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
— 810-571 1XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
— 810-577 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 FLINT MI
— 810-579 6XXX which blocks → PAETEC ITEL, LLC 829J GRANDBLANC MI
— 810-581 not yet reported which blocks → SPOK, INC. 6630 MARINECITY MI
— 810-583 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J SANDUSKY MI
— 810-584 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 GRANDBLANC MI
— 810-588 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J BRIGHTON MI
— 810-591 not yet reported which blocks → PAETEC ITEL, LLC 829J FLINT MI
— 810-592 none assigned yet which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 SANDUSKY MI
— 810-593 none assigned yet which blocks → PAETEC ITEL, LLC 829J FENTON MI
— 810-595 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 BRIGHTON MI
— 810-597 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 FLINT MI
— 810-599 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 BRIGHTON MI
— 810-602 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 SOUTHFIELD MI
— 810-603 5XXX7XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 GRANDBLANC MI
— 810-605 3XXX5XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J FLUSHING MI
— 810-606 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 GRANDBLANC MI
— 810-610 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 FLINT MI
— 810-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 810-614 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LAPEER MI
— 810-621 not yet reported which blocks → LENNON TEL. CO. 0708 LENNON MI
— 810-622 6XXX7XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 PT SANILAC MI
— 810-626 0XXX1XXX2XXX3XXX5XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BRIGHTON MI
— 810-628 1XXX3XXX6XXX · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 SWARTZ CRK MI
— 810-629 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FENTON MI
— 810-630 3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 SWARTZ CRK MI
— 810-631 0XXX1XXX3XXX5XXX7XXX · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 OTISVILLE MI
— 810-632 8XXX which blocks → MICHIGAN BELL TEL CO 9323 HARTLAND MI
— 810-633 0XXX2XXX4XXX7XXX8XXX · 5 holders which blocks → MICHIGAN BELL TEL CO 9323 APPLEGATE MI
— 810-635 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 SWARTZ CRK MI
— 810-636 1XXX9XXX · 2 holders which blocks → BRIGHTSPEED OF CENTRAL MICHIGAN, INC 0671 GOODRICH MI
— 810-637 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ST CLAIR MI
— 810-638 0XXX1XXX3XXX4XXX8XXX9XXX · 6 holders which blocks → BRIGHTSPEED OF CENTRAL MICHIGAN, INC 0671 NEWLOTHROP MI
— 810-639 not yet reported which blocks → BRIGHTSPEED OF CENTRAL MICHIGAN, INC 0671 MONTROSE MI
— 810-640 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 CLIMTMORRS MI
— 810-641 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E SNOVER MI
— 810-642 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E SMITHS CRK MI
— 810-644 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E SWARTZ CRK MI
— 810-645 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J PT SANILAC MI
— 810-648 7XXX which blocks → MICHIGAN BELL TEL CO 9323 SANDUSKY MI
— 810-650 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 PORT HURON MI
— 810-652 5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 DAVISON MI
— 810-653 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 DAVISON MI
— 810-654 1XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → FRONTIER NORTH, INC. - MI 0695 DAVISON MI
— 810-655 0XXX1XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 RANKIN MI
— 810-657 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 6 holders which blocks → MICHIGAN BELL TEL CO 9323 CARSONVL MI
— 810-658 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 DAVISON MI
— 810-659 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FLUSHING MI
— 810-660 0–9 XXXall 10 · 6 holders which blocks → GRID 4 COMMUNICATIONS, INC. - MI 9714 LAPEER MI
— 810-661 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 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.