rirtracker

IPv4 range · 131,072 addresses

48.100.0.0/15

Now

ARIN statistics
Allocated (dated 2026-10-29) (US), in the latest file
Registry
ARIN
Holder
OpenAI OpCo, LLC OOL-15
From
RDAP, looked up 2026-11-06 18:18 UTC

Latest change

+ Add Intra-ARIN transfer

Reported
2026-10-29 (ARIN)
Confidence
Confirmed
Inventory
No effect on ARIN applicant inventory

Timeline (1)

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.

2026-10-29 ARIN + Add Intra-ARIN transfer Confirmed
ARIN-Issued
Add 48.100.0.0-48.101.255.255
From
The Prudential Insurance Company of America ARIN
To
OpenAI OpCo, LLC ARIN
Inventory
No effect on ARIN applicant inventory

ARIN's transfer log records a transfer from The Prudential Insurance Company of America (ARIN) to OpenAI OpCo, LLC (ARIN) on 2026-10-29 14:04 UTC. ARIN-Issued lists it as "Add" because the registration changed hands; it is not a new allocation from ARIN.

Evidence (4) · classifier 1.4.0,
  1. ARIN-Issued ARIN-Issued report for 2026-10-29: "Add 48.100.0.0-48.101.255.255" source · retrieved
  2. Transfer log Transfer log: RESOURCE_TRANSFER on 2026-10-29 14:04 UTC, The Prudential Insurance Company of America (ARIN) to OpenAI OpCo, LLC (ARIN); resources moved: 48.100.0.0/15 source · retrieved
  3. Before ARIN delegated statistics 2026-10-28 (produced 2026-10-28T13:00:21+00:00), before the report: allocated (dated 1990-12-07) source · retrieved
  4. After ARIN delegated statistics 2026-10-30 (produced 2026-10-30T13:00:20+00:00), after the report: allocated (dated 2026-10-29) source · retrieved

Transfer records (1)

Date (UTC)LogTypeRange movedFromTo
ARINResource transfer48.100.0.0/15 The Prudential Insurance Company of America ARINOpenAI OpCo, 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 7 days ARINNET-48-100-0-0-1OpenAI OpCo, LLC OOL-15active2026-10-30
After 24 hours ARINNET-48-100-0-0-1OpenAI OpCo, LLC OOL-15active2026-10-30
First seen ARINNET-48-100-0-0-1OpenAI OpCo, LLC OOL-15active2026-10-30

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/48.100.0.0-48.101.255.255.json