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.
2022-01-06ARIN− RemoveChange to ARIN's own pool recordObserved only
ARIN-Issued
Remove 174.136.192.0-174.136.255.255
Inventory
Part of the issuance reported the same day
ARIN's statistics show it reserved on 2022-01-05 and allocated (dated 2022-01-06), available, reserved on 2022-01-07. ARIN removed its own pool record for this range as part of issuing it: the same report adds 174.136.196.0-174.136.199.255, 174.136.200.0-174.136.203.255, 174.136.204.0-174.136.207.255, 174.136.252.0-174.136.252.255 and 1 more. The issuance is explained on those lines. Another change to this range was reported the day before or after (2022-01-07: Remove 174.136.212.0-174.136.215.255; 2022-01-07: Add 174.136.212.0-174.136.215.255; 2022-01-07: Add 174.136.216.0-174.136.219.255), so the before-and-after statistics may include it.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2022-01-06: "Remove 174.136.192.0-174.136.255.255"source · retrieved
BeforeARIN delegated statistics 2022-01-05 (produced 2022-01-05T14:00:13+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2022-01-07 (produced 2022-01-07T14:00:12+00:00), after the report: allocated (dated 2022-01-06), available, reservedsource · retrieved
Classification history for this change (4 versions)
: Change to ARIN's own pool record, observed only (classifier 1.3.0)
: Change to ARIN's own pool record, observed only (classifier 1.3.1)
: Change to ARIN's own pool record, observed only (classifier 1.3.2)
: Change to ARIN's own pool record, observed only (classifier 1.4.0) current
2019-07-29ARINNot in ARIN-IssuedRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2019-09-27. 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 allocated (dated 2015-03-12) on 2019-07-28 and reserved on 2019-07-30. 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 2019-09-27. This does not confirm availability.
Evidence (3) · classifier 1.4.0,
StatisticsNot listed in ARIN-Issued; found by comparing ARIN's daily statistics: 174.136.192.0/18 allocated on 2019-07-29, reserved on 2019-07-30source · retrieved
BeforeARIN delegated statistics 2019-07-28 (produced 2019-07-28T14:00:13+00:00), before the report: allocated (dated 2015-03-12)source · retrieved
AfterARIN delegated statistics 2019-07-30 (produced 2019-07-30T14:00:13+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
2015-03-12ARIN+ AddApparent reissuance of previously removed resourceStrong inference
ARIN-Issued
Add 174.136.192.0-174.136.255.255
Inventory
Likely issued from ARIN-controlled inventory
No transfer record matches. ARIN's statistics show it available on 2015-03-11 and allocated (dated 2015-03-12) on 2015-03-13. The tracker saw this range released from hold on 2015-02-20 (174.136.192.0-174.136.255.255), so it appears to have been issued again from ARIN's pool.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2015-03-12: "Add 174.136.192.0-174.136.255.255"source · retrieved
BeforeARIN delegated statistics 2015-03-11 (produced 2015-03-11T05:05:19+00:00), before the report: availablesource · retrieved
AfterARIN delegated statistics 2015-03-13 (produced 2015-03-13T05:05:08+00:00), after the report: allocated (dated 2015-03-12)source · retrieved
Classification history for this change (4 versions)
: Apparent reissuance of previously removed resource, strong inference (classifier 1.4.0) current
2015-02-20ARIN− RemoveReleased from hold (ARIN lists it as 'available')Strong inference
ARIN-Issued
Remove 174.136.192.0-174.136.255.255
Inventory
ARIN's statistics now list it as 'available'; reissue not confirmed
ARIN's statistics show it reserved on 2015-02-19 and available on 2015-02-21. 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 2014-10-14, 129 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 2015-02-20: "Remove 174.136.192.0-174.136.255.255"source · retrieved
BeforeARIN delegated statistics 2015-02-19 (produced 2015-02-19T06:05:12+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2015-02-21 (produced 2015-02-21T06:05:18+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
2014-10-14ARINNot in ARIN-IssuedRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2014-12-13. 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 allocated (dated 2008-11-04) on 2014-10-13 and reserved on 2014-10-15. 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 2014-12-13. This does not confirm availability.
Evidence (3) · classifier 1.4.0,
StatisticsNot listed in ARIN-Issued; found by comparing ARIN's daily statistics: 174.136.192.0/18 allocated on 2014-10-14, reserved on 2014-10-15source · retrieved
BeforeARIN delegated statistics 2014-10-13 (produced 2014-10-13T05:03:47+00:00), before the report: allocated (dated 2008-11-04)source · retrieved
AfterARIN delegated statistics 2014-10-15 (produced 2014-10-15T05:03:54+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
2013-10-29ARINNot in ARIN-IssuedRemoved (return, revocation or reclamation not publicly distinguishable)Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2013-12-28. 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 allocated (dated 2008-11-04) on 2013-10-28 and reserved on 2013-10-30. 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 2013-12-28. This does not confirm availability.
Evidence (3) · classifier 1.4.0,
StatisticsNot listed in ARIN-Issued; found by comparing ARIN's daily statistics: 174.136.192.0/18 allocated on 2013-10-29, reserved on 2013-10-30source · retrieved
BeforeARIN delegated statistics 2013-10-28 (produced 2013-10-28T05:06:16+00:00), before the report: allocated (dated 2008-11-04)source · retrieved
AfterARIN delegated statistics 2013-10-30 (produced 2013-10-30T05:06:31+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
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.