NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 256
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
2016-10-03 256-913 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 JACKSONVL AL
2004-01-28 256-675 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 ALEXANDRCY AL
2003-04-18 256-625 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → METROPCS, INC. 5562 ALEXANDRCY AL
2003-04-18 256-626 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 SYLACAUGA AL
2003-04-16 256-592 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → METROPCS, INC. 5562 TALLADEGA AL
2003-01-13 256-510 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 CHILDERSBG AL
2002-12-31 256-364 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → METROPCS, INC. 5562 FORT PAYNE AL
2002-12-26 256-501 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 6 holders which blocks → METROPCS, INC. 5562 ATHENS AL
2001-05-02 256-755 3XXX4XXX5XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 HUNTSVILLE AL
2001-04-26 256-349 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 FLORENCE AL
2001-01-29 256-286 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → METROPCS, INC. 5562 HARTSELLE AL
2001-01-29 256-289 0XXX2XXX5XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 MADISON AL
2001-01-29 256-320 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → METROPCS, INC. 5562 SHEFFIELD AL
2001-01-29 256-330 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 OHATCHEE AL
— 256-214 3XXX4XXX5XXX7XXX8XXX9XXX which blocks → METROPCS, INC. 5562 DECATUR AL
— 256-223 3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 TALLADEGA AL
— 256-297 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → METROPCS, INC. 5562 CULLMAN AL
— 256-310 none assigned yet which blocks → METROPCS, INC. 5562 ANNISTON AL
— 256-323 5XXX6XXX7XXX8XXX9XXX which blocks → METROPCS, INC. 5562 HUNTSVILLE AL
— 256-434 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 ATHENS AL
— 256-553 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 GADSDEN AL
— 256-554 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 FLORENCE AL
— 256-648 2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 FLORENCE AL
— 256-759 6XXX8XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 HUNTSVILLE AL
— 256-990 none assigned yet which blocks → METROPCS, INC. 5562 HUNTSVILLE AL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.