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.
2025-10-07ARIN+ AddApparent reissuance of previously removed resourceObserved only
ARIN-Issued
Add 131.143.109.0-131.143.109.255
Inventory
Likely issued from ARIN-controlled inventory
No transfer record matches. ARIN's statistics show it reserved on 2025-10-06 and allocated (dated 2025-10-07) on 2025-10-08. The tracker saw this range released from hold on 2025-10-06 (131.143.0.0-131.143.255.255), so it appears to have been issued again from ARIN's pool. Another change to this range was reported the day before or after (2025-10-06: Remove 131.143.0.0-131.143.255.255), so the before-and-after statistics may include it.
Evidence (3) · classifier 1.4.0,
ARIN-IssuedARIN-Issued report for 2025-10-07: "Add 131.143.109.0-131.143.109.255"source · retrieved
BeforeARIN delegated statistics 2025-10-06 (produced 2025-10-06T13:00:50+00:00), before the report: reservedsource · retrieved
AfterARIN delegated statistics 2025-10-08 (produced 2025-10-08T13:00:46+00:00), after the report: allocated (dated 2025-10-07)source · retrieved
Classification history for this change (4 versions)
: Apparent reissuance of previously removed resource, observed only (classifier 1.3.0)
: Apparent reissuance of previously removed resource, observed only (classifier 1.3.1)
: Apparent reissuance of previously removed resource, observed only (classifier 1.3.2)
: Apparent reissuance of previously removed resource, observed only (classifier 1.4.0) current
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.