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
— 517-676 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 MASON MI
— 517-680 1XXX2XXX4XXX7XXX · 3 holders which blocks → FIRST COMMUNICATIONS, LLC 460K ALBION MI
— 517-688 not yet reported which blocks → FRONTIER COMMUNICATIONS OF MICHIGAN, INC. 4417 BUNDY HILL MI
— 517-694 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 HOLT MI
— 517-699 9XXX which blocks → MICHIGAN BELL TEL CO 9323 HOLT MI
— 517-700 not yet reported which blocks → MI
— 517-702 8XXX which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-703 3XXX4XXX6XXX7XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-706 1XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 517-719 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
— 517-726 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MICHIGAN BELL TEL CO 9323 VERMONTVL MI
— 517-734 not yet reported which blocks → MI
— 517-740 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
— 517-741 0XXX6XXX · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 UNION CITY MI
— 517-745 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 JACKSON MI
— 517-748 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C JACKSON MI
— 517-749 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
— 517-750 7XXX8XXX which blocks → MICHIGAN BELL TEL CO 9323 JACKSON MI
— 517-760 0XXX1XXX5XXX6XXX8XXX · 2 holders which blocks → ACD TELECOM, INC. - MