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.
2025-09-18APNIC+ RegisteredRestored to the same holderObserved only
Statistics
AS10121 available on 2025-09-18, allocated on 2025-09-19
Inventory
No effect on APNIC applicant inventory
No transfer record matches. APNIC's statistics show it available on 2025-09-18 and allocated (dated 2016-08-26) on 2025-09-19. The tracker saw it removed from registration on 2025-09-17 (1 days earlier), and it is back with the same holder record it had before, so it went back to its previous holder rather than to a new one: most likely a suspension lifted, a reinstatement or a correction. Another change to this range was reported the day before or after (2025-09-17: Removed AS10121), so the before-and-after statistics may include it.
Evidence (3) · classifier 1.4.0,
StatisticsFound by comparing APNIC's daily statistics: AS10121 available on 2025-09-18, allocated on 2025-09-19source · retrieved
BeforeAPNIC delegated statistics 2025-09-18, before the change: availablesource · retrieved
AfterAPNIC delegated statistics 2025-09-19, after the change: allocated (dated 2016-08-26)source · retrieved
Classification history for this change (4 versions)
: Restored to the same holder, observed only (classifier 1.3.0)
: Restored to the same holder, observed only (classifier 1.3.1)
: Restored to the same holder, observed only (classifier 1.3.2)
: Restored to the same holder, observed only (classifier 1.4.0) current
2025-09-17APNIC− DeregisteredRemoved (return, revocation or reclamation not publicly distinguishable)Observed only
Statistics
AS10121 allocated on 2025-09-17, available on 2025-09-18
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2026-09-17. 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 2016-08-26) on 2025-09-17 and available on 2025-09-18. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no hold period, but its statistics have released returned ASNs a year after the removal or later since 2014, so the tracker estimates the hold ends on 2026-09-17. That is what APNIC has done, not a rule it states. This does not confirm availability. Another change to this range was reported the day before or after (2025-09-18: Added AS10121), so the before-and-after statistics may include it.
Evidence (3) · classifier 1.4.0,
StatisticsFound by comparing APNIC's daily statistics: AS10121 allocated on 2025-09-17, available on 2025-09-18source · retrieved
BeforeAPNIC delegated statistics 2025-09-17, before the change: allocated (dated 2016-08-26)source · retrieved
AfterAPNIC delegated statistics 2025-09-18, after the change: availablesource · retrieved
Classification history for this change (4 versions)
: Removed (return, revocation or reclamation not publicly distinguishable), observed only (classifier 1.3.0)
: Removed (return, revocation or reclamation not publicly distinguishable), observed only (classifier 1.3.1)
: Removed (return, revocation or reclamation not publicly distinguishable), observed only (classifier 1.3.2)
: Removed (return, revocation or reclamation not publicly distinguishable), observed only (classifier 1.4.0) current
2016-08-26APNIC+ RegisteredApparent reissuance of previously removed resourceStrong inference
Statistics
AS10121 available on 2016-08-26, allocated on 2016-08-27
Inventory
Likely issued from APNIC-controlled inventory
No transfer record matches. APNIC's statistics show it available on 2016-08-26 and allocated (dated 2016-08-26) on 2016-08-27. The tracker saw this range removed from registration on 2012-11-15 (AS10121), 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: AS10121 available on 2016-08-26, allocated on 2016-08-27source · retrieved
BeforeAPNIC delegated statistics 2016-08-26, before the change: availablesource · retrieved
AfterAPNIC delegated statistics 2016-08-27, after the change: allocated (dated 2016-08-26)source · retrieved
Classification history for this change (4 versions)
: Apparent reissuance of previously removed resource, strong inference (classifier 1.4.0) current
2012-11-15APNIC− DeregisteredRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Statistics
AS10121 allocated on 2012-11-15, available on 2012-11-16
Inventory
Possible future reissue candidate after hold
Removed from active registration. The tracker found it by comparing APNIC's daily statistics. APNIC's statistics show it allocated (dated 2007-11-22) on 2012-11-15 and available on 2012-11-16. Public sources do not distinguish a voluntary return, revocation, or reclamation. APNIC publishes no hold period, and its statistics show a steady one (a year) only for removals from 2014-07-01 on; this one came earlier, so the tracker gives no estimate. This does not confirm availability.
Evidence (3) · classifier 1.4.0,
StatisticsFound by comparing APNIC's daily statistics: AS10121 allocated on 2012-11-15, available on 2012-11-16source · retrieved
BeforeAPNIC delegated statistics 2012-11-15, before the change: allocated (dated 2007-11-22)source · retrieved
AfterAPNIC delegated statistics 2012-11-16, after the change: availablesource · 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 ASN.
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.