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.
2022-04-11ARIN− RemoveChange to ARIN's own pool recordObserved only
ARIN-Issued
Remove 216.146.0.0-216.146.31.255
Inventory
Part of the issuance reported the same day
ARIN's statistics show it reserved on 2022-04-10 and allocated (dated 2022-04-11), reserved on 2022-04-12. ARIN removed its own pool record for this range as part of issuing it: the same report adds 216.146.0.0-216.146.3.255, 216.146.8.0-216.146.11.255, 216.146.12.0-216.146.15.255, 216.146.16.0-216.146.19.255 and 3 more. The issuance is explained on those lines. Another change to this range was reported the day before or after (2022-04-12: Remove 216.146.4.0-216.146.7.255; 2022-04-12: Add 216.146.4.0-216.146.7.255), so the before-and-after statistics may include it.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2022-04-11: "Remove 216.146.0.0-216.146.31.255"source · retrieved
BeforeARIN delegated statistics 2022-04-10 (produced 2022-04-10T13:00:10+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2022-04-12 (produced 2022-04-12T13:00:10+00:00), after the report: allocated (dated 2022-04-11), reservedsource · retrieved
Classification history for this change (4 versions)
: Change to ARIN's own pool record, observed only (classifier 1.3.0)
: Change to ARIN's own pool record, observed only (classifier 1.3.1)
: Change to ARIN's own pool record, observed only (classifier 1.3.2)
: Change to ARIN's own pool record, observed only (classifier 1.4.0) current
2012-07-16ARINNot in ARIN-IssuedRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2012-09-14. 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 1998-12-15) on 2012-07-15 and not issued on 2012-07-17. (Until 2013-03-05, ARIN's statistics list only what's issued.) 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 2012-09-14. This does not confirm availability.
Evidence (3) · classifier 1.4.0,
StatisticsNot listed in ARIN-Issued; found by comparing ARIN's daily statistics: 216.146.0.0/19 allocated on 2012-07-16, not listed on 2012-07-17source · retrieved
BeforeARIN delegated statistics 2012-07-15, before the report: allocated (dated 1998-12-15)source · retrieved
AfterARIN delegated statistics 2012-07-17, after the report: not issuedsource · 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
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.