NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

372 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 27
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 517-353 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-355 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-357 not yet reported which blocks → FRONTIER COMMUNICATIONS OF MICHIGAN, INC. 4417 CAMBRIA MI
— 517-358 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
— 517-360 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LANSING MI
— 517-363 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-364 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-367 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-368 not yet reported which blocks → FRONTIER COMMUNICATIONS OF MICHIGAN, INC. 4417 CAMDEN MI
— 517-369 none assigned yet which blocks → FRONTIER NORTH, INC. - MI 0695 BRONSON MI
— 517-371 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-372 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-373 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-374 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-376 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J HOWELL MI
— 517-377 2XXX5XXX6XXX7XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-381 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-383 not yet reported which blocks → FRONTIER COMMUNICATIONS OF MICHIGAN, INC. 4417 PRATTVILLE MI
— 517-388 7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LANSING MI
— 517-390 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 JACKSON MI
— 517-391 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
— 517-392 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
— 517-393 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-394 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-398 7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HILLSDALE MI
— 517-401 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MORENCI MI
— 517-402 not yet reported which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
— 517-403 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ADRIAN MI
— 517-404 none assigned yet which blocks → METROPCS, INC. 5562 HOWELL MI
— 517-407 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 JONESVILLE MI
— 517-409 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TWILIO INTERNATIONAL, INC. 506J BLISSFIELD MI
— 517-410 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
— 517-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 517-414 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
— 517-417 not yet reported which blocks → TC3 TELECOM, INC. - MI 3459 ADRIAN MI
— 517-418 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOMER MI
— 517-420 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LANSING MI
— 517-423 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 TECUMSEH MI
— 517-424 2XXX which blocks → FRONTIER NORTH, INC. - MI 0695 TECUMSEH MI
— 517-425 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HILLSDALE MI
— 517-431 0XXX1XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - MI 0695 TIPTON MI
— 517-432 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-436 0XXX1XXX2XXX4XXX5XXX8XXX · 5 holders which blocks → SAND CREEK TEL. CO. 0725 SAND CREEK MI
— 517-437 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 HILLSDALE MI
— 517-438 5XXX6XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ADRIAN MI
— 517-439 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 HILLSDALE MI
— 517-441 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 EATON RPD MI
— 517-442 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ADRIAN MI
— 517-443 2XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → OGDEN TEL. CO. 0714 OGDEN CTR MI
— 517-445 3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → COMMUNICATIONS CORP. OF MI 0672 CLAYTON 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.