rirtracker

IPv4 range · 4,096 addresses

216.221.16.0/20

Now

ARIN statistics
Allocated (dated 2019-01-25) (US), in the latest file
Registry
ARIN
Holder
Arista Networks, Inc.
From
ARIN's latest statistics and the latest transfer record

Latest change

Transfer log Merger/acquisition or reorganization

Reported
2026-01-13 (ARIN)
Confidence
Confirmed
Inventory
No effect on ARIN applicant inventory

Timeline (7)

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.

2026-01-13 ARIN Transfer log Merger/acquisition or reorganization Confirmed
Transfer log
Merger/acquisition: Avago Technologies U.S. Inc. (ARIN) to Arista Networks, Inc. (ARIN)
From
Avago Technologies U.S. Inc. ARIN
To
Arista Networks, Inc. ARIN
Inventory
No effect on ARIN applicant inventory

ARIN's transfer log records a merger, acquisition or reorganization from Avago Technologies U.S. Inc. (ARIN) to Arista Networks, Inc. (ARIN) on 2026-01-13 19:37 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 2026-01-13 19:37 UTC, Avago Technologies U.S. Inc. (ARIN) to Arista Networks, Inc. (ARIN); resources moved: 216.221.16.0/20 source · retrieved
  2. Before ARIN delegated statistics 2026-01-12 (produced 2026-01-12T14:00:47+00:00), before the report: allocated (dated 2019-01-25) source · retrieved
  3. After ARIN delegated statistics 2026-01-14 (produced 2026-01-14T14:00:47+00:00), after the report: allocated (dated 2019-01-25) source · retrieved
2025-11-14 ARIN Transfer log Merger/acquisition or reorganization Confirmed
Transfer log
Merger/acquisition: VMWare, LLC (ARIN) to Avago Technologies U.S. Inc. (ARIN)
From
VMWare, LLC ARIN
To
Avago Technologies U.S. Inc. ARIN
Inventory
No effect on ARIN applicant inventory

ARIN's transfer log records a merger, acquisition or reorganization from VMWare, LLC (ARIN) to Avago Technologies U.S. Inc. (ARIN) on 2025-11-14 17:15 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 2025-11-14 17:15 UTC, VMWare, LLC (ARIN) to Avago Technologies U.S. Inc. (ARIN); resources moved: 216.221.16.0/20 source · retrieved
  2. Before ARIN delegated statistics 2025-11-13 (produced 2025-11-13T14:00:46+00:00), before the report: allocated (dated 2019-01-25) source · retrieved
  3. After ARIN delegated statistics 2025-11-15 (produced 2025-11-15T14:00:50+00:00), after the report: allocated (dated 2019-01-25) source · retrieved
2020-07-13 ARIN Transfer log Merger/acquisition or reorganization Confirmed
Transfer log
Merger/acquisition: Pivotal Software, Inc. (ARIN) to VMWare, Inc. (ARIN)
From
Pivotal Software, Inc. ARIN
To
VMWare, Inc. ARIN
Inventory
No effect on ARIN applicant inventory

ARIN's transfer log records a merger, acquisition or reorganization from Pivotal Software, Inc. (ARIN) to VMWare, Inc. (ARIN) on 2020-07-13 11:13 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 2020-07-13 11:13 UTC, Pivotal Software, Inc. (ARIN) to VMWare, Inc. (ARIN); resources moved: 216.221.16.0/20 source · retrieved
  2. Before ARIN delegated statistics 2020-07-12 (produced 2020-07-12T14:00:13+00:00), before the report: assigned (dated 2019-01-25) source · retrieved
  3. After ARIN delegated statistics 2020-07-14 (produced 2020-07-14T14:00:13+00:00), after the report: allocated (dated 2019-01-25) source · retrieved
2019-01-25 ARIN + Add Apparent reissuance of previously removed resource Strong inference
ARIN-Issued
Add 216.221.16.0-216.221.31.255
Inventory
Likely issued from ARIN-controlled inventory

