NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

2 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 — NPA 810
NEW CINGULAR WIRELESS PCS, LLC - IL 2
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
— 810-417 4XXX5XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 IMLAY CITY MI
— 810-422 3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-423 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 FLINT MI
— 810-424 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-426 0XXX5XXX · 2 holders which blocks → 123.NET, LLC 2550 MARINECITY MI
— 810-429 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FLINT MI
— 810-433 3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FENTON MI
— 810-434 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PORT HURON MI
— 810-441 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LAPEER MI
— 810-444 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FLINT MI
— 810-454 9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 ST CLAIR MI
— 810-455 3XXX8XXX which blocks → PAETEC ITEL, LLC 829J PORT HURON MI
— 810-458 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E LINDEN MI
— 810-459 none assigned yet which blocks → METROPCS, INC. 5562 PONTIAC MI
— 810-462 1XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E YALE MI
— 810-471 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FLINT MI
— 810-474 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E AVOCA MI
— 810-475 0XXX1XXX2XXX3XXX5XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E BROWN CITY MI
— 810-476 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 APPLEGATE MI
— 810-479 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PORT HURON MI
— 810-487 4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MICHIGAN BELL TEL CO 9323 FLUSHING MI
— 810-494 1XXX3XXX7XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 BRIGHTON MI
— 810-496 7XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FLINT MI
— 810-499 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 SOUTHFIELD MI
— 810-503 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DAVISON MI
— 810-505 5XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E DECKERVL MI
— 810-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 810-513 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FLINT MI
— 810-516 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FLINT MI
— 810-519 2XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FENTON MI
— 810-520 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 XXXXXXXXXX MI
— 810-522 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E BRIGHTON MI
— 810-523 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 SOUTHFIELD MI
— 810-525 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E EMMETT MI
— 810-528 not yet reported which blocks → SPOK, INC. 6630 FLINT MI
— 810-533 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 SOUTHFIELD MI
— 810-534 7XXX which blocks → PAETEC ITEL, LLC 829J BRIGHTON MI
— 810-538 5XXX which blocks → PAETEC ITEL, LLC 829J LAPEER MI
— 810-542 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DRYDEN MI
— 810-543 4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MEMPHIS MI
— 810-544 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E CARSONVL MI
— 810-545 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E COLUMBIAVL MI
— 810-546 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E CROSWELL MI
— 810-547 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E CLIMTMORRS MI
— 810-548 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LAPEER MI
— 810-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST MI
— 810-557 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 SANDUSKY MI
— 810-560 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 SOUTHFIELD MI
— 810-561 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J ST CLAIR MI
— 810-564 5XXX6XXX7XXX8XXX · 4 holders which blocks → MICHIGAN BELL TEL CO 9323 CLIMTMORRS MI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.