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's transfer log records a transfer from E.I. du Pont de Nemours and Co., Inc. (ARIN) to Cambridge Investment Research, Inc. (ARIN) on 2021-04-05 20:41 UTC. ARIN-Issued lists it as "Add" because the registration changed hands; it is not a new allocation from ARIN.
Evidence (4) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2021-04-05: "Add 192.153.58.0-192.153.59.255"source · retrieved
Transfer logTransfer log: RESOURCE_TRANSFER on 2021-04-05 20:41 UTC, E.I. du Pont de Nemours and Co., Inc. (ARIN) to Cambridge Investment Research, Inc. (ARIN); resources moved: 192.153.58.0/23source · retrieved
BeforeARIN delegated statistics 2021-04-04 (produced 2021-04-04T14:00:13+00:00), before the report: assigned (dated 1992-03-31)source · retrieved
AfterARIN delegated statistics 2021-04-06 (produced 2021-04-06T14:00:13+00:00), after the report: assigned (dated 2021-04-05)source · retrieved
Classification history for this change (4 versions)
: Intra-ARIN transfer, confirmed (classifier 1.4.0) current
2020-10-21ARINNot in ARIN-IssuedRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2020-12-20. 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 1992-03-31) on 2020-10-20 and available on 2020-10-22. 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 2020-12-20. This does not confirm availability.
Evidence (6) · classifier 1.4.0,
StatisticsNot listed in ARIN-Issued; found by comparing ARIN's daily statistics: 192.153.58.0/23 assigned on 2020-10-21, available on 2020-10-22source · retrieved
BeforeARIN delegated statistics 2020-10-20 (produced 2020-10-20T14:00:14+00:00), before the report: assigned (dated 1992-03-31)source · retrieved
AfterARIN delegated statistics 2020-10-22 (produced 2020-10-22T14:00:13+00:00), after the report: availablesource · retrieved
Transfer logTransfer log: RESOURCE_TRANSFER on 2020-10-19 19:18 UTC, E.I. du Pont de Nemours and Co., Inc. (ARIN) to BL Networks (ARIN); resources moved: 192.153.57.0/24source · retrieved
Transfer logTransfer log: RESOURCE_TRANSFER on 2020-10-21 19:27 UTC, E.I. du Pont de Nemours and Co., Inc. (ARIN) to Joe Wheeler EMC (ARIN); resources moved: 192.153.72.0/22source · retrieved
Transfer logTransfer log: RESOURCE_TRANSFER on 2020-10-23 20:14 UTC, E.I. du Pont de Nemours and Co., Inc. (ARIN) to OCULUS SOLUTIONS LLC (ARIN); resources moved: 192.153.64.0/21source · 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
Transfer records (1)
Date (UTC)
Log
Type
Range moved
From
To
ARIN
Resource transfer
192.153.58.0/23
E.I. du Pont de Nemours and Co., Inc. ARIN
Cambridge Investment Research, 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.