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
— 810-664 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LAPEER MI
— 810-667 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LAPEER MI
— 810-670 8XXX which blocks → PAETEC ITEL, LLC 829J CLIMTMORRS MI
— 810-671 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ALGONAC MI
— 810-672 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → MICHIGAN BELL TEL CO 9323 SNOVER MI
— 810-673 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ALMONT MI
— 810-674 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E APPLEGATE MI
— 810-676 3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J MARINECITY MI
— 810-678 0XXX1XXX6XXX7XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 METAMORA MI
— 810-679 6XXX which blocks → MICHIGAN BELL TEL CO 9323 CROSWELL MI
— 810-680 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 BRIGHTON MI
— 810-682 4XXX which blocks → PAETEC ITEL, LLC 829J SANDUSKY MI
— 810-683 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 8 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 IMLAY CITY MI
— 810-686 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 CLIMTMORRS MI
— 810-687 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 CLIMTMORRS MI
— 810-688 0XXX5XXX6XXX · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 NORTH BRCH MI
— 810-689 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PORT HURON MI
— 810-691 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 FLINT MI
— 810-692 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BYRON MI
— 810-694 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 GRANDBLANC MI
— 810-695 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 GRANDBLANC MI
— 810-696 1XXX2XXX3XXX4XXX5XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LEXINGTON MI
— 810-699 0XXX5XXX which blocks → 123.NET, LLC 2550 APPLEGATE MI
— 810-700 not yet reported which blocks → MI
— 810-705 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 BROWN CITY MI
— 810-706 4XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DRYDEN MI
— 810-710 2XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CARSONVL MI
— 810-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 810-712 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CROSWELL MI
— 810-714 6XXX8XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 FENTON MI
— 810-715 5XXX6XXX9XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-720 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-721 4XXX5XXX6XXX7XXX · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 IMLAY CITY MI
— 810-724 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 IMLAY CITY MI
— 810-728 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAPEER MI
— 810-730 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 FLINT MI
— 810-732 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-733 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-735 3XXX which blocks → FRONTIER NORTH, INC. - MI 0695 LINDEN MI
— 810-736 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-742 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-743 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-744 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-748 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → MICHIGAN BELL TEL CO 9323 ALGONAC MI
— 810-750 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FENTON MI
— 810-760 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-762 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-765 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 MARINECITY MI
— 810-766 3XXX9XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 FLINT MI
— 810-767 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLINT 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.