rirtracker

IPv4 range · 16,384 addresses

172.81.0.0/18

Now

ARIN statistics
Allocated (dated 2021-04-01), allocated (dated 2021-04-06), allocated (dated 2021-04-07), allocated (dated 2021-04-09), allocated (dated 2021-04-19), allocated (dated 2021-04-21), allocated (dated 2021-04-22), allocated (dated 2021-05-03) (CA, US), in the latest file
Registry
ARIN
Holder
Not looked up
From
ARIN's latest statistics

Latest change

− Remove Change to ARIN's own pool record

Reported
2021-04-01 (ARIN)
Confidence
Strong inference
Inventory
Part of the issuance reported the same day

Timeline (5)

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.

2021-04-01 ARIN − Remove Change to ARIN's own pool record Strong inference
ARIN-Issued
Remove 172.81.0.0-172.81.63.255
Inventory
Part of the issuance reported the same day

ARIN's statistics show it reserved on 2021-03-31 and allocated (dated 2021-04-01), reserved on 2021-04-02. ARIN removed its own pool record for this range as part of issuing it: the same report adds 172.81.0.0-172.81.3.255, 172.81.16.0-172.81.19.255, 172.81.20.0-172.81.23.255, 172.81.38.0-172.81.39.255 and 6 more. The issuance is explained on those lines.

Evidence (3) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2021-04-01: "Remove 172.81.0.0-172.81.63.255" source · retrieved
  2. Before ARIN delegated statistics 2021-03-31 (produced 2021-03-31T14:00:13+00:00), before the report: reserved source · retrieved
  3. After ARIN delegated statistics 2021-04-02 (produced 2021-04-02T14:00:13+00:00), after the report: allocated (dated 2021-04-01), reserved source · retrieved
Classification history for this change (4 versions)
  1. : Change to ARIN's own pool record, strong inference (classifier 1.3.0)
  2. : Change to ARIN's own pool record, strong inference (classifier 1.3.1)
  3. : Change to ARIN's own pool record, strong inference (classifier 1.3.2)
  4. : Change to ARIN's own pool record, strong inference (classifier 1.4.0) current
2019-10-28 ARIN Not in ARIN-Issued Removed (return, revocation or reclamation not publicly distinguishable) Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2019-12-27. 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 2015-05-11) on 2019-10-27 and reserved on 2019-10-29. 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 2019-12-27. This does not confirm availability.

Evidence (3) · classifier 1.4.0,
  1. Statistics Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 172.81.0.0/18 allocated on 2019-10-28, reserved on 2019-10-29 source · retrieved
  2. Before ARIN delegated statistics 2019-10-27 (produced 2019-10-27T14:00:12+00:00), before the report: allocated (dated 2015-05-11) source · retrieved
  3. After ARIN delegated statistics 2019-10-29 (produced 2019-10-29T14:00:12+00:00), after the report: reserved source · retrieved
Classification history for this change (4 versions)
  1. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.0)
  2. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.1)
  3. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.2)
  4. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.4.0) current
2017-06-13 ARIN Not in ARIN-Issued Removed (return, revocation or reclamation not publicly distinguishable) Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2017-08-12. 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 2015-05-11) on 2017-06-12 and reserved on 2017-06-14. 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 2017-08-12. This does not confirm availability.

Evidence (3) · classifier 1.4.0,
  1. Statistics Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 172.81.0.0/18 allocated on 2017-06-13, reserved on 2017-06-14 source · retrieved
  2. Before ARIN delegated statistics 2017-06-12 (produced 2017-06-12T05:10:01+00:00), before the report: allocated (dated 2015-05-11) source · retrieved
  3. After ARIN delegated statistics 2017-06-14 (produced 2017-06-14T05:10:20+00:00), after the report: reserved source · retrieved
Classification history for this change (4 versions)
  1. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.0)
  2. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.1)
  3. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.2)
  4. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.4.0) current
2016-06-07 ARIN Not in ARIN-Issued Removed (return, revocation or reclamation not publicly distinguishable) Strong inference
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2016-08-06. 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 2015-05-11) on 2016-06-06 and reserved on 2016-06-08. 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 2016-08-06. This does not confirm availability.

