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 586
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 132
MICHIGAN BELL TEL CO 100
NEW CINGULAR WIRELESS PCS, LLC - IL 60
OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 43
AMERICAN MESSAGING SERVICES, LLC 27
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2026-07-01 586-587 7XXX8XXX · 2 holders which blocks → OPENTACT INC. 824J MT CLEMENS MI
2026-05-29 586-379 7XXX9XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ARMADA MI
2025-09-24 586-369 7XXX8XXX9XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ARMADA MI
2025-06-11 586-367 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTERLINE MI
2025-06-09 586-364 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROSEVILLE MI
2025-02-28 586-455 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ARMADA MI
2024-06-12 586-356 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ARMADA MI
2024-05-15 586-347 0XXX1XXX2XXX6XXX7XXX9XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ROSEVILLE MI
2024-04-12 586-351 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ROSEVILLE MI
2024-02-21 586-346 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 UTICA MI
2023-07-20 586-341 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ROMEO MI
2023-06-22 586-368 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLCV - MI 543C WARREN MI
2023-06-02 586-352 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C MT CLEMENS MI
2023-03-07 586-340 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTERLINE MI
2023-02-21 586-358 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H UTICA MI
2023-01-18 586-302 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2022-05-23 586-318 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ROMEO MI
2022-02-28 586-926 0–9 XXXall 10 · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WASHINGTON MI
2022-02-24 586-742 0–9 XXXall 10 · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ROSEVILLE MI
2022-02-24 586-837 0–9 XXXall 10 · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J UTICA MI
2021-12-23 586-310 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E MT CLEMENS MI
2021-12-23 586-328 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WARREN MI
2021-12-21 586-301 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J WARREN MI
2021-10-29 586-326 0XXX3XXX4XXX6XXX7XXX · 2 holders which blocks → ONVOY, LLCV - MI 543C RICHMOND MI
2021-08-26 586-316 0–9 XXXall 10 · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E WARREN MI
2021-08-17 586-345 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H MT CLEMENS MI
2021-07-30 586-334 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C ROSEVILLE MI
2021-07-20 586-325 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C NEWBALTIMR MI
2021-06-25 586-304 0XXX1XXX2XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLCV - MI 543C NEW HAVEN MI
2021-06-16 586-284 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C WASHINGTON MI
2021-05-26 586-287 0–9 XXXall 10 · 4 holders which blocks → STRATUS NETWORKS 495J MT CLEMENS MI
2021-05-19 586-366 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C ARMADA MI
2021-04-28 586-280 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MT CLEMENS MI
2021-01-06 586-355 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C RICHMOND MI
2021-01-06 586-544 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C UTICA MI
2021-01-05 586-278 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTERLINE MI
2019-12-19 586-300 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H MT CLEMENS MI
2019-12-19 586-400 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H ROMEO MI
2019-12-18 586-600 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H CENTERLINE MI
2019-10-10 586-500 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C NEWBALTIMR MI
2019-02-26 586-900 0–9 XXXall 10 · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J MT CLEMENS MI
2019-01-22 586-290 0XXX1XXX2XXX3XXX8XXX9XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 RICHMOND MI
2019-01-21 586-271 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 NEW HAVEN MI
2018-10-01 586-525 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 ARMADA MI
2017-12-08 586-496 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ROSEVILLE MI
2017-11-29 586-788 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E UTICA MI
2017-10-06 586-800 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C ROSEVILLE MI
2017-09-22 586-666 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C MT CLEMENS MI
2017-08-17 586-422 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARMADA MI
2017-07-20 586-519 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E CENTERLINE MI

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.