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.
2011-08-03RIPE NCC+ RegisteredApparent new issuanceObserved only
Statistics
31.135.224.0/20 available on 2011-08-02, assigned on 2011-08-03
Inventory
Likely issued from RIPE NCC-controlled inventory
No transfer record matches. The RIPE NCC's statistics show it available on 2011-08-02 and assigned (dated 2011-08-03) on 2011-08-03. It moved from the RIPE NCC's unissued pool to an active registration dated around that day, so it appears to be newly issued by the RIPE NCC. Another change to this range was reported the day before or after (2011-08-02: Released 31.135.224.0/20), so the before-and-after statistics may include it.
Evidence (3) · classifier 1.4.0,
StatisticsFound by comparing the RIPE NCC's daily statistics: 31.135.224.0/20 available on 2011-08-02, assigned on 2011-08-03source · retrieved
BeforeRIPE NCC delegated statistics 2011-08-02 (produced 2011-08-02T21:59:59+00:00), before the change: availablesource · retrieved
AfterRIPE NCC delegated statistics 2011-08-03 (produced 2011-08-03T21:59:59+00:00), after the change: assigned (dated 2011-08-03)source · retrieved
Classification history for this change (4 versions)
: Apparent reissuance of previously removed resource, observed only (classifier 1.3.0)
: Apparent reissuance of previously removed resource, observed only (classifier 1.3.1)
: Apparent reissuance of previously removed resource, observed only (classifier 1.3.2)
: Apparent new issuance, observed only (classifier 1.4.0) current
2011-08-02RIPE NCCReleasedReleased from hold (the RIPE NCC lists it as 'available')Observed only
Statistics
31.135.224.0/20 reserved on 2011-08-01, available on 2011-08-02
Inventory
The RIPE NCC's statistics now list it as 'available'; reissue not confirmed
The RIPE NCC's statistics show it reserved on 2011-08-01 and available on 2011-08-02. The RIPE NCC moved it from its reserved (held) records to the status it calls 'available'. That is the RIPE NCC's own label: whether and when it is reissued is not confirmed. Another change to this range was reported the day before or after (2011-08-03: Added 31.135.224.0/20), so the before-and-after statistics may include it.
Evidence (3) · classifier 1.4.0,
StatisticsFound by comparing the RIPE NCC's daily statistics: 31.135.224.0/20 reserved on 2011-08-01, available on 2011-08-02source · retrieved
BeforeRIPE NCC delegated statistics 2011-08-01 (produced 2011-08-01T21:59:59+00:00), before the change: reservedsource · retrieved
AfterRIPE NCC delegated statistics 2011-08-02 (produced 2011-08-02T21:59:59+00:00), after the change: availablesource · retrieved
Classification history for this change (4 versions)
: Released from hold (the RIPE NCC lists it as 'available'), observed only (classifier 1.3.0)
: Released from hold (the RIPE NCC lists it as 'available'), observed only (classifier 1.3.1)
: Released from hold (the RIPE NCC lists it as 'available'), observed only (classifier 1.3.2)
: Released from hold (the RIPE NCC lists it as 'available'), observed only (classifier 1.4.0) current
Transfer records
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.