NumberResearch Membership · Data 09/28/2026

Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/28/2026

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
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 19
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
— 406-383 not yet reported which blocks → TRIANGLE TEL. COOP. ASSN., INC. 3310 DODSON MT
— 406-384 1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 4222 BILLINGS MT
— 406-385 none assigned yet which blocks → NEMONT TEL COOP INC 2247 WESTBY MT
— 406-386 not yet reported which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 HOPPILLIAD MT
— 406-387 0XXX1XXX2XXX6XXX7XXX8XXX · 5 holders which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 HUNGRYHORS MT
— 406-388 not yet reported which blocks → QWEST CORPORATION 9636 BELGRADE MT
— 406-390 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SOUTHHAVRE MT
— 406-391 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CUT BANK MT
— 406-392 none assigned yet which blocks → NEMONT TEL COOP INC 2247 NO WOLF PT MT
— 406-394 6XXX which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 NORTHHAVRE MT
— 406-395 1XXX which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 SOUTHHAVRE MT
— 406-397 not yet reported which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 HINGHAM MT
— 406-398 none assigned yet which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 NORTHHAVRE MT
— 406-399 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SOUTHHAVRE MT
— 406-410 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
— 406-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MT
— 406-421 0XXX2XXX which blocks → RANGE TEL COOP INC 2251 SOMILES CY MT
— 406-422 0–9 XXXall 10 · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K HELENA MT
— 406-423 not yet reported which blocks → TRIANGLE TEL. COOP. ASSN., INC. 3310 HOBSON MT
— 406-425 5XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 RED LODGE MT
— 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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/28/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.