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 Ford Motor Company (ARIN) to MARKETO (ARIN), recorded as 2 transfer records that together cover exactly this range, on 2014-02-27 23:29 UTC. ARIN-Issued lists it as "Add" because the registration changed hands; it is not a new allocation from ARIN.
Evidence (5) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2014-02-27: "Add 192.28.144.0-192.28.191.255"source · retrieved
Transfer logTransfer log: RESOURCE_TRANSFER on 2014-02-27 23:29 UTC, Ford Motor Company (ARIN) to MARKETO (ARIN); resources moved: 192.28.144.0/20source · retrieved
Transfer logTransfer log: RESOURCE_TRANSFER on 2014-02-27 23:29 UTC, Ford Motor Company (ARIN) to MARKETO (ARIN); resources moved: 192.28.160.0/19source · retrieved
BeforeARIN delegated statistics 2014-02-26 (produced 2014-02-26T06:05:26+00:00), before the report: assigned (dated 1988-02-16)source · retrieved
AfterARIN delegated statistics 2014-02-28 (produced 2014-02-28T06:07:12+00:00), after the report: allocated (dated 2014-02-27)source · retrieved
Classification history for this change (4 versions)
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.