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 406
QWEST CORPORATION 132
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 119
NEW CINGULAR WIRELESS PCS, LLC 74
ONVOY, LLC - MT 43
TRIANGLE TEL. COOP. ASSN., INC. 39
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
— 406-281 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G BILLINGS MT
— 406-282 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9636 MANHATTAN MT
— 406-283 0XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER 4322 LIBBY MT
— 406-284 0XXX1XXX2XXX5XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 MANHATTAN MT
— 406-285 1XXX2XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 THREEFORKS MT
— 406-286 none assigned yet which blocks → NEMONT TEL COOP INC 2247 RESERVE MT
— 406-287 0XXX1XXX4XXX6XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 WHITEHALL MT
— 406-288 not yet reported which blocks → BLACKFOOT TEL. COOP., INC. 2235 DRUMMOND MT
— 406-289 1XXX3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CONRAD MT
— 406-291 8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIBBY MT
— 406-292 2XXX which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 JOPLIN MT
— 406-293 none assigned yet which blocks → ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER 4322 LIBBY MT
— 406-294 not yet reported which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 4222 BILLINGS MT
— 406-295 0XXX1XXX2XXX3XXX6XXX8XXX · 2 holders which blocks → ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER 4322 TROY MT
— 406-296 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER 4322 EUREKA MT
— 406-297 not yet reported which blocks → INTERBEL TELEPHONE COOPERATIVE, INC. - MT 3959 EUREKARURL MT
— 406-298 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 COLUMBUS MT
— 406-310 0–9 XXXall 10 · 5 holders which blocks → BLACKFOOT COMMUNICATIONS, INC. - MT 7870 BUTTE MT
— 406-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MT
— 406-312 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NUSO, LLC 478J BOZEMAN MT
— 406-315 0–9 XXXall 10 · 4 holders which blocks → SAGEBRUSH CELLULAR, INC. 443B GREATFALLS MT
— 406-317 0–9 XXXall 10 · 6 holders which blocks → TELNYX LLC 073H MISSOULA MT
— 406-319 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K POLSON MT
— 406-320 3XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 ROUNDUP MT
— 406-321 5XXX6XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 COLUMBUS MT
— 406-322 2XXX3XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9636 COLUMBUS MT
— 406-323 none assigned yet which blocks → MID-RIVERS TEL. COOP., INC. 2246 ROUNDUP MT
— 406-324 0XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 HELENA MT
— 406-325 0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → NUSO, LLC 732J BILLINGS MT
— 406-326 not yet reported which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 REEDPOINT MT
— 406-327 not yet reported which blocks → QWEST CORPORATION 9636 MISSOULA MT
— 406-328 3XXX which blocks → PROJECT TEL. CO., INC. 2250 ABSAROKEE MT
— 406-329 not yet reported which blocks → QWEST CORPORATION 9636 MISSOULA MT
— 406-330 0XXX1XXX2XXX3XXX · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K CLINTON MT
— 406-331 1XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 ROUNDUP MT
— 406-332 1XXX2XXX · 2 holders which blocks → BLACKFOOT TEL. COOP., INC. 2235 PABLO MT
— 406-333 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → QWEST CORPORATION 9636 LIVINGSTON MT
— 406-335 not yet reported which blocks → NORTHERN TEL. COOP., INC. 2248 SWEETGRASS MT
— 406-336 not yet reported which blocks → NORTHERN TEL. COOP., INC. 2248 NOCUT BANK MT
— 406-337 not yet reported which blocks → NORTHERN TEL. COOP., INC. 2248 KEVINOLMNT MT
— 406-338 0XXX which blocks → SIYEH COMMUNICATIONS 619J BROWNING MT
— 406-339 not yet reported which blocks → NORTHERN TEL. COOP., INC. 2248 ETHRIDGE MT
— 406-340 0XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LIMA MT
— 406-342 2XXX which blocks → RANGE TEL COOP INC 2251 HYSHAM MT
— 406-343 3XXX which blocks → PROJECT TEL. CO., INC. 2250 WYOLA MT
— 406-344 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HAVRE MT
— 406-345 0XXX1XXX4XXX5XXX6XXX · 4 holders which blocks → MID-RIVERS TELEPHONE COOPERATIVE, INC. 7830 GLENDIVE MT
— 406-347 not yet reported which blocks → RANGE TEL COOP INC 2251 ROSEBUD MT
— 406-348 1XXX5XXX · 2 holders which blocks → PROJECT TEL. CO., INC. 2250 HUNTLEY MT
— 406-349 not yet reported which blocks → BLACKFOOT TEL. COOP., INC. 2235 ALTA MT

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.