NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 818-721

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 818-721 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
METROPCS NETWORKS, LLC 3
ONVOY, LLC - CA 1
LEVEL 3 COMMUNICATIONS, LLC - CA 1
BANDWIDTH.COM CLEC, 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
2026-07-24 818-721-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C NORTHRIDGE CA
2011-09-19 818-721-1XXX 1000–1999Assigned METROPCS NETWORKS, LLC 899D NORTHRIDGE CA
— 818-721-2XXX 2000–2999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J NORTHRIDGE CA
— 818-721-3XXX 3000–3999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J NORTHRIDGE CA
— 818-721-4XXX 4000–4999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J NORTHRIDGE CA
— 818-721-5XXX 5000–5999Reserved U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J NORTHRIDGE CA
2010-03-12 818-721-6XXX 6000–6999Assigned METROPCS NETWORKS, LLC 899D NORTHRIDGE CA
2018-09-13 818-721-7XXX 7000–7999Assigned METROPCS NETWORKS, LLC 899D NORTHRIDGE CA
2011-04-28 818-721-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E NORTHRIDGE CA
2014-04-10 818-721-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 NORTHRIDGE 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.