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.
2023-12-04APNIC+ RegisteredUnresolved changeObserved only
Statistics
203.31.121.0/24 reserved on 2023-12-04, assigned on 2023-12-05
Inventory
Inventory effect unknown
No transfer record matches. APNIC's statistics show it reserved on 2023-12-04 and assigned (dated 1996-09-19) on 2023-12-05. The new registration isn't dated near that day, so the tracker can't tell whether this is a new issuance.
Evidence (3) · classifier 1.4.0,
StatisticsFound by comparing APNIC's daily statistics: 203.31.121.0/24 reserved on 2023-12-04, assigned on 2023-12-05source · retrieved
BeforeAPNIC delegated statistics 2023-12-04, before the change: reservedsource · retrieved
AfterAPNIC delegated statistics 2023-12-05, after the change: assigned (dated 1996-09-19)source · 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
2023-08-21APNIC− DeregisteredRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Statistics
203.31.121.0/24 assigned on 2023-08-21, reserved on 2023-08-22
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2024-08-21. 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 assigned (dated 1996-09-19) on 2023-08-21 and reserved on 2023-08-22. 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 2024-08-21. 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: 203.31.121.0/24 assigned on 2023-08-21, reserved on 2023-08-22source · retrieved
BeforeAPNIC delegated statistics 2023-08-21, before the change: assigned (dated 1996-09-19)source · retrieved
AfterAPNIC delegated statistics 2023-08-22, 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
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.