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 325
FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 61
SOUTHWESTERN BELL 39
NEW CINGULAR WIRELESS PCS, LLC - IL 35
ONVOY, LLC - TX 32
24
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
— 325-330 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COMANCHE TX
— 325-338 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ABILENE TX
— 325-344 not yet reported which blocks → CENTRAL TEXAS TEL. COOP., INC. 2052 LOHN TX
— 325-347 none assigned yet which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 MASON TX
— 325-348 none assigned yet which blocks → COLEMAN COUNTY TEL. COOP., INC. 2057 SANTA ANNA TX
— 325-356 0XXX4XXX6XXX · 3 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 COMANCHE TX
— 325-357 not yet reported which blocks → COLEMAN COUNTY TEL. COOP., INC. 2057 MOZELLE TX
— 325-361 not yet reported which blocks → TX
— 325-365 0XXX which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 BALLINGER TX
— 325-370 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ABILENE TX
— 325-372 none assigned yet which blocks → CENTRAL TEXAS TEL. COOP., INC. 2052 SAN SABA TX
— 325-378 0XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 STERLINGCY TX
— 325-379 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 TOW TX
— 325-382 not yet reported which blocks → COLEMAN COUNTY TEL. COOP., INC. 2057 LK COLEMAN TX
— 325-387 4XXX8XXX · 2 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SONORA TX
— 325-388 none assigned yet which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 KINGSLAND TX
— 325-392 0XXX7XXX · 2 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 OZONA TX
— 325-396 0XXX1XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 MENARD TX
— 325-409 not yet reported which blocks → TX
— 325-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 325-423 6XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 LLANO TX
— 325-428 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-429 not yet reported which blocks → HILL COUNTRY TEL. COOP., INC. 2086 FREDONIA TX
— 325-431 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 ALBANY TX
— 325-432 not yet reported which blocks → TX
— 325-437 not yet reported which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F ABILENE TX
— 325-439 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ABILENE TX
— 325-442 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 ROWENA TX
— 325-444 not yet reported which blocks → TEXAS COMMUNICATIONS, INC. 6820 SAN ANGELO TX
— 325-446 1XXX5XXX · 2 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 JUNCTION TX
— 325-450 9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 SAN ANGELO TX
— 325-452 not yet reported which blocks → CENTRAL TEXAS TEL. COOP., INC. 2052 RICHLD SPG TX
— 325-453 0XXX1XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 ROBERT LEE TX
— 325-456 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EDEN TX
— 325-463 not yet reported which blocks → CENTRAL TEXAS TEL. COOP., INC. 2052 MERCURY TX
— 325-465 0XXX1XXX3XXX7XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 CARLSBAD TX
— 325-468 1XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 MILES TX
— 325-469 not yet reported which blocks → CENTRAL TEXAS TEL. COOP., INC. 2052 EOLA TX
— 325-473 1XXX which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 BRONTE TX
— 325-475 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 LONDON TX
— 325-481 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SAN ANGELO TX
— 325-482 4XXX7XXX · 2 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SAN ANGELO TX
— 325-483 not yet reported which blocks → CENTRAL TEXAS TEL. COOP., INC. 2052 DOOLEMLSVW TX
— 325-484 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 WATER VLY TX
— 325-486 not yet reported which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 4344 SAN ANGELO TX
— 325-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 325-512 not yet reported which blocks → TX
— 325-513 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ABILENE TX
— 325-514 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ABILENE TX
— 325-523 0XXX1XXX8XXX · 3 holders which blocks → TELNYX LLC 073H LORAINE TX

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.