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.
2025-07-01ARIN+ AddApparent reissuance of previously removed resourceStrong inference
ARIN-Issued
Add 104.192.72.0-104.192.72.255
Inventory
Likely issued from ARIN-controlled inventory
No transfer record matches. ARIN's statistics show it reserved on 2025-06-30 and allocated (dated 2025-07-01) on 2025-07-02. The tracker saw this range removed from registration on 2020-07-06 (104.192.72.0/24), so it appears to have been issued again from ARIN's pool.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2025-07-01: "Add 104.192.72.0-104.192.72.255"source · retrieved
BeforeARIN delegated statistics 2025-06-30 (produced 2025-06-30T13:01:12+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2025-07-02 (produced 2025-07-02T13:01:11+00:00), after the report: allocated (dated 2025-07-01)source · retrieved
Classification history for this change (4 versions)
: Apparent reissuance of previously removed resource, strong inference (classifier 1.4.0) current
2025-07-01ARIN− RemoveChange to ARIN's own pool recordStrong inference
ARIN-Issued
Remove 104.192.72.0-104.192.72.255
Inventory
Part of the issuance reported the same day
ARIN's statistics show it reserved on 2025-06-30 and allocated (dated 2025-07-01) on 2025-07-02. ARIN removed its own pool record for this range as part of issuing it: the same report adds 104.192.72.0-104.192.72.255. The issuance is explained on that line.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2025-07-01: "Remove 104.192.72.0-104.192.72.255"source · retrieved
BeforeARIN delegated statistics 2025-06-30 (produced 2025-06-30T13:01:12+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2025-07-02 (produced 2025-07-02T13:01:11+00:00), after the report: allocated (dated 2025-07-01)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
2020-07-06ARINNot in ARIN-IssuedRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2020-09-04. 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 2017-02-10) on 2020-07-05 and reserved on 2020-07-07. Public sources do not distinguish a voluntary return, revocation, or reclamation. ARIN holds returned, revoked and reclaimed IPv4 space for 60 days before reissuing it, so the estimated hold end is 2020-09-04. This does not confirm availability.
Evidence (3) · classifier 1.4.0,
StatisticsNot listed in ARIN-Issued; found by comparing ARIN's daily statistics: 104.192.72.0/24 assigned on 2020-07-06, reserved on 2020-07-07source · retrieved
BeforeARIN delegated statistics 2020-07-05 (produced 2020-07-05T14:00:13+00:00), before the report: assigned (dated 2017-02-10)source · retrieved
AfterARIN delegated statistics 2020-07-07 (produced 2020-07-07T14:00:13+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
104.192.72.0/22: the rest of the block stayed with the seller
Inventory
No effect on ARIN applicant inventory
ARIN's transfer log records a transfer from Aqueous Networks LLC (ARIN) to National Cybersecurity Center (ARIN) on 2017-02-10 20:04 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 2017-02-10: "Add 104.192.72.0-104.192.72.255"source · retrieved
Transfer logTransfer log: RESOURCE_TRANSFER on 2017-02-10 20:04 UTC, Aqueous Networks LLC (ARIN) to National Cybersecurity Center (ARIN); resources moved: 104.192.72.0/24source · retrieved
BeforeARIN delegated statistics 2017-02-09 (produced 2017-02-09T06:09:01+00:00), before the report: allocated (dated 2014-08-27)source · retrieved
AfterARIN delegated statistics 2017-02-11 (produced 2017-02-11T06:10:25+00:00), after the report: assigned (dated 2017-02-10)source · retrieved
Classification history for this change (4 versions)
Every record in the ARIN, RIPE NCC, APNIC, LACNIC and AFRINIC transfer logs that moved any part of this IPv4 range (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.