NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 580-475

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 580-475 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 580 blocks

Most active assignees, all time — NPA 580
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5
SOUTHWESTERN BELL 2
NEW CINGULAR WIRELESS PCS, LLC - IL 2
CHICKASAW TELECOMMUNICAIONS SERVICES, INC. 1
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
— 580-475-0XXX 0000–0999Reserved SOUTHWESTERN BELL 9533 DUNCAN OK
2014-05-16 580-475-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DUNCAN OK
2007-03-01 580-475-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 DUNCAN OK
— 580-475-3XXX 3000–3999Reserved SOUTHWESTERN BELL 9533 DUNCAN OK
2006-08-07 580-475-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 DUNCAN OK
2006-06-09 580-475-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 DUNCAN OK
2008-07-07 580-475-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DUNCAN OK
2004-10-06 580-475-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 DUNCAN OK
2007-07-23 580-475-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 DUNCAN OK
2008-09-19 580-475-9XXX 9000–9999Assigned CHICKASAW TELECOMMUNICAIONS SERVICES, INC. 4630 DUNCAN OK

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.