NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 818-657

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 818-657 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 818 blocks

Most active assignees, all time — NPA 818
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 4
TELEPORT COMMUNICATIONS AMERICA, LLC - CA 1
T-MOBILE USA, INC. 1
PEERLESS NETWORK OF CALIFORNIA, LLC - CA 1
ONVOY, LLC - CA 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
2024-03-06 818-657-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CANOGAPARK CA
2013-01-16 818-657-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 CANOGAPARK CA
2024-05-01 818-657-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H CANOGAPARK CA
— 818-657-3XXX 3000–3999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CANOGAPARK CA
— 818-657-4XXX 4000–4999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CANOGAPARK CA
— 818-657-5XXX 5000–5999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CANOGAPARK CA
— 818-657-6XXX 6000–6999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CANOGAPARK CA
2011-12-13 818-657-7XXX 7000–7999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CANOGAPARK CA
2022-05-19 818-657-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C CANOGAPARK CA
2004-12-10 818-657-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D CANOGAPARK 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.