rirtracker

IPv4 range · 256 addresses

104.166.123.0/24

Now

ARIN statistics
Reserved, in the latest file
Registry
ARIN
Holder
None: it's in the registry's own pool
From
ARIN's latest statistics

Latest change

Not in ARIN-Issued Removed (return, revocation or reclamation not publicly distinguishable)

Reported
2026-11-09 (ARIN)
Confidence
Strong inference Provisional
Inventory
Possible future reissue candidate after hold

Hold

Removed
2026-11-09 (ARIN)
Estimated hold end
2027-01-08 (from ARIN's published rule)
Now
Possible reissue candidate; not confirmed available.

Timeline (4)

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.

2026-11-09 ARIN Not in ARIN-Issued Removed (return, revocation or reclamation not publicly distinguishable) Strong inference Provisional
Inventory
Possible future reissue candidate after hold
Hold estimate
Estimated hold end 2027-01-08. 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 allocated (dated 2022-01-07) on 2026-11-08 and reserved on 2026-11-10. 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 2027-01-08. 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: 104.166.123.0/24 allocated on 2026-11-09, reserved on 2026-11-10 source · retrieved
  2. Before ARIN delegated statistics 2026-11-08 (produced 2026-11-08T14:00:21+00:00), before the report: allocated (dated 2022-01-07) source · retrieved
  3. After ARIN delegated statistics 2026-11-10 (produced 2026-11-10T14:00:21+00:00), after the report: reserved source · retrieved
2022-01-07 ARIN + Add Apparent reissuance of previously removed resource Strong inference
ARIN-Issued
Add 104.166.123.0-104.166.123.255
Inventory
Likely issued from ARIN-controlled inventory

No transfer record matches. ARIN's statistics show it reserved on 2022-01-06 and allocated (dated 2022-01-07) on 2022-01-08. The tracker saw this range released from hold on 2022-01-05 (104.166.123.0-104.166.123.255), so it appears to have been issued again from ARIN's pool.

Evidence (3) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2022-01-07: "Add 104.166.123.0-104.166.123.255" source · retrieved
  2. Before ARIN delegated statistics 2022-01-06 (produced 2022-01-06T14:00:13+00:00), before the report: reserved source · retrieved
  3. After ARIN delegated statistics 2022-01-08 (produced 2022-01-08T14:00:12+00:00), after the report: allocated (dated 2022-01-07) 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 reissuance of previously removed resource, strong inference (classifier 1.3.2)
  4. : Apparent reissuance of previously removed resource, strong inference (classifier 1.4.0) current
2022-01-07 ARIN − Remove Change to ARIN's own pool record Strong inference
ARIN-Issued
Remove 104.166.123.0-104.166.123.255
Inventory
Part of the issuance reported the same day

ARIN's statistics show it reserved on 2022-01-06 and allocated (dated 2022-01-07) on 2022-01-08. ARIN removed its own pool record for this range as part of issuing it: the same report adds 104.166.123.0-104.166.123.255. The issuance is explained on that line.

Evidence (3) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2022-01-07: "Remove 104.166.123.0-104.166.123.255" source · retrieved
  2. Before ARIN delegated statistics 2022-01-06 (produced 2022-01-06T14:00:13+00:00), before the report: reserved source · retrieved
  3. After ARIN delegated statistics 2022-01-08 (produced 2022-01-08T14:00:12+00:00), after the report: allocated (dated 2022-01-07) 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
2022-01-05 ARIN − Remove No substantive resource change found Strong inference
ARIN-Issued
Remove 104.166.123.0-104.166.123.255
Inventory
No effect on ARIN applicant inventory

ARIN-Issued lists it as "Remove", but ARIN's statistics show the same record before and after (reserved).

Evidence (3) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2022-01-05: "Remove 104.166.123.0-104.166.123.255" source · retrieved
  2. Before ARIN delegated statistics 2022-01-04 (produced 2022-01-04T14:00:13+00:00), before the report: reserved source · retrieved
  3. After ARIN delegated statistics 2022-01-06 (produced 2022-01-06T14:00:13+00:00), after the report: reserved source · retrieved
Classification history for this change (4 versions)
  1. : No substantive resource change found, strong inference (classifier 1.3.0)
  2. : No substantive resource change found, strong inference (classifier 1.3.1)
  3. : No substantive resource change found, strong inference (classifier 1.3.2)
  4. : No substantive resource change found, strong inference (classifier 1.4.0) current

Changes to overlapping ranges

DateRegistryRangeRecorded asWhat happened
2021-07-02ARIN104.166.96.0/19− RemoveARIN pool record
2019-07-29ARIN104.166.96.0/19Not in ARIN-IssuedRemoved
2018-02-21ARIN104.166.96.0/19Transfer logMerger/acquisition
2014-08-19ARIN104.166.96.0/19+ AddApparent new issuance

Transfer records (1)

Date (UTC)LogTypeRange movedFromTo
ARINMerger acquisition104.166.96.0/19 Roya Hosting LLC ARINOppoBox 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

Looked upWhyRegistryHandleOrganizationStatusLast changed
After 24 hours not registered (RDAP 404)
First seen not registered (RDAP 404)

Organization-level details only; contact details are never kept. RDAP shows the registration when it was looked up, not in the past.

This page as data: ip/104.166.123.0-104.166.123.255.json