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.
ARIN-Issued lists it as "Remove", but ARIN's statistics show the same record before and after (reserved).
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2025-12-22: "Remove 23.164.128.0-23.164.128.255"source · retrieved
BeforeARIN delegated statistics 2025-12-21 (produced 2025-12-21T14:00:47+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2025-12-23 (produced 2025-12-23T14:00:48+00:00), after the report: reservedsource · retrieved
Classification history for this change (4 versions)
: No substantive resource change found, strong inference (classifier 1.3.0)
: No substantive resource change found, strong inference (classifier 1.3.1)
: No substantive resource change found, strong inference (classifier 1.3.2)
: No substantive resource change found, strong inference (classifier 1.4.0) current
2018-06-19ARINNot in ARIN-IssuedRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2018-08-18. 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 2017-11-30) on 2018-06-18 and reserved on 2018-06-20. 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 2018-08-18. This does not confirm availability.
Evidence (3) · classifier 1.4.0,
StatisticsNot listed in ARIN-Issued; found by comparing ARIN's daily statistics: 23.164.128.0/24 allocated on 2018-06-19, reserved on 2018-06-20source · retrieved
BeforeARIN delegated statistics 2018-06-18 (produced 2018-06-18T05:00:23+00:00), before the report: allocated (dated 2017-11-30)source · retrieved
AfterARIN delegated statistics 2018-06-20 (produced 2018-06-20T05:00:23+00:00), after the report: reservedsource · 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
2017-11-30ARIN+ AddRestored to the same holderStrong inference
ARIN-Issued
Add 23.164.128.0-23.164.128.255
Inventory
No effect on ARIN applicant inventory
No transfer record matches. ARIN's statistics show it reserved on 2017-11-29 and allocated (dated 2017-11-30) on 2017-12-01. The tracker saw it removed from registration on 2017-10-19 (42 days earlier), and it is back with the same holder record it had before, so it went back to its previous holder rather than to a new one: most likely a suspension lifted, a reinstatement or a correction.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2017-11-30: "Add 23.164.128.0-23.164.128.255"source · retrieved
BeforeARIN delegated statistics 2017-11-29 (produced 2017-11-29T06:08:19+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2017-12-01 (produced 2017-12-01T06:08:35+00:00), after the report: allocated (dated 2017-11-30)source · retrieved
Classification history for this change (4 versions)
: Restored to the same holder, strong inference (classifier 1.3.0)
: Restored to the same holder, strong inference (classifier 1.3.1)
: Restored to the same holder, strong inference (classifier 1.3.2)
: Restored to the same holder, strong inference (classifier 1.4.0) current
2017-11-30ARIN− RemoveChange to ARIN's own pool recordStrong inference
ARIN-Issued
Remove 23.164.128.0-23.164.128.255
Inventory
Part of the issuance reported the same day
ARIN's statistics show it reserved on 2017-11-29 and allocated (dated 2017-11-30) on 2017-12-01. ARIN removed its own pool record for this range as part of issuing it: the same report adds 23.164.128.0-23.164.128.255. The issuance is explained on that line.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2017-11-30: "Remove 23.164.128.0-23.164.128.255"source · retrieved
BeforeARIN delegated statistics 2017-11-29 (produced 2017-11-29T06:08:19+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2017-12-01 (produced 2017-12-01T06:08:35+00:00), after the report: allocated (dated 2017-11-30)source · retrieved
Classification history for this change (4 versions)
: Change to ARIN's own pool record, strong inference (classifier 1.3.0)
: Change to ARIN's own pool record, strong inference (classifier 1.3.1)
: Change to ARIN's own pool record, strong inference (classifier 1.3.2)
: Change to ARIN's own pool record, strong inference (classifier 1.4.0) current
2017-10-19ARINNot in ARIN-IssuedRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2017-12-18. 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 2017-05-03) on 2017-10-18 and reserved on 2017-10-20. 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 2017-12-18. This does not confirm availability.
Evidence (3) · classifier 1.4.0,
StatisticsNot listed in ARIN-Issued; found by comparing ARIN's daily statistics: 23.164.128.0/24 allocated on 2017-10-19, reserved on 2017-10-20source · retrieved
BeforeARIN delegated statistics 2017-10-18 (produced 2017-10-18T05:11:24+00:00), before the report: allocated (dated 2017-05-03)source · retrieved
AfterARIN delegated statistics 2017-10-20 (produced 2017-10-20T05:11:02+00:00), after the report: reservedsource · 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
2017-05-03ARIN+ AddApparent new issuanceStrong inference
ARIN-Issued
Add 23.164.128.0-23.164.128.255
Inventory
Likely issued from ARIN-controlled inventory
No transfer record matches. ARIN's statistics show it reserved on 2017-05-02 and allocated (dated 2017-05-03) on 2017-05-04. 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 2017-05-03: "Add 23.164.128.0-23.164.128.255"source · retrieved
BeforeARIN delegated statistics 2017-05-02 (produced 2017-05-02T05:09:07+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2017-05-04 (produced 2017-05-04T05:09:16+00:00), after the report: allocated (dated 2017-05-03)source · retrieved
Classification history for this change (4 versions)
No transfer log has a transfer of any part of this IPv4 range.
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.