rirtracker

IPv4 range · 256 addresses

204.87.203.0/24

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
2025-08-11 (ARIN)
Confidence
Strong inference
Inventory
Possible future reissue candidate after hold

Hold

Removed
2025-08-11 (ARIN)
Estimated hold end
2025-10-10 (from ARIN's published rule)
Now
Possible reissue candidate; not confirmed available.

Timeline (7)

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.

2025-08-11 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 2025-10-10. 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 2020-06-25) on 2025-08-10 and reserved on 2025-08-12. 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 2025-10-10. 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: 204.87.203.0/24 allocated on 2025-08-11, reserved on 2025-08-12 source · retrieved
  2. Before ARIN delegated statistics 2025-08-10 (produced 2025-08-10T13:00:50+00:00), before the report: allocated (dated 2020-06-25) source · retrieved
  3. After ARIN delegated statistics 2025-08-12 (produced 2025-08-12T13:00:52+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
2020-06-25 ARIN + Add Apparent reissuance of previously removed resource Observed only
ARIN-Issued
Add 204.87.203.0-204.87.203.255
Inventory
Likely issued from ARIN-controlled inventory

No transfer record matches. ARIN's statistics show it reserved on 2020-06-24 and assigned (dated 2020-06-25) on 2020-06-26. The tracker saw this range released from hold on 2020-06-24 (204.87.203.0-204.87.203.255), so it appears to have been issued again from ARIN's pool. Another change to this range was reported the day before or after (2020-06-24: Remove 204.87.203.0-204.87.203.255), so the before-and-after statistics may include it.

Evidence (3) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2020-06-25: "Add 204.87.203.0-204.87.203.255" source · retrieved
  2. Before ARIN delegated statistics 2020-06-24 (produced 2020-06-24T14:00:13+00:00), before the report: reserved source · retrieved
  3. After ARIN delegated statistics 2020-06-26 (produced 2020-06-26T14:00:12+00:00), after the report: assigned (dated 2020-06-25) source · retrieved
Classification history for this change (4 versions)
  1. : Apparent reissuance of previously removed resource, observed only (classifier 1.3.0)
  2. : Apparent reissuance of previously removed resource, observed only (classifier 1.3.1)
  3. : Apparent reissuance of previously removed resource, observed only (classifier 1.3.2)
  4. : Apparent reissuance of previously removed resource, observed only (classifier 1.4.0) current
2020-06-25 ARIN − Remove Change to ARIN's own pool record Observed only
ARIN-Issued
Remove 204.87.203.0-204.87.203.255
Inventory
Part of the issuance reported the same day

ARIN's statistics show it reserved on 2020-06-24 and assigned (dated 2020-06-25) on 2020-06-26. ARIN removed its own pool record for this range as part of issuing it: the same report adds 204.87.203.0-204.87.203.255. The issuance is explained on that line. Another change to this range was reported the day before or after (2020-06-24: Remove 204.87.203.0-204.87.203.255), so the before-and-after statistics may include it.

Evidence (3) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2020-06-25: "Remove 204.87.203.0-204.87.203.255" source · retrieved
  2. Before ARIN delegated statistics 2020-06-24 (produced 2020-06-24T14:00:13+00:00), before the report: reserved source · retrieved
  3. After ARIN delegated statistics 2020-06-26 (produced 2020-06-26T14:00:12+00:00), after the report: assigned (dated 2020-06-25) source · retrieved
Classification history for this change (4 versions)
  1. : Change to ARIN's own pool record, observed only (classifier 1.3.0)
  2. : Change to ARIN's own pool record, observed only (classifier 1.3.1)
  3. : Change to ARIN's own pool record, observed only (classifier 1.3.2)
  4. : Change to ARIN's own pool record, observed only (classifier 1.4.0) current
2020-06-24 ARIN − Remove No substantive resource change found Observed only
ARIN-Issued
Remove 204.87.203.0-204.87.203.255
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). Another change to this range was reported the day before or after (2020-06-25: Remove 204.87.203.0-204.87.203.255; 2020-06-25: Add 204.87.203.0-204.87.203.255), so the before-and-after statistics may include it.

Evidence (3) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2020-06-24: "Remove 204.87.203.0-204.87.203.255" source · retrieved
  2. Before ARIN delegated statistics 2020-06-23 (produced 2020-06-23T14:00:13+00:00), before the report: reserved source · retrieved
  3. After ARIN delegated statistics 2020-06-25 (produced 2020-06-25T14:00:14+00:00), after the report: reserved source · retrieved
Classification history for this change (4 versions)
  1. : No substantive resource change found, observed only (classifier 1.3.0)
  2. : No substantive resource change found, observed only (classifier 1.3.1)
  3. : No substantive resource change found, observed only (classifier 1.3.2)
  4. : No substantive resource change found, observed only (classifier 1.4.0) current
2019-10-07 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 2019-12-06. 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 assigned (dated 2011-10-20) on 2019-10-06 and reserved on 2019-10-08. 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 2019-12-06. 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: 204.87.203.0/24 assigned on 2019-10-07, reserved on 2019-10-08 source · retrieved
  2. Before ARIN delegated statistics 2019-10-06 (produced 2019-10-06T14:00:16+00:00), before the report: assigned (dated 2011-10-20) source · retrieved
  3. After ARIN delegated statistics 2019-10-08 (produced 2019-10-08T14:00:15+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
2011-10-20 ARIN + Add Apparent new issuance Strong inference
ARIN-Issued
Add 204.87.203.0-204.87.203.255
Inventory
Likely issued from ARIN-controlled inventory

No transfer record matches. ARIN's statistics show it not issued on 2011-10-19 and assigned (dated 2011-10-20) on 2011-10-21. (Until 2013-03-05, ARIN's statistics list only what's issued.) 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 2011-10-20: "Add 204.87.203.0-204.87.203.255" source · retrieved
  2. Before ARIN delegated statistics 2011-10-19, before the report: not issued source · retrieved
  3. After ARIN delegated statistics 2011-10-21, after the report: assigned (dated 2011-10-20) 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 new issuance, strong inference (classifier 1.4.0) current
2009-08-31 ARIN − Remove Unresolved change Observed only
ARIN-Issued
Remove 204.87.203.0-204.87.203.255
Inventory
Inventory effect unknown

ARIN-Issued says "Remove", but ARIN's statistics show it not issued on 2009-08-30 and not issued on 2009-09-01. (Until 2013-03-05, ARIN's statistics list only what's issued.) The registry's pool records from that time aren't public, so the tracker can't tell what was removed.

Evidence (3) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2009-08-31: "Remove 204.87.203.0-204.87.203.255" source · retrieved
  2. Before ARIN delegated statistics 2009-08-30, before the report: not issued source · retrieved
  3. After ARIN delegated statistics 2009-09-01, after the report: not issued source · retrieved
Classification history for this change (4 versions)
  1. : Unresolved change, observed only (classifier 1.3.0)
  2. : Unresolved change, observed only (classifier 1.3.1)
  3. : Unresolved change, observed only (classifier 1.3.2)
  4. : Unresolved change, observed only (classifier 1.4.0) current

Transfer records

No transfer log has a transfer of any part of this IPv4 range.

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/204.87.203.0-204.87.203.255.json