NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 337
METROPCS, INC. 25
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 NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2005-09-02 337-563 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 CARLYSS LA
2005-09-02 337-796 0XXX4XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 HACKBERRY LA
2004-03-19 337-222 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 DE QUINCY LA
2004-03-19 337-338 0XXX8XXX which blocks → METROPCS, INC. 5562 WELSH LA
2004-03-19 337-379 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 IOWA LA
2004-03-19 337-391 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → METROPCS, INC. 5562 IOWA LA
2003-09-17 337-377 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 LK CHARLES LA
2003-04-14 337-335 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 NEW IBERIA LA
2003-03-12 337-218 0XXX1XXX4XXX5XXX6XXX9XXX · 6 holders which blocks → METROPCS, INC. 5562 JENNINGS LA
2002-12-19 337-213 0XXX1XXX2XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 LEESVILLE LA
2002-12-19 337-343 0XXX1XXX2XXX3XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 DE RIDDER LA
2001-09-17 337-316 4XXX which blocks → METROPCS, INC. 5562 LAFAYETTE LA
2001-06-28 337-274 none assigned yet which blocks → METROPCS, INC. 5562 LK CHARLES LA
2001-03-14 337-251 none assigned yet which blocks → METROPCS, INC. 5562 NEW IBERIA LA
2001-03-09 337-249 7XXX8XXX which blocks → METROPCS, INC. 5562 SWEET LAKE LA
2001-01-09 337-370 7XXX8XXX · 2 holders which blocks → METROPCS, INC. 5562 JENNINGS LA
— 337-201 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 NEW IBERIA LA
— 337-212 none assigned yet which blocks → METROPCS, INC. 5562 LAFAYETTE LA
— 337-215 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 SULPHUR LA
— 337-319 none assigned yet which blocks → METROPCS, INC. 5562 LAFAYETTE LA
— 337-540 none assigned yet which blocks → METROPCS, INC. 5562 LK CHARLES LA
— 337-766 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → METROPCS, INC. 5562 LAWTELL LA
— 337-794 none assigned yet which blocks → METROPCS, INC. 5562 LK CHARLES LA
— 337-802 none assigned yet which blocks → METROPCS, INC. 5562 LK CHARLES LA
— 337-912 4XXX5XXX8XXX9XXX which blocks → METROPCS, INC. 5562 LK CHARLES LA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.