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
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
— 406-922 4XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 4222 BOZEMAN MT
— 406-923 3XXX8XXX9XXX · 2 holders which blocks → COMMIO, LLC 939H GREATFALLS MT
— 406-925 5XXX6XXX7XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 DILLON MT
— 406-928 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GRASSRANGE MT
— 406-930 3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BIG TIMBER MT
— 406-931 1XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BIG TIMBER MT
— 406-932 7XXX which blocks → TRIANGLE TEL. COOP. ASSN., INC. 2257 BIG TIMBER MT
— 406-933 3XXX4XXX which blocks → QWEST CORPORATION 9636 HELENA MT
— 406-934 1XXX8XXX · 2 holders which blocks → WIDE VOICE, LLC - MT 743G MILES CITY MT
— 406-935 2XXX3XXX5XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BROADUS MT
— 406-937 not yet reported which blocks → NORTHERN TEL. COOP., INC. 2248 SUNBURST MT
— 406-938 3XXX7XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 ALZADA MT
— 406-939 8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 W GLENDIVE MT
— 406-941 1XXX2XXX3XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 W GLENDIVE MT
— 406-945 7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HAVRE MT
— 406-947 not yet reported which blocks → MID-RIVERS TEL. COOP., INC. 2246 MUSSELSHLL MT
— 406-949 4XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TOWNSEND MT
— 406-950 not yet reported which blocks → MT
— 406-951 7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MILES CITY MT
— 406-952 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H GREATFALLS MT
— 406-953 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SAGEBRUSH CELLULAR, INC. 443B HARDIN MT
— 406-954 2XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 ROY MT
— 406-957 1XXX2XXX3XXX6XXX7XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 TERRY MT
— 406-958 not yet reported which blocks → MT
— 406-959 not yet reported which blocks → MT
— 406-961 2XXX6XXX7XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9636 HAMILTON MT
— 406-962 0XXX1XXX2XXX5XXX6XXX7XXX · 4 holders which blocks → QWEST CORPORATION 9636 JOLIET MT
— 406-963 none assigned yet which blocks → NEMONT TEL COOP INC 2247 FROIDRURAL MT
— 406-964 2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 GREATFALLS MT
— 406-965 1XXX which blocks → AIRUS, INC. - MT 588H GREATFALLS MT
— 406-967 1XXX5XXX · 2 holders which blocks → PROJECT TEL. CO., INC. 2250 WORDEN MT
— 406-969 0–9 XXXall 10 · 4 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J BILLINGS MT
— 406-971 5XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 PLEVNA MT
— 406-972 not yet reported which blocks → WEST RIVER COOPERATIVE TELEPHONE COMPANY 1689 WCAMPCROOK MT
— 406-973 1XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SIDNEY MT
— 406-974 4XXX6XXX7XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 CIRCLE MT
— 406-975 8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 EKALAKA MT
— 406-976 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MT
— 406-977 6XXX7XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 JORDAN MT
— 406-978 9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BAKER MT
— 406-979 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 RICHEY MT
— 406-980 5XXX6XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 TOWNSEND MT
— 406-981 1XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SOMILES CY MT
— 406-982 0XXX1XXX7XXX8XXX9XXX · 5 holders which blocks → CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK 2249 YELLOW BAY MT
— 406-983 1XXX2XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 ASHLAND MT
— 406-984 none assigned yet which blocks → RANGE TEL COOP INC 2251 BIRNEY MT
— 406-987 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GLENDIVE MT
— 406-989 2XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 W GLENDIVE MT
— 406-993 0XXX8XXX · 2 holders which blocks → 3 RIVERS TEL. COOP., INC. 2255 BIG SKY MT
— 406-994 not yet reported which blocks → QWEST CORPORATION 9636 BOZEMAN 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.