NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 661-615

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 661-615 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 661 blocks

Most active assignees, all time — NPA 661
LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 3
BANDWIDTH.COM CLEC, LLC - CA 2
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 1
PEERLESS NETWORK OF CALIFORNIA, LLC - CA 1
NEW CINGULAR WIRELESS PCS, LLC 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
2005-09-13 661-615-0XXX 0000–0999Assigned METROPCS, INC. 5562 BKFD NORTH CA
— 661-615-1XXX 1000–1999Reserved LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 BKFD NORTH CA
2014-04-01 661-615-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD NORTH CA
2011-02-15 661-615-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C BKFD NORTH CA
— 661-615-4XXX 4000–4999Reserved LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 BKFD NORTH CA
2008-06-16 661-615-5XXX 5000–5999Assigned LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 BKFD NORTH CA
2004-05-11 661-615-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J BKFD NORTH CA
2021-05-09 661-615-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD NORTH CA
2014-10-27 661-615-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD NORTH CA
2016-11-03 661-615-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BKFD NORTH CA

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.