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
— 810-320 2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PORT HURON MI
— 810-324 0XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 AVOCA MI
— 810-325 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → FRONTIER NORTH, INC. - MI 0695 GOODELLS MI
— 810-326 7XXX9XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 ST CLAIR MI
— 810-327 4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 JEDDO MI
— 810-328 2XXX3XXX4XXX5XXX6XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J ST CLAIR MI
— 810-329 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ST CLAIR MI
— 810-333 4XXX7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 BRIGHTON MI
— 810-334 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PORT HURON MI
— 810-335 6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ALGONAC MI
— 810-338 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAPEER MI
— 810-339 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J FLINT MI
— 810-340 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 PORT HURON MI
— 810-341 2XXX3XXX4XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-342 8XXX9XXX which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-343 8XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 SOUTHFIELD MI
— 810-346 0XXX1XXX5XXX7XXX · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 BROWN CITY MI
— 810-347 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FLINT MI
— 810-348 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FLINT MI
— 810-355 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BRIGHTON MI
— 810-356 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LAPEER MI
— 810-359 0XXX1XXX4XXX6XXX9XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 LEXINGTON MI
— 810-364 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PORT HURON MI
— 810-367 0XXX1XXX4XXX5XXX · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 SMITHS CRK MI
— 810-368 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 CLIMTMORRS MI
— 810-370 0XXX1XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E BYRON MI
— 810-371 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → 123.NET, LLC 2550 CAPAC MI
— 810-373 0–9 XXXall 10 · 7 holders which blocks → COMCAST IP PHONE, LLC 318J FENTON MI
— 810-374 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E OTISVILLE MI
— 810-376 1XXX7XXX · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 DECKERVL MI
— 810-377 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E LEXINGTON MI
— 810-378 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → MICHIGAN BELL TEL CO 9323 PECK MI
— 810-384 0XXX3XXX5XXX7XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 EMMETT MI
— 810-385 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PORT HURON MI
— 810-387 5XXX6XXX7XXX · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 YALE MI
— 810-388 3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → MICHIGAN BELL TEL CO 9323 PORT HURON MI
— 810-389 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 FLINT MI
— 810-390 0XXX5XXX · 2 holders which blocks → 123.NET, LLC 2550 FENTON MI
— 810-391 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J FLINT MI
— 810-392 0XXX1XXX4XXX5XXX6XXX · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 MEMPHIS MI
— 810-394 not yet reported which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 FLINT MI
— 810-395 0XXX5XXX · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 CAPAC MI
— 810-396 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J FLINT MI
— 810-397 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 FLINT MI
— 810-398 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J LEXINGTON MI
— 810-404 not yet reported which blocks → THUMB CELLULAR LP 6718 CARSONVL MI
— 810-407 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FLINT MI
— 810-410 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E FLINT MI
— 810-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 810-414 not yet reported which blocks → THUMB CELLULAR LP 6718 CARSONVL 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.