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.
2014-09-24RIPE NCC+ RegisteredUnresolved changeObserved only
Statistics
193.23.121.0/24 reserved on 2014-09-23, assigned on 2014-09-24
Inventory
Inventory effect unknown
No transfer record matches. The RIPE NCC's statistics show it reserved on 2014-09-23 and assigned (dated 2004-06-29) on 2014-09-24. 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 the RIPE NCC's daily statistics: 193.23.121.0/24 reserved on 2014-09-23, assigned on 2014-09-24source · retrieved
BeforeRIPE NCC delegated statistics 2014-09-23 (produced 2014-09-23T21:59:59+00:00), before the change: reservedsource · retrieved
AfterRIPE NCC delegated statistics 2014-09-24 (produced 2014-09-24T21:59:59+00:00), after the change: assigned (dated 2004-06-29)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
2014-09-15RIPE NCC− DeregisteredRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Statistics
193.23.121.0/24 assigned on 2014-09-14, reserved on 2014-09-15
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2015-03-14. Possible reissue candidate after this date; not confirmed available.
Removed from active registration. The tracker found it by comparing the RIPE NCC's daily statistics. The RIPE NCC's statistics show it assigned (dated 2004-06-29) on 2014-09-14 and reserved on 2014-09-15. Public sources do not distinguish a voluntary return, revocation, or reclamation. The RIPE NCC holds returned, revoked and reclaimed IPv4 space for 180 days (six months), or longer while still routed, before reissuing it, so the estimated hold end is 2015-03-14. This does not confirm availability.
Evidence (3) · classifier 1.4.0,
StatisticsFound by comparing the RIPE NCC's daily statistics: 193.23.121.0/24 assigned on 2014-09-14, reserved on 2014-09-15source · retrieved
BeforeRIPE NCC delegated statistics 2014-09-14 (produced 2014-09-14T21:59:59+00:00), before the change: assigned (dated 2004-06-29)source · retrieved
AfterRIPE NCC delegated statistics 2014-09-15 (produced 2014-09-15T21:59:59+00:00), 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.