NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
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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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 586-283 9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 WARREN MI
— 586-285 5XXX which blocks → MICHIGAN BELL TEL CO 9323 ROSEVILLE MI
— 586-286 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 MT CLEMENS MI
— 586-292 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
— 586-293 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ROSEVILLE MI
— 586-294 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ROSEVILLE MI
— 586-295 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
— 586-296 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ROSEVILLE MI
— 586-303 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLCV - MI 543C WARREN MI
— 586-306 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
— 586-307 2XXX4XXX5XXX6XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 MT CLEMENS MI
— 586-308 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ROSEVILLE MI
— 586-309 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ROSEVILLE MI
— 586-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 586-313 not yet reported which blocks → MI
— 586-314 none assigned yet which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 UTICA MI
— 586-317 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J RICHMOND MI
— 586-319 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 WARREN MI
— 586-321 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
— 586-322 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
— 586-323 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 UTICA MI
— 586-327 0–9 XXXwhole prefix which blocks → ONVOY, LLCV - MI 543C ROSEVILLE MI
— 586-330 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E NEWBALTIMR MI
— 586-331 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ROMEO MI
— 586-336 8XXX which blocks → MICHIGAN BELL TEL CO 9323 ROMEO MI
— 586-337 7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROMEO MI
— 586-339 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 NEW HAVEN MI
— 586-344 not yet reported which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WARREN MI
— 586-349 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J MT CLEMENS MI
— 586-350 0XXX2XXX · 2 holders which blocks → METROPCS, INC. 5562 ROSEVILLE MI
— 586-353 5XXX8XXX which blocks → PAETEC ITEL, LLC 829J CENTERLINE MI
— 586-354 0–9 XXXall 10 · 3 holders which blocks → 123.NET, LLC 2550 WARREN MI
— 586-360 0XXX1XXX2XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 ROSEVILLE MI
— 586-361 not yet reported which blocks → SPOK, INC. 6630 ROMEO MI
— 586-362 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 6 holders which blocks → METROPCS, INC. 5562 ROSEVILLE MI
— 586-363 not yet reported which blocks → SPOK, INC. 6630 MT CLEMENS MI
— 586-372 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ROMEO MI
— 586-380 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ROMEO MI
— 586-381 5XXX7XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
— 586-382 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
— 586-383 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
— 586-393 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C CENTERLINE MI
— 586-402 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 WARREN MI
— 586-403 not yet reported which blocks → SPOK, INC. 6630 MT CLEMENS MI
— 586-405 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MT CLEMENS MI
— 586-406 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 WARREN MI
— 586-408 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J MT CLEMENS MI
— 586-409 not yet reported which blocks → SPOK, INC. 6630 MT CLEMENS MI
— 586-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 586-412 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 MT CLEMENS MI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.