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
— 406-226 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9636 EGLACIERPK MT
— 406-227 not yet reported which blocks → QWEST CORPORATION 9636 HELENA MT
— 406-228 5XXX which blocks → NEMONT TEL COOP INC 2247 GLASGOW MT
— 406-230 4XXX6XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GLASGOW MT
— 406-232 not yet reported which blocks → QWEST CORPORATION 9636 MILES CITY MT
— 406-233 0XXX1XXX6XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 MILES CITY MT
— 406-234 not yet reported which blocks → MID-RIVERS TELEPHONE COOPERATIVE, INC. 7830 MILES CITY MT
— 406-235 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → QWEST CORPORATION 9636 WOLF CREEK MT
— 406-236 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 NEIHART MT
— 406-237 not yet reported which blocks → QWEST CORPORATION 9636 BILLINGS MT
— 406-238 not yet reported which blocks → QWEST CORPORATION 9636 BILLINGS MT
— 406-239 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MISSOULA MT
— 406-240 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MISSOULA MT
— 406-241 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MISSOULA MT
— 406-243 not yet reported which blocks → QWEST CORPORATION 9636 MISSOULA MT
— 406-244 not yet reported which blocks → BLACKFOOT TEL. COOP., INC. 2235 POTOMAC MT
— 406-245 not yet reported which blocks → QWEST CORPORATION 9636 BILLINGS MT
— 406-246 not yet reported which blocks → BLACKFOOT TEL. COOP., INC. 2235 DIXON MT
— 406-247 0XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 BILLINGS MT
— 406-248 0XXX which blocks → QWEST CORPORATION 9636 BILLINGS MT
— 406-249 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
— 406-250 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
— 406-251 not yet reported which blocks → QWEST CORPORATION 9636 MISSOULA MT
— 406-252 not yet reported which blocks → QWEST CORPORATION 9636 BILLINGS MT
— 406-253 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
— 406-254 not yet reported which blocks → QWEST CORPORATION 9636 BILLINGS MT
— 406-255 not yet reported which blocks → QWEST CORPORATION 9636 BILLINGS MT
— 406-256 not yet reported which blocks → QWEST CORPORATION 9636 BILLINGS MT
— 406-257 not yet reported which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 KALISPELL MT
— 406-258 0XXX1XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 MISSOULA MT
— 406-259 not yet reported which blocks → QWEST CORPORATION 9636 BILLINGS MT
— 406-260 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
— 406-261 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
— 406-262 0XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9636 HAVRE MT
— 406-263 not yet reported which blocks → SAGEBRUSH CELLULAR, INC. 443B GLASGOW MT
— 406-264 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 FORT SHAW MT
— 406-265 not yet reported which blocks → QWEST CORPORATION 9636 HAVRE MT
— 406-266 0XXX1XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9636 TOWNSEND MT
— 406-267 not yet reported which blocks → SOUTHERN MONTANA TEL. CO. 2254 DIVIDE MT
— 406-268 4XXX5XXX · 2 holders which blocks → QWEST CORPORATION 9636 GREATFALLS MT
— 406-270 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
— 406-271 6XXX which blocks → 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 3924 CONRAD MT
— 406-272 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - MT 453F BILLINGS MT
— 406-273 1XXX8XXX which blocks → QWEST CORPORATION 9636 MISSOULA MT
— 406-274 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G MISSOULA MT
— 406-275 not yet reported which blocks → RONAN TEL. CO. 2252 PABLO MT
— 406-276 none assigned yet which blocks → 3 RIVERS TEL. COOP., INC. 2255 LIMA MT
— 406-277 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 BELT MT
— 406-278 1XXX2XXX6XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 CONRAD MT
— 406-279 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 VALIER 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.