)
  2. : Apparent reissuance of previously removed resource, strong inference (classifier 1.3.1)
  3. : Apparent reissuance of previously removed resource, strong inference (classifier 1.3.2)
  4. : Apparent reissuance of previously removed resource, strong inference (classifier 1.4.0) current
2013-02-07 ARIN − Remove Unresolved change Observed only
ARIN-Issued
Remove 2604:1A00::-2604:1A00:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF
Inventory
Inventory effect unknown

ARIN-Issued says "Remove", but ARIN's statistics show it not issued on 2013-02-06 and allocated (dated 2013-02-07) on 2013-02-08. (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,
  1. ARIN-Issued ARIN-Issued report for 2013-02-07: "Remove 2604:1A00::-2604:1A00:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF" source · retrieved
  2. Before ARIN delegated statistics 2013-02-06, before the report: not issued source · retrieved
  3. After ARIN delegated statistics 2013-02-08, after the report: allocated (dated 2013-02-07) source · retrieved
Classification history for this change (4 versions)
  1. : Unresolved change, observed only (classifier 1.3.0)
  2. : Unresolved change, observed only (classifier 1.3.1)
  3. : Unresolved change, observed only (classifier 1.3.2)
  4. : Unresolved change, observed only (classifier 1.4.0) current
2012-11-07 ARIN Not in ARIN-Issued Removed (return, revocation or reclamation not publicly distinguishable) Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2013-05-07. 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 2010-10-20) on 2012-11-06 and not issued on 2012-11-08. (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 IPv6 space for 6 calendar months before reissuing it, so the estimated hold end is 2013-05-07. This does not confirm availability.

Evidence (3) · classifier 1.4.0,
  1. Statistics Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 2604:1a00::/32 allocated on 2012-11-07, not listed on 2012-11-08 source · retrieved
  2. Before ARIN delegated statistics 2012-11-06, before the report: allocated (dated 2010-10-20) source · retrieved
  3. After ARIN delegated statistics 2012-11-08, after the report: not issued source · retrieved
Classification history for this change (4 versions)
  1. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.0)
  2. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.1)
  3. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.2)
  4. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.4.0) current

Transfer records (2)

Date (UTC)LogTypeRange movedFromTo
ARINMerger acquisition2604:1a00::/32 Crown Castle Fiber LLC ARINZayo Bandwidth ARIN
ARINMerger acquisition2604:1a00::/32 Open Access Inc. ARINCrown Castle Fiber LLC ARIN

Every record in the ARIN, RIPE NCC, APNIC, LACNIC and AFRINIC transfer logs that moved any part of this IPv6 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/2604.1a00..-2604.1a00.ffff.ffff.ffff.ffff.ffff.ffff.json