rirtracker

IPv4 range · 65,536 addresses

66.171.0.0/16

Now

ARIN statistics
Allocated (21 records, dated 2011-01-24 to 2026-10-01) (CA, US), in the latest file
Registry
ARIN
Holder
Not looked up
From
ARIN's latest statistics

Latest change

− Remove Unresolved change

Reported
2011-01-20 (ARIN)
Confidence
Observed only
Inventory
Inventory effect unknown

Timeline (2)

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.

2011-01-20 ARIN − Remove Unresolved change Observed only
ARIN-Issued
Remove 66.171.0.0-66.171.255.255
Inventory
Inventory effect unknown

ARIN-Issued says "Remove", but ARIN's statistics show it not issued on 2011-01-19 and not issued on 2011-01-21. (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 2011-01-20: "Remove 66.171.0.0-66.171.255.255" source · retrieved
  2. Before ARIN delegated statistics 2011-01-19, before the report: not issued source · retrieved
  3. After ARIN delegated statistics 2011-01-21, after the report: not issued 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
2010-07-21 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 2010-09-19. 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 2001-09-19) on 2010-07-20 and not issued on 2010-07-22. (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 2010-09-19. 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: 66.171.0.0/16 allocated on 2010-07-21, not listed on 2010-07-22 source · retrieved
  2. Before ARIN delegated statistics 2010-07-20, before the report: allocated (dated 2001-09-19) source · retrieved
  3. After ARIN delegated statistics 2010-07-22, 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

Changes to overlapping ranges

DateRegistryRangeRecorded asWhat happened
2026-10-01ARIN66.171.38.0/24+ AddIntra-ARIN transfer
2026-06-17ARIN66.171.36.0/23Transfer logIntra-ARIN transfer
2026-05-28ARIN66.171.39.0/24+ AddIntra-ARIN transfer
2026-04-28ARIN66.171.34.0/23+ AddIntra-ARIN transfer
2026-03-09ARIN66.171.64.0/20Transfer logMerger/acquisition
2025-05-07ARIN66.171.224.0/20Transfer logMerger/acquisition
2024-05-08ARIN66.171.32.0/21Transfer logMerger/acquisition
2024-04-26ARIN66.171.240.0/20Transfer logMerger/acquisition
2023-01-23ARIN66.171.192.0/20Transfer logMerger/acquisition
2022-09-15ARIN66.171.64.0/20Transfer logMerger/acquisition
2021-11-23ARIN66.171.32.0/21Not in ARIN-IssuedRemoved
2021-09-14ARIN66.171.48.0/20Transfer logMerger/acquisition
2020-12-30ARIN66.171.96.0/20Transfer logMerger/acquisition
2020-05-28ARIN66.171.80.0/20Transfer logMerger/acquisition
2020-05-20ARIN66.171.160.0/20Transfer logMerger/acquisition
2019-12-05ARIN66.171.40.0/21+ AddIntra-ARIN transfer
2018-11-29ARIN66.171.192.0/20Transfer logMerger/acquisition
2018-03-14ARIN66.171.64.0/20Transfer logMerger/acquisition
2017-07-26ARIN66.171.224.0/20Transfer logMerger/acquisition
2016-02-12ARIN66.171.32.0/21+ AddIntra-ARIN transfer
2013-04-10ARIN66.171.32.0/20+ AddApparent reissuance
2013-03-26ARIN66.171.32.0/20− RemoveHold released
2011-08-26ARIN66.171.0.0/20+ AddApparent reissuance
2011-03-17ARIN66.171.32.0/20Not in ARIN-IssuedRemoved
2011-02-02ARIN66.171.240.0/20+ AddApparent reissuance
2011-02-01ARIN66.171.192.0/20+ AddApparent reissuance
2011-02-01ARIN66.171.208.0/20+ AddApparent reissuance
2011-02-01ARIN66.171.224.0/20+ AddApparent reissuance
2011-01-31ARIN66.171.160.0/20+ AddApparent reissuance
2011-01-31ARIN66.171.176.0/20+ AddApparent reissuance
2011-01-28ARIN66.171.128.0/20+ AddApparent reissuance
2011-01-28ARIN66.171.144.0/20+ AddApparent reissuance
2011-01-27ARIN66.171.112.0/20+ AddApparent reissuance
2011-01-26ARIN66.171.48.0/20+ AddApparent reissuance
2011-01-26ARIN66.171.64.0/20+ AddApparent reissuance
2011-01-26ARIN66.171.80.0/20+ AddApparent reissuance
2011-01-24ARIN66.171.16.0/20+ AddApparent reissuance
2011-01-24ARIN66.171.32.0/20+ AddApparent reissuance

Transfer records (19)

Date (UTC)LogTypeRange movedFromTo
ARINResource transfer66.171.38.0/24 DOJ-USMS ARINFITNESS INTERNATIONAL ARIN
ARINResource transfer66.171.36.0/23 DOJ-USMS ARINPathfinder Internet ARIN
ARINResource transfer66.171.39.0/24 DOJ-USMS ARINRed Dot Corporation ARIN
ARINResource transfer66.171.34.0/23 DOJ-USMS ARINGrid Communications ARIN
ARINMerger acquisition66.171.64.0/20 Ricoh USA, Inc. ARINNetrix LLC ARIN
ARINMerger acquisition66.171.224.0/20 GTT ARINGTT Americas, LLC ARIN
ARINMerger acquisition66.171.32.0/21 Micfo, LLC. ARINU.S. Marshals Service in accordance with the Final Order of Forfeiture ARIN
ARINMerger acquisition66.171.240.0/20 Alchemy Communications, Inc. ARINDynascale Technologies, Inc. ARIN
ARINMerger acquisition66.171.192.0/20 Internap Holding LLC ARINUnitas Global ARIN
ARINMerger acquisition66.171.64.0/20 MINDSHIFT TECHNOLOGIES ARINRicoh USA, Inc. ARIN
ARINMerger acquisition66.171.48.0/20 Dery Telecom Inc. ARINCogeco Connexion inc ARIN
ARINMerger acquisition66.171.96.0/20 Mascon Cable Systems ARINTELUS Communications Inc. ARIN
ARINMerger acquisition66.171.80.0/20 BRISTOL VIRGINIA UTILITIES ARINPoint Broadband Fiber Holding, LLC ARIN
ARINMerger acquisition66.171.160.0/20 Openface Inc. ARINBeanfield Technologies Inc. ARIN
ARINResource transfer66.171.40.0/21 Netstream Communications, LLC ARINPaul Bunyan Communications ARIN
ARINMerger acquisition66.171.192.0/20 Internap Network Services Corporation ARINInternap Corporation ARIN
ARINMerger acquisition66.171.64.0/20 Invision.com, Inc. ARINMINDSHIFT TECHNOLOGIES ARIN
ARINMerger acquisition66.171.224.0/20 nLayer Communications, Inc. ARINGTT ARIN
ARINResource transfer66.171.32.0/21 Netstream Communications, LLC ARINMicfo, 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/66.171.0.0-66.171.255.255.json