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 Northern Telecom Canada Ltd. (ARIN) to Charter Communications (ARIN), recorded as 4 transfer records that together cover exactly this range, on 2017-11-27 15:06 UTC. ARIN-Issued lists it as "Add" because the registration changed hands; it is not a new allocation from ARIN.
Evidence (7) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2017-11-27: "Add 131.150.160.0-131.150.189.255"source · retrieved
Transfer logTransfer log: RESOURCE_TRANSFER on 2017-11-27 15:06 UTC, Northern Telecom Canada Ltd. (ARIN) to Charter Communications (ARIN); resources moved: 131.150.160.0/20source · retrieved
Transfer logTransfer log: RESOURCE_TRANSFER on 2017-11-27 15:06 UTC, Northern Telecom Canada Ltd. (ARIN) to Charter Communications (ARIN); resources moved: 131.150.184.0/22source · retrieved
Transfer logTransfer log: RESOURCE_TRANSFER on 2017-11-27 15:06 UTC, Northern Telecom Canada Ltd. (ARIN) to Charter Communications (ARIN); resources moved: 131.150.188.0/23source · retrieved
Transfer logTransfer log: RESOURCE_TRANSFER on 2017-11-27 15:06 UTC, Northern Telecom Canada Ltd. (ARIN) to Charter Communications (ARIN); resources moved: 131.150.176.0/21source · retrieved
BeforeARIN delegated statistics 2017-11-26 (produced 2017-11-26T06:08:28+00:00), before the report: assigned (dated 1988-01-25)source · retrieved
AfterARIN delegated statistics 2017-11-28 (produced 2017-11-28T06:09:49+00:00), after the report: allocated (dated 2017-11-27)source · retrieved
Classification history for this change (4 versions)
No transfer record matches. ARIN's statistics show it assigned (dated 1988-11-23) on 2012-05-14 and assigned (dated 2012-05-15) on 2012-05-16. (Until 2013-03-05, ARIN's statistics list only what's issued.) The registration was replaced with one for a different holder record, and public sources don't say why (a transfer not yet logged, a return and reissue, or an organization record change).
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2012-05-15: "Add 131.150.160.0-131.150.189.255"source · retrieved
BeforeARIN delegated statistics 2012-05-14, before the report: assigned (dated 1988-11-23)source · retrieved
AfterARIN delegated statistics 2012-05-16, after the report: assigned (dated 2012-05-15)source · retrieved
Classification history for this change (4 versions)
: Unresolved change, observed only (classifier 1.3.0)
: Unresolved change, observed only (classifier 1.3.1)
: Unresolved change, observed only (classifier 1.3.2)
: Unresolved change, observed only (classifier 1.4.0) current
Transfer records (4)
Date (UTC)
Log
Type
Range moved
From
To
ARIN
Resource transfer
131.150.160.0/20
Northern Telecom Canada Ltd. ARIN
Charter Communications ARIN
ARIN
Resource transfer
131.150.176.0/21
Northern Telecom Canada Ltd. ARIN
Charter Communications ARIN
ARIN
Resource transfer
131.150.184.0/22
Northern Telecom Canada Ltd. ARIN
Charter Communications ARIN
ARIN
Resource transfer
131.150.188.0/23
Northern Telecom Canada Ltd. ARIN
Charter Communications 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.