Evidence (3) · classifier 1.4.0,
  1. Statistics Not listed in ARIN-Issued; found by comparing ARIN's daily statistics: 172.81.0.0/18 allocated on 2016-06-07, reserved on 2016-06-08 source · retrieved
  2. Before ARIN delegated statistics 2016-06-06 (produced 2016-06-06T05:04:32+00:00), before the report: allocated (dated 2015-05-11) source · retrieved
  3. After ARIN delegated statistics 2016-06-08 (produced 2016-06-08T05:04:16+00:00), after the report: reserved source · retrieved
Classification history for this change (4 versions)
  1. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.0)
  2. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.1)
  3. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.3.2)
  4. : Removed (return, revocation or reclamation not publicly distinguishable), strong inference (classifier 1.4.0) current
2015-05-11 ARIN + Add Apparent new issuance Strong inference
ARIN-Issued
Add 172.81.0.0-172.81.63.255
Inventory
Likely issued from ARIN-controlled inventory

No transfer record matches. ARIN's statistics show it available on 2015-05-10 and allocated (dated 2015-05-11) on 2015-05-12. 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,
  1. ARIN-Issued ARIN-Issued report for 2015-05-11: "Add 172.81.0.0-172.81.63.255" source · retrieved
  2. Before ARIN delegated statistics 2015-05-10 (produced 2015-05-10T05:05:16+00:00), before the report: available source · retrieved
  3. After ARIN delegated statistics 2015-05-12 (produced 2015-05-12T05:04:55+00:00), after the report: allocated (dated 2015-05-11) source · retrieved
Classification history for this change (4 versions)
  1. : Apparent reissuance of previously removed resource, strong inference (classifier 1.3.0)
  2. : Apparent reissuance of previously removed resource, strong inference (classifier 1.3.1)
  3. : Apparent new issuance, strong inference (classifier 1.3.2)
  4. : Apparent new issuance, strong inference (classifier 1.4.0) current

Changes to overlapping ranges

DateRegistryRangeRecorded asWhat happened
2026-08-31ARIN172.81.38.0/23Transfer logMerger/acquisition
2026-07-13ARIN172.81.40.0/22Not in ARIN-IssuedRemoved
2026-06-26ARIN172.81.32.0/22Transfer logMerger/acquisition
2025-07-07ARIN172.81.40.0/22Not in ARIN-IssuedRemoved
2021-05-03ARIN172.81.4.0/22+ AddMerger/acquisition
2021-05-03ARIN172.81.4.0/22− RemoveMerger/acquisition
2021-04-22ARIN172.81.32.0/22+ AddApparent reissuance
2021-04-22ARIN172.81.32.0/22− RemoveARIN pool record
2021-04-21ARIN172.81.12.0/22+ AddApparent reissuance
2021-04-21ARIN172.81.12.0/22− RemoveARIN pool record
2021-04-19ARIN172.81.9.0/24+ AddApparent reissuance
2021-04-19ARIN172.81.9.0/24− RemoveARIN pool record
2021-04-09ARIN172.81.8.0/24+ AddApparent reissuance
2021-04-09ARIN172.81.8.0/24− RemoveARIN pool record
2021-04-07ARIN172.81.10.0/23+ AddApparent reissuance
2021-04-07ARIN172.81.10.0/23− RemoveARIN pool record
2021-04-06ARIN172.81.24.0/22+ AddApparent reissuance
2021-04-06ARIN172.81.24.0/22− RemoveARIN pool record
2021-04-06ARIN172.81.28.0/22+ AddApparent reissuance
2021-04-06ARIN172.81.28.0/22− RemoveARIN pool record
2021-04-06ARIN172.81.36.0/24+ AddApparent reissuance
2021-04-06ARIN172.81.36.0/24− RemoveARIN pool record
2021-04-06ARIN172.81.37.0/24+ AddApparent reissuance
2021-04-06ARIN172.81.37.0/24− RemoveARIN pool record
2021-04-01ARIN172.81.0.0/22+ AddApparent reissuance
2021-04-01ARIN172.81.16.0/22+ AddApparent reissuance
2021-04-01ARIN172.81.20.0/22+ AddApparent reissuance
2021-04-01ARIN172.81.38.0/23+ AddApparent reissuance
2021-04-01ARIN172.81.40.0/22+ AddApparent reissuance
2021-04-01ARIN172.81.44.0/22+ AddApparent reissuance
2021-04-01ARIN172.81.48.0/22+ AddApparent reissuance
2021-04-01ARIN172.81.52.0/22+ AddApparent reissuance
2021-04-01ARIN172.81.56.0/22+ AddApparent reissuance
2021-04-01ARIN172.81.60.0/22+ AddApparent reissuance

Transfer records (3)

Date (UTC)LogTypeRange movedFromTo
ARINMerger acquisition172.81.38.0/23 Setson LLC ARINThree Lanterns LLC ARIN
ARINMerger acquisition172.81.32.0/22 Netwire ARINNetwork Advisors, LLC ARIN
ARINMerger acquisition172.81.4.0/22 Bass Trading LLC ARINBTIG LLC ARIN

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.

This page as data: ip/172.81.0.0-172.81.63.255.json