rirtracker

IPv4 range · 256 addresses

209.87.171.0/24

Now

ARIN statistics
Allocated (dated 2025-10-06) (US), in the latest file
Registry
ARIN
Holder
DudeSolutions, Inc.
From
ARIN's latest statistics and the latest transfer record

Latest change

+ Add Apparent reissuance of previously removed resource

Reported
2025-10-06 (ARIN)
Confidence
Strong inference
Inventory
Likely issued from ARIN-controlled inventory

Timeline (6)

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.

2025-10-06 ARIN + Add Apparent reissuance of previously removed resource Strong inference
ARIN-Issued
Add 209.87.171.0-209.87.171.255
Inventory
Likely issued from ARIN-controlled inventory

No transfer record matches. ARIN's statistics show it reserved on 2025-10-05 and allocated (dated 2025-10-06) on 2025-10-07. The tracker saw this range released from hold on 2025-07-01 (209.87.171.0-209.87.171.255), 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 2025-10-06: "Add 209.87.171.0-209.87.171.255" source · retrieved
  2. Before ARIN delegated statistics 2025-10-05 (produced 2025-10-05T13:00:49+00:00), before the report: reserved source · retrieved
  3. After ARIN delegated statistics 2025-10-07 (produced 2025-10-07T13:00:46+00:00), after the report: allocated (dated 2025-10-06) 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
2025-10-06 ARIN − Remove Change to ARIN's own pool record Strong inference
ARIN-Issued
Remove 209.87.171.0-209.87.171.255
Inventory
Part of the issuance reported the same day

ARIN's statistics show it reserved on 2025-10-05 and allocated (dated 2025-10-06) on 2025-10-07. ARIN removed its own pool record for this range as part of issuing it: the same report adds 209.87.171.0-209.87.171.255. The issuance is explained on that line.

Evidence (3) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2025-10-06: "Remove 209.87.171.0-209.87.171.255" source · retrieved
  2. Before ARIN delegated statistics 2025-10-05 (produced 2025-10-05T13:00:49+00:00), before the report: reserved source · retrieved
  3. After ARIN delegated statistics 2025-10-07 (produced 2025-10-07T13:00:46+00:00), after the report: allocated (dated 2025-10-06) 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
2025-07-01 ARIN − Remove No substantive resource change found Strong inference
ARIN-Issued
Remove 209.87.171.0-209.87.171.255
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 2025-07-01: "Remove 209.87.171.0-209.87.171.255" source · retrieved
  2. Before ARIN delegated statistics 2025-06-30 (produced 2025-06-30T13:01:12+00:00), before the report: reserved source · retrieved
  3. After ARIN delegated statistics 2025-07-02 (produced 2025-07-02T13:01:11+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
2024-09-09 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 2024-11-08. 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 1999-04-07) on 2024-09-08 and reserved on 2024-09-10. 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 2024-11-08. 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: 209.87.171.0/24 allocated on 2024-09-09, reserved on 2024-09-10 source · retrieved
  2. Before ARIN delegated statistics 2024-09-08 (produced 2024-09-08T13:00:53+00:00), before the report: allocated (dated 1999-04-07) source · retrieved
  3. After ARIN delegated statistics 2024-09-10 (produced 2024-09-10T13:00:53+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
2023-09-04 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 2023-11-03. 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 1999-04-07) on 2023-09-03 and reserved on 2023-09-05. 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 2023-11-03. 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: 209.87.171.0/24 allocated on 2023-09-04, reserved on 2023-09-05 source · retrieved
  2. Before ARIN delegated statistics 2023-09-03 (produced 2023-09-03T13:00:15+00:00), before the report: allocated (dated 1999-04-07) source · retrieved
  3. After ARIN delegated statistics 2023-09-05 (produced 2023-09-05T13:00:12+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
2017-07-03 ARIN Transfer log Merger/acquisition or reorganization Confirmed
Transfer log
Merger/acquisition: Regional Network Communications, Inc (ARIN) to DudeSolutions, Inc. (ARIN)
From
Regional Network Communications, Inc ARIN
To
DudeSolutions, Inc. ARIN
Piece of
209.87.160.0/20: the rest of the block stayed with the seller
Inventory
No effect on ARIN applicant inventory

ARIN's transfer log records a merger, acquisition or reorganization from Regional Network Communications, Inc (ARIN) to DudeSolutions, Inc. (ARIN) on 2017-07-03 17:24 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,
  1. Transfer log Transfer log: MERGER_ACQUISITION on 2017-07-03 17:24 UTC, Regional Network Communications, Inc (ARIN) to DudeSolutions, Inc. (ARIN); resources moved: 209.87.171.0/24 source · retrieved
  2. Before ARIN delegated statistics 2017-07-02 (produced 2017-07-02T05:08:11+00:00), before the report: allocated (dated 1999-04-07) source · retrieved
  3. After ARIN delegated statistics 2017-07-04 (produced 2017-07-04T05:09:09+00:00), after the report: allocated (dated 1999-04-07) source · retrieved

Transfer records (1)

Date (UTC)LogTypeRange movedFromTo
ARINMerger acquisition209.87.171.0/24 Regional Network Communications, Inc ARINDudeSolutions, Inc. 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.

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