No transfer record matches. ARIN's statistics show it reserved on 2019-01-24 and assigned (dated 2019-01-25) on 2019-01-26. The tracker saw this range released from hold on 2018-12-18 (216.221.16.0-216.221.31.255), 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 2019-01-25: "Add 216.221.16.0-216.221.31.255" source · retrieved
  2. Before ARIN delegated statistics 2019-01-24 (produced 2019-01-24T06:00:15+00:00), before the report: reserved source · retrieved
  3. After ARIN delegated statistics 2019-01-26 (produced 2019-01-26T06:00:17+00:00), after the report: assigned (dated 2019-01-25) 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
2019-01-25 ARIN − Remove Change to ARIN's own pool record Strong inference
ARIN-Issued
Remove 216.221.16.0-216.221.31.255
Inventory
Part of the issuance reported the same day

ARIN's statistics show it reserved on 2019-01-24 and assigned (dated 2019-01-25) on 2019-01-26. ARIN removed its own pool record for this range as part of issuing it: the same report adds 216.221.16.0-216.221.31.255. The issuance is explained on that line.

Evidence (3) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2019-01-25: "Remove 216.221.16.0-216.221.31.255" source · retrieved
  2. Before ARIN delegated statistics 2019-01-24 (produced 2019-01-24T06:00:15+00:00), before the report: reserved source · retrieved
  3. After ARIN delegated statistics 2019-01-26 (produced 2019-01-26T06:00:17+00:00), after the report: assigned (dated 2019-01-25) source · retrieved
Classification history for this change (4 versions)
  1. : Change to ARIN's own pool record, strong inference (classifier 1.3.0)
  2. : Change to ARIN's own pool record, strong inference (classifier 1.3.1)
  3. : Change to ARIN's own pool record, strong inference (classifier 1.3.2)
  4. : Change to ARIN's own pool record, strong inference (classifier 1.4.0) current
2018-12-18 ARIN − Remove No substantive resource change found Strong inference
ARIN-Issued
Remove 216.221.16.0-216.221.31.255
Inventory
No effect on ARIN applicant inventory

ARIN-Issued lists it as "Remove", but ARIN's statistics show the same record before and after (reserved).

Evidence (3) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2018-12-18: "Remove 216.221.16.0-216.221.31.255" source · retrieved
  2. Before ARIN delegated statistics 2018-12-17 (produced 2018-12-17T06:00:13+00:00), before the report: reserved source · retrieved
  3. After ARIN delegated statistics 2018-12-19 (produced 2018-12-19T06:00:13+00:00), after the report: reserved source · retrieved
Classification history for this change (4 versions)
  1. : No substantive resource change found, strong inference (classifier 1.3.0)
  2. : No substantive resource change found, strong inference (classifier 1.3.1)
  3. : No substantive resource change found, strong inference (classifier 1.3.2)
  4. : No substantive resource change found, strong inference (classifier 1.4.0) current
2015-06-09 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 2015-08-08. 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 assigned (dated 2004-01-30) on 2015-06-08 and reserved on 2015-06-10. 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 2015-08-08. 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: 216.221.16.0/20 assigned on 2015-06-09, reserved on 2015-06-10 source · retrieved
  2. Before ARIN delegated statistics 2015-06-08 (produced 2015-06-08T05:04:45+00:00), before the report: assigned (dated 2004-01-30) source · retrieved
  3. After ARIN delegated statistics 2015-06-10 (produced 2015-06-10T05:04:31+00:00), after the report: reserved 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 (3)

Date (UTC)LogTypeRange movedFromTo
ARINMerger acquisition216.221.16.0/20 Avago Technologies U.S. Inc. ARINArista Networks, Inc. ARIN
ARINMerger acquisition216.221.16.0/20 VMWare, LLC ARINAvago Technologies U.S. Inc. ARIN
ARINMerger acquisition216.221.16.0/20 Pivotal Software, Inc. ARINVMWare, Inc. 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.

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