NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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, last 30 days — NPA 956
8X8, INC. 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 NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 956-387 not yet reported which blocks → SOUTHWESTERN BELL 9533 EDINBURG TX
— 956-388 0XXX which blocks → SOUTHWESTERN BELL 9533 EDINBURG TX
— 956-389 0XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 HARLINGEN TX
— 956-390 not yet reported which blocks → SOUTHWESTERN BELL 9533 HARLINGEN TX
— 956-392 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 HARLINGEN TX
— 956-393 0XXX1XXX7XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 EDINBURG TX
— 956-395 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C RIO HONDO TX
— 956-399 not yet reported which blocks → SOUTHWESTERN BELL 9533 SAN BENITO TX
— 956-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 956-412 not yet reported which blocks → SOUTHWESTERN BELL 9533 HARLINGEN TX
— 956-417 not yet reported which blocks → ALENCO COMMUNICATIONS, INC. 2090 DOLORES TX
— 956-418 not yet reported which blocks → ALENCO COMMUNICATIONS, INC. 2090 DOLORES TX
— 956-419 not yet reported which blocks → ALENCO COMMUNICATIONS, INC. 2090 DOLORES TX
— 956-421 not yet reported which blocks → SOUTHWESTERN BELL 9533 HARLINGEN TX
— 956-423 not yet reported which blocks → SOUTHWESTERN BELL 9533 HARLINGEN TX
— 956-424 2XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 MISSION TX
— 956-425 not yet reported which blocks → SOUTHWESTERN BELL 9533 HARLINGEN TX
— 956-427 not yet reported which blocks → SOUTHWESTERN BELL 9533 HARLINGEN TX
— 956-428 not yet reported which blocks → SOUTHWESTERN BELL 9533 HARLINGEN TX
— 956-429 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 MCALLEN TX
— 956-430 not yet reported which blocks → SOUTHWESTERN BELL 9533 HARLINGEN TX
— 956-440 5XXX which blocks → SOUTHWESTERN BELL 9533 HARLINGEN TX
— 956-444 2XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 HARLINGEN TX
— 956-447 7XXX which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 WESLACO TX
— 956-451 none assigned yet which blocks → STPCS JOINT VENTURE, LLC 4290 MCALLEN TX
— 956-452 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D LAREDO TX
— 956-453 0XXX1XXX which blocks → STPCS JOINT VENTURE, LLC 4290 HARLINGEN TX
— 956-454 none assigned yet which blocks → METROPCS, INC. 5562 HARLINGEN TX
— 956-461 0XXX1XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 DONNA TX
— 956-464 not yet reported which blocks → SOUTHWESTERN BELL 9533 DONNA TX
— 956-473 8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LAREDO TX
— 956-481 not yet reported which blocks → VALLEY TEL. COOP., INC. 2159 SAN ISIDRO TX
— 956-485 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 SULLIVANCY TX
— 956-486 not yet reported which blocks → VALLEY TEL. COOP., INC. 2159 EL SAUZ TX
— 956-487 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 RIGRANDECY TX
— 956-488 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 RIGRANDECY TX
— 956-490 0XXX which blocks → STPCS JOINT VENTURE, LLC 4290 HARLINGEN TX
— 956-491 0XXX9XXX · 2 holders which blocks → STPCS JOINT VENTURE, LLC 4290 HARLINGEN TX
— 956-492 0XXX1XXX9XXX · 2 holders which blocks → WAVENATION, LLC 700J HARLINGEN TX
— 956-493 0XXX which blocks → STPCS JOINT VENTURE, LLC 4290 HARLINGEN TX
— 956-494 0XXX2XXX4XXX · 2 holders which blocks → METROPCS, INC. 5562 HARLINGEN TX
— 956-495 0XXX2XXX which blocks → STPCS JOINT VENTURE, LLC 4290 HARLINGEN TX
— 956-496 0XXX2XXX · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K HARLINGEN TX
— 956-497 0XXX2XXX which blocks → STPCS JOINT VENTURE, LLC 4290 HARLINGEN TX
— 956-498 0XXX2XXX which blocks → STPCS JOINT VENTURE, LLC 4290 HARLINGEN TX
— 956-499 0XXX2XXX which blocks → STPCS JOINT VENTURE, LLC 4290 HARLINGEN TX
— 956-500 8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RIGRANDECY TX
— 956-501 none assigned yet which blocks → STPCS JOINT VENTURE, LLC 4290 HARLINGEN TX
— 956-504 not yet reported which blocks → SOUTHWESTERN BELL 9533 BROWNSVL TX
— 956-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX

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.