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.
2025-09-23ARIN+ AddRestored to the same holderStrong inference
ARIN-Issued
Add AS399875
Inventory
No effect on ARIN applicant inventory
No transfer record matches. ARIN's statistics show it reserved on 2025-09-22 and assigned (dated 2025-09-23) on 2025-09-24. The tracker saw it removed from registration on 2024-12-09 (288 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.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2025-09-23: "Add AS399875"source · retrieved
BeforeARIN delegated statistics 2025-09-22 (produced 2025-09-22T13:00:51+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2025-09-24 (produced 2025-09-24T13:00:51+00:00), after the report: assigned (dated 2025-09-23)source · retrieved
Classification history for this change (4 versions)
: Restored to the same holder, strong inference (classifier 1.3.0)
: Restored to the same holder, strong inference (classifier 1.3.1)
: Restored to the same holder, strong inference (classifier 1.3.2)
: Restored to the same holder, strong inference (classifier 1.4.0) current
2025-09-23ARIN− RemoveChange to ARIN's own pool recordStrong inference
ARIN-Issued
Remove AS399875
Inventory
Part of the issuance reported the same day
ARIN's statistics show it reserved on 2025-09-22 and assigned (dated 2025-09-23) on 2025-09-24. ARIN removed its own pool record for this range as part of issuing it: the same report adds AS399875. The issuance is explained on that line.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2025-09-23: "Remove AS399875"source · retrieved
BeforeARIN delegated statistics 2025-09-22 (produced 2025-09-22T13:00:51+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2025-09-24 (produced 2025-09-24T13:00:51+00:00), after the report: assigned (dated 2025-09-23)source · retrieved
Classification history for this change (4 versions)
: Change to ARIN's own pool record, strong inference (classifier 1.3.0)
: Change to ARIN's own pool record, strong inference (classifier 1.3.1)
: Change to ARIN's own pool record, strong inference (classifier 1.3.2)
: Change to ARIN's own pool record, strong inference (classifier 1.4.0) current
2024-12-09ARINNot in ARIN-IssuedRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2025-06-09. 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 2021-07-15) on 2024-12-08 and reserved on 2024-12-10. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed ASNs for 6 calendar months before reissuing them, so the estimated hold end is 2025-06-09. This does not confirm availability. Since mid-2024, ARIN has released many ASNs within two months, before the 6 calendar months were up, so the release can come sooner.
Evidence (3) · classifier 1.4.0,
StatisticsNot listed in ARIN-Issued; found by comparing ARIN's daily statistics: AS399875 assigned on 2024-12-09, reserved on 2024-12-10source · retrieved
BeforeARIN delegated statistics 2024-12-08 (produced 2024-12-08T14:01:06+00:00), before the report: assigned (dated 2021-07-15)source · retrieved
AfterARIN delegated statistics 2024-12-10 (produced 2024-12-10T14:01:06+00:00), after the report: 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
2021-07-15ARIN+ AddApparent new issuanceStrong inference
ARIN-Issued
Add AS399875
Inventory
Likely issued from ARIN-controlled inventory
No transfer record matches. ARIN's statistics show it available on 2021-07-14 and assigned (dated 2021-07-15) on 2021-07-16. It moved from ARIN's unissued pool to an active registration dated around the report, so it appears to be newly issued by ARIN.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2021-07-15: "Add AS399875"source · retrieved
BeforeARIN delegated statistics 2021-07-14 (produced 2021-07-14T14:00:13+00:00), before the report: availablesource · retrieved
AfterARIN delegated statistics 2021-07-16 (produced 2021-07-16T14:00:13+00:00), after the report: assigned (dated 2021-07-15)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
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.