NumberResearch Membership · Data 09/21/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026

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
— 406-761 not yet reported which blocks → QWEST CORPORATION 9636 GREATFALLS MT
— 406-762 none assigned yet which blocks → NEMONT TEL COOP INC 2247 OPHEIM MT
— 406-763 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9636 GALATNGTWY MT
— 406-764 none assigned yet which blocks → TRI-COUNTY TEL. ASSN., INC. 2296 NO FRANNIE MT
— 406-765 5XXX6XXX · 2 holders which blocks → NEMONT TEL COOP INC 2247 PLENTYWOOD MT
— 406-766 not yet reported which blocks → NEMONT TEL COOP INC 2247 FROID MT
— 406-767 not yet reported which blocks → RT COMMUNICATIONS 3410 RIDGE MT
— 406-768 none assigned yet which blocks → NEMONT TEL COOP INC 2247 POPLAR MT
— 406-769 3XXX which blocks → NEMONT TEL COOP INC 2247 BAINVILLE MT
— 406-770 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J GREATFALLS MT
— 406-771 not yet reported which blocks → QWEST CORPORATION 9636 GREATFALLS MT
— 406-772 1XXX2XXX7XXX · 2 holders which blocks → MID-RIVERS TEL. COOP., INC. 2246 PLEVNA MT
— 406-773 3XXX7XXX · 2 holders which blocks → MID-RIVERS TEL. COOP., INC. 2246 RICHEY MT
— 406-774 1XXX4XXX · 2 holders which blocks → MID-RIVERS TEL. COOP., INC. 2246 LAMBERT MT
— 406-775 1XXX4XXX5XXX7XXX · 3 holders which blocks → MID-RIVERS TEL. COOP., INC. 2246 EKALAKA MT
— 406-776 not yet reported which blocks → MID-RIVERS TEL. COOP., INC. 2246 SAVAGE MT
— 406-777 6XXX8XXX which blocks → QWEST CORPORATION 9636 STEVENSVL MT
— 406-778 1XXX4XXX · 2 holders which blocks → MID-RIVERS TEL. COOP., INC. 2246 BAKER MT
— 406-779 9XXX which blocks → NEMONT TEL COOP INC 2247 FLAXVLRURL MT
— 406-780 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 COLUMBUS MT
— 406-781 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GREATFALLS MT
— 406-782 not yet reported which blocks → QWEST CORPORATION 9636 BUTTE MT
— 406-783 none assigned yet which blocks → NEMONT TEL COOP INC 2247 SCOBEYRURL MT
— 406-784 none assigned yet which blocks → RANGE TEL COOP INC 2251 ASHLAND MT
— 406-785 4XXX which blocks → NEMONT TEL COOP INC 2247 NO NASHUA MT
— 406-786 none assigned yet which blocks → NEMONT TEL COOP INC 2247 BROCKTON MT
— 406-787 8XXX which blocks → NEMONT TEL COOP INC 2247 CULBERTSON MT
— 406-788 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GREATFALLS MT
— 406-789 none assigned yet which blocks → NEMONT TEL COOP INC 2247 MEDICINELK MT
— 406-790 1XXX4XXX5XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CULBERTSON MT
— 406-791 not yet reported which blocks → QWEST CORPORATION 9636 GREATFALLS MT
— 406-792 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - MT 453F BUTTE MT
— 406-793 not yet reported which blocks → BLACKFOOT TEL. COOP., INC. 2235 OVANDO MT
— 406-795 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9636 WIBAUX MT
— 406-796 0XXX1XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → MID-RIVERS TELEPHONE COOPERATIVE, INC. 7830 WIBAUX MT
— 406-797 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX which blocks → QWEST CORPORATION 9636 ANACONDA MT
— 406-798 not yet reported which blocks → MID-RIVERS TEL. COOP., INC. 2246 WESTSIDNEY MT
— 406-799 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 GREATFALLS MT
— 406-802 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HAMILTON MT
— 406-808 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J HAVRE MT
— 406-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MT
— 406-815 0–9 XXXall 10 · 5 holders which blocks → AT&T - LOCAL 7421 RED LODGE MT
— 406-818 0XXX1XXX4XXX5XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 RED LODGE MT
— 406-821 5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 DARBY MT
— 406-822 8XXX which blocks → BLACKFOOT TEL. COOP., INC. 2235 SUPERIOR MT
— 406-823 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 LIVINGSTON MT
— 406-824 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 STIGNATIUS MT
— 406-825 4XXX which blocks → BLACKFOOT TEL. COOP., INC. 2235 CLINTON MT
— 406-826 1XXX7XXX8XXX · 3 holders which blocks → BLACKFOOT TEL. COOP., INC. 2235 PLAINS MT
— 406-827 none assigned yet which blocks → BLACKFOOT TEL. COOP., INC. 2235 THOMPSNFLS MT

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.