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.
ARIN's transfer log records a transfer from Swift & Staley Inc. (ARIN) to MSCAL (ARIN) on 2025-12-24 17:52 UTC. ARIN-Issued lists it as "Add" because the registration changed hands; it is not a new allocation from ARIN.
Evidence (4) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2025-12-24: "Add AS31850"source · retrieved
Transfer logTransfer log: RESOURCE_TRANSFER on 2025-12-24 17:52 UTC, Swift & Staley Inc. (ARIN) to MSCAL (ARIN); resources moved: AS31850source · retrieved
BeforeARIN delegated statistics 2025-12-23 (produced 2025-12-23T14:00:48+00:00), before the report: assigned (dated 2023-12-12)source · retrieved
AfterARIN delegated statistics 2025-12-25 (produced 2025-12-25T14:00:48+00:00), after the report: assigned (dated 2025-12-24)source · retrieved
Classification history for this change (4 versions)
: Intra-ARIN transfer, confirmed (classifier 1.4.0) current
2023-12-12ARIN+ AddApparent reissuance of previously removed resourceStrong inference
ARIN-Issued
Add AS31850
Inventory
Likely issued from ARIN-controlled inventory
No transfer record matches. ARIN's statistics show it available on 2023-12-11 and assigned (dated 2023-12-12) on 2023-12-13. The tracker saw this range released from hold on 2023-12-05 (AS31850), so it appears to have been issued again from ARIN's pool.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2023-12-12: "Add AS31850"source · retrieved
BeforeARIN delegated statistics 2023-12-11 (produced 2023-12-11T14:00:34+00:00), before the report: availablesource · retrieved
AfterARIN delegated statistics 2023-12-13 (produced 2023-12-13T14:00:33+00:00), after the report: assigned (dated 2023-12-12)source · retrieved
Classification history for this change (4 versions)
: Apparent reissuance of previously removed resource, strong inference (classifier 1.4.0) current
2023-12-05ARIN− RemoveReleased from hold (ARIN lists it as 'available')Strong inference
ARIN-Issued
Remove AS31850
Inventory
ARIN's statistics now list it as 'available'; reissue not confirmed
ARIN's statistics show it reserved on 2023-12-04 and available on 2023-12-06. ARIN took it out of its reserved (held) records; its statistics now give it the status 'available'. The tracker saw it removed from registration on 2023-01-09, 330 days earlier. That is ARIN's own label: whether and when it is reissued is not confirmed.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2023-12-05: "Remove AS31850"source · retrieved
BeforeARIN delegated statistics 2023-12-04 (produced 2023-12-04T14:00:34+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2023-12-06 (produced 2023-12-06T14:00:33+00:00), after the report: availablesource · retrieved
Classification history for this change (4 versions)
: Released from hold (ARIN lists it as 'available'), strong inference (classifier 1.3.0)
: Released from hold (ARIN lists it as 'available'), strong inference (classifier 1.3.1)
: Released from hold (ARIN lists it as 'available'), strong inference (classifier 1.3.2)
: Released from hold (ARIN lists it as 'available'), strong inference (classifier 1.4.0) current
2023-01-09ARINNot in ARIN-IssuedRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2023-07-09. 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 2004-01-09) on 2023-01-08 and reserved on 2023-01-10. 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 2023-07-09. This does not confirm availability.
Evidence (3) · classifier 1.4.0,
StatisticsNot listed in ARIN-Issued; found by comparing ARIN's daily statistics: AS31850 assigned on 2023-01-09, reserved on 2023-01-10source · retrieved
BeforeARIN delegated statistics 2023-01-08 (produced 2023-01-08T14:00:11+00:00), before the report: assigned (dated 2004-01-09)source · retrieved
AfterARIN delegated statistics 2023-01-10 (produced 2023-01-10T14:00:11+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
Transfer records (1)
Date (UTC)
Log
Type
Range moved
From
To
ARIN
Resource transfer
AS31850
Swift & Staley Inc. ARIN
MSCAL ARIN
Every record in the ARIN, RIPE NCC, APNIC, LACNIC and AFRINIC transfer logs that moved any part of this ASN (ARIN's from 2009, the RIPE NCC's from 2012, APNIC's from 2010, LACNIC's from 2016, AFRINIC's from 2018). A transfer between two registries is in both logs.
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.