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
— 406-426 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 RED LODGE MT
— 406-427 not yet reported which blocks → RANGE TEL COOP INC 2251 SO BROADUS MT
— 406-428 8XXX which blocks → MID-RIVERS TEL. COOP., INC. 2246 GRASSRANGE MT
— 406-429 8XXX which blocks → MID-RIVERS TEL. COOP., INC. 2246 WINNETT MT
— 406-430 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → ONVOY, LLC - MT 453F HELENA MT
— 406-431 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
— 406-432 not yet reported which blocks → NORTHERN TEL. COOP., INC. 2248 DEVON MT
— 406-433 not yet reported which blocks → MID-RIVERS TELEPHONE COOPERATIVE, INC. 7830 SIDNEY MT
— 406-434 1XXX4XXX6XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9636 SHELBY MT
— 406-435 0XXX9XXX · 2 holders which blocks → TDS METROCOM, LLC 520K BILLINGS MT
— 406-436 8XXX which blocks → RANGE TEL COOP INC 2251 BROADUS MT
— 406-439 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HELENA MT
— 406-441 not yet reported which blocks → QWEST CORPORATION 9636 HELENA MT
— 406-442 not yet reported which blocks → QWEST CORPORATION 9636 HELENA MT
— 406-443 not yet reported which blocks → QWEST CORPORATION 9636 HELENA MT
— 406-444 not yet reported which blocks → QWEST CORPORATION 9636 HELENA MT
— 406-445 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → QWEST CORPORATION 9636 RED LODGE MT
— 406-446 6XXX7XXX8XXX which blocks → QWEST CORPORATION 9636 RED LODGE MT
— 406-447 0XXX which blocks → QWEST CORPORATION 9636 HELENA MT
— 406-448 8XXX which blocks → NEMONT TEL COOP INC 2247 NO POPLAR MT
— 406-449 not yet reported which blocks → QWEST CORPORATION 9636 HELENA MT
— 406-450 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SHELBY MT
— 406-452 not yet reported which blocks → QWEST CORPORATION 9636 GREATFALLS MT
— 406-453 not yet reported which blocks → QWEST CORPORATION 9636 GREATFALLS MT
— 406-454 not yet reported which blocks → QWEST CORPORATION 9636 GREATFALLS MT
— 406-455 none assigned yet which blocks → QWEST CORPORATION 9636 GREATFALLS MT
— 406-456 not yet reported which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 SO CHESTER MT
— 406-457 6XXX which blocks → QWEST CORPORATION 9636 HELENA MT
— 406-458 none assigned yet which blocks → QWEST CORPORATION 9636 HELENA MT
— 406-459 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
— 406-460 5XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SHELBY MT
— 406-461 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
— 406-462 not yet reported which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 WINIFRED MT
— 406-463 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 POWER MT
— 406-464 4XXX6XXX · 2 holders which blocks → MID-RIVERS TEL. COOP., INC. 2246 ROY MT
— 406-465 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
— 406-466 7XXX which blocks → 3 RIVERS TEL. COOP., INC. 2255 CHOTEAU MT
— 406-467 0XXX which blocks → 3 RIVERS TEL. COOP., INC. 2255 FAIRFIELD MT
— 406-468 1XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 CASCADE MT
— 406-469 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 PENDROY MT
— 406-470 1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SHELBY MT
— 406-472 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 DUPUYER MT
— 406-473 not yet reported which blocks → TRIANGLE TEL. COOP. ASSN., INC. 3310 JUDITH GAP MT
— 406-474 not yet reported which blocks → NEMONT TEL COOP INC 2247 FLAXVILLE MT
— 406-475 0XXX1XXX2XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9636 HELENA MT
— 406-476 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9636 DUTTON MT
— 406-477 1XXX which blocks → RANGE TEL COOP INC 2251 LAME DEER MT
— 406-478 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SIDNEY MT
— 406-480 6XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SIDNEY MT
— 406-482 0XXX5XXX which blocks → QWEST CORPORATION 9636 SIDNEY 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.