NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
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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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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
— 406-828 8XXX which blocks → RANGE TEL COOP INC 2251 ALZADA MT
— 406-829 not yet reported which blocks → QWEST CORPORATION 9636 MISSOULA MT
— 406-832 not yet reported which blocks → SOUTHERN MONTANA TEL. CO. 2254 WISE RIVER MT
— 406-833 0XXX1XXX2XXX3XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 RONAN MT
— 406-834 not yet reported which blocks → SOUTHERN MONTANA TEL. CO. 2254 JACKSON MT
— 406-835 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 MELROSE MT
— 406-836 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MT 453F GREATFALLS MT
— 406-837 8XXX9XXX · 2 holders which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 BIGFORK MT
— 406-838 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 COOKE CITY MT
— 406-841 none assigned yet which blocks → QWEST CORPORATION 9636 HELENA MT
— 406-842 none assigned yet which blocks → 3 RIVERS TEL. COOP., INC. 2255 SHERIDAN MT
— 406-843 not yet reported which blocks → 3 RIVERS TEL. COOP., INC. 2255 VIRGINIACY MT
— 406-844 1XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 LAKESIDE MT
— 406-846 0XXX4XXX5XXX6XXX · 3 holders which blocks → QWEST CORPORATION 9636 DEER LODGE MT
— 406-847 not yet reported which blocks → BLACKFOOT TEL. COOP., INC. 2235 NOXON MT
— 406-848 0XXX1XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9636 GARDINER MT
— 406-849 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 ELMO MT

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.