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.
2016-04-19AFRINIC+ RegisteredApparent new issuanceStrong inference
Statistics
155.251.0.0/16 available on 2016-04-19, allocated on 2016-04-20
Inventory
Likely issued from AFRINIC-controlled inventory
No transfer record matches. AFRINIC's statistics show it available on 2016-04-19 and allocated (dated 2016-04-19) on 2016-04-20. It moved from AFRINIC's unissued pool to an active registration dated around that day, so it appears to be newly issued by AFRINIC.
Evidence (3) · classifier 1.4.0,
StatisticsFound by comparing AFRINIC's daily statistics: 155.251.0.0/16 available on 2016-04-19, allocated on 2016-04-20source · retrieved
BeforeAFRINIC delegated statistics 2016-04-19, before the change: availablesource · retrieved
AfterAFRINIC delegated statistics 2016-04-20, after the change: allocated (dated 2016-04-19)source · retrieved
Classification history for this change (4 versions)
: Apparent new issuance, strong inference (classifier 1.3.0)
: Apparent new issuance, strong inference (classifier 1.3.1)
: Apparent new issuance, strong inference (classifier 1.3.2)
: Apparent new issuance, strong inference (classifier 1.4.0) current
2010-06-07ARIN− RemoveUnresolved changeObserved only
ARIN-Issued
Remove 155.251.0.0-155.251.255.255
Inventory
Inventory effect unknown
ARIN-Issued says "Remove", but ARIN's statistics show it not issued on 2010-06-06 and not issued on 2010-06-08. (Until 2013-03-05, ARIN's statistics list only what's issued.) The registry's pool records from that time aren't public, so the tracker can't tell what was removed.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2010-06-07: "Remove 155.251.0.0-155.251.255.255"source · retrieved
BeforeARIN delegated statistics 2010-06-06, before the report: not issuedsource · retrieved
AfterARIN delegated statistics 2010-06-08, after the report: not issuedsource · 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
2009-06-04ARINNot in ARIN-IssuedRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2009-08-03. 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 1991-12-11) on 2009-06-03 and not issued on 2009-06-05. (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 2009-08-03. This does not confirm availability.
Evidence (3) · classifier 1.4.0,
StatisticsNot listed in ARIN-Issued; found by comparing ARIN's daily statistics: 155.251.0.0/16 assigned on 2009-06-04, not listed on 2009-06-05source · retrieved
BeforeARIN delegated statistics 2009-06-03, before the report: assigned (dated 1991-12-11)source · retrieved
AfterARIN delegated statistics 2009-06-05, 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
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.