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.
2018-11-14APNIC+ RegisteredApparent reissuance of previously removed resourceStrong inference
Statistics
202.181.4.0/22 available on 2018-11-14, allocated on 2018-11-15
Inventory
Likely issued from APNIC-controlled inventory
No transfer record matches. APNIC's statistics show it available on 2018-11-14 and allocated (dated 2018-11-13) on 2018-11-15. The tracker saw this range released from hold on 2018-10-31 (202.181.4.0/22), so it appears to have been issued again from APNIC's pool.
Evidence (3) · classifier 1.4.0,
StatisticsFound by comparing APNIC's daily statistics: 202.181.4.0/22 available on 2018-11-14, allocated on 2018-11-15source · retrieved
BeforeAPNIC delegated statistics 2018-11-14, before the change: availablesource · retrieved
AfterAPNIC delegated statistics 2018-11-15, after the change: allocated (dated 2018-11-13)source · retrieved
Classification history for this change (4 versions)
: Apparent reissuance of previously removed resource, strong inference (classifier 1.4.0) current
2018-10-31APNICReleasedReleased from hold (APNIC lists it as 'available')Strong inference
Statistics
202.181.4.0/22 reserved on 2018-10-31, available on 2018-11-01
Inventory
APNIC's statistics now list it as 'available'; reissue not confirmed
APNIC's statistics show it reserved on 2018-10-31 and available on 2018-11-01. APNIC moved it from its reserved (held) records to the status it calls 'available'. The tracker saw it removed from registration on 2017-02-06, 632 days earlier. That is APNIC's own label: whether and when it is reissued is not confirmed.
Evidence (3) · classifier 1.4.0,
StatisticsFound by comparing APNIC's daily statistics: 202.181.4.0/22 reserved on 2018-10-31, available on 2018-11-01source · retrieved
BeforeAPNIC delegated statistics 2018-10-31, before the change: reservedsource · retrieved
AfterAPNIC delegated statistics 2018-11-01, after the change: availablesource · retrieved
Classification history for this change (4 versions)
: Released from hold (APNIC lists it as 'available'), strong inference (classifier 1.3.0)
: Released from hold (APNIC lists it as 'available'), strong inference (classifier 1.3.1)
: Released from hold (APNIC lists it as 'available'), strong inference (classifier 1.3.2)
: Released from hold (APNIC lists it as 'available'), strong inference (classifier 1.4.0) current
2017-02-06APNIC− DeregisteredRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Statistics
202.181.4.0/22 allocated on 2017-02-06, reserved on 2017-02-07
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2018-02-06. Possible reissue candidate after this date; not confirmed available.
Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 2015-12-17) on 2017-02-06 and reserved on 2017-02-07. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no hold period, but its statistics have released returned IPv4 space a year after the removal or later since 2014, so the tracker estimates the hold ends on 2018-02-06. That is what APNIC has done, not a rule it states. This does not confirm availability.
Evidence (3) · classifier 1.4.0,
StatisticsFound by comparing APNIC's daily statistics: 202.181.4.0/22 allocated on 2017-02-06, reserved on 2017-02-07source · retrieved
BeforeAPNIC delegated statistics 2017-02-06, before the change: allocated (dated 2015-12-17)source · retrieved
AfterAPNIC delegated statistics 2017-02-07, after the change: reservedsource · 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
2015-12-17APNIC+ RegisteredApparent reissuance of previously removed resourceStrong inference
Statistics
202.181.4.0/22 available on 2015-12-17, allocated on 2015-12-18
Inventory
Likely issued from APNIC-controlled inventory
No transfer record matches. APNIC's statistics show it available on 2015-12-17 and allocated (dated 2015-12-17) on 2015-12-18. The tracker saw this range released from hold on 2015-10-28 (202.181.0.0/19), so it appears to have been issued again from APNIC's pool.
Evidence (3) · classifier 1.4.0,
StatisticsFound by comparing APNIC's daily statistics: 202.181.4.0/22 available on 2015-12-17, allocated on 2015-12-18source · retrieved
BeforeAPNIC delegated statistics 2015-12-17, before the change: availablesource · retrieved
AfterAPNIC delegated statistics 2015-12-18, after the change: allocated (dated 2015-12-17)source · retrieved
Classification history for this change (4 versions)
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.