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.
2025-12-17ARIN+ AddRestored to the same holderStrong inference
ARIN-Issued
Add AS20211
Inventory
No effect on ARIN applicant inventory
No transfer record matches. ARIN's statistics show it reserved on 2025-12-16 and assigned (dated 2025-12-17) on 2025-12-18. The tracker saw it removed from registration on 2025-09-08 (100 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 2025-12-17: "Add AS20211"source · retrieved
BeforeARIN delegated statistics 2025-12-16 (produced 2025-12-16T14:00:46+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2025-12-18 (produced 2025-12-18T14:00:47+00:00), after the report: assigned (dated 2025-12-17)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
2025-12-17ARIN− RemoveChange to ARIN's own pool recordStrong inference
ARIN-Issued
Remove AS20211
Inventory
Part of the issuance reported the same day
ARIN's statistics show it reserved on 2025-12-16 and assigned (dated 2025-12-17) on 2025-12-18. ARIN removed its own pool record for this range as part of issuing it: the same report adds AS20211. The issuance is explained on that line.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2025-12-17: "Remove AS20211"source · retrieved
BeforeARIN delegated statistics 2025-12-16 (produced 2025-12-16T14:00:46+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2025-12-18 (produced 2025-12-18T14:00:47+00:00), after the report: assigned (dated 2025-12-17)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
2025-09-08ARINNot in ARIN-IssuedRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2026-03-08. 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 2001-04-06) on 2025-09-07 and reserved on 2025-09-09. 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 2026-03-08. 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: AS20211 assigned on 2025-09-08, reserved on 2025-09-09source · retrieved
BeforeARIN delegated statistics 2025-09-07 (produced 2025-09-07T13:00:51+00:00), before the report: assigned (dated 2001-04-06)source · retrieved
AfterARIN delegated statistics 2025-09-09 (produced 2025-09-09T13:00:50+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
2020-05-06ARINTransfer logMerger/acquisition or reorganizationConfirmed
Transfer log
Merger/acquisition: Henry Wurst, Inc. (ARIN) to MITTERA GROUP, INC (ARIN)
From
Henry Wurst, Inc. ARIN
To
MITTERA GROUP, INC ARIN
Inventory
No effect on ARIN applicant inventory
ARIN's transfer log records a merger, acquisition or reorganization from Henry Wurst, Inc. (ARIN) to MITTERA GROUP, INC (ARIN) on 2020-05-06 20:56 UTC. The registration changed hands; it is not a new allocation from ARIN. ARIN-Issued and ARIN's statistics don't show this change; only the transfer log records it.
Evidence (3) · classifier 1.4.0,
Transfer logTransfer log: MERGER_ACQUISITION on 2020-05-06 20:56 UTC, Henry Wurst, Inc. (ARIN) to MITTERA GROUP, INC (ARIN); resources moved: AS20211source · retrieved
BeforeARIN delegated statistics 2020-05-05 (produced 2020-05-05T14:00:13+00:00), before the report: assigned (dated 2001-04-06)source · retrieved
AfterARIN delegated statistics 2020-05-07 (produced 2020-05-07T14:00:13+00:00), after the report: assigned (dated 2001-04-06)source · retrieved
Transfer records (1)
Date (UTC)
Log
Type
Range moved
From
To
ARIN
Merger acquisition
AS20211
Henry Wurst, Inc. ARIN
MITTERA GROUP, INC 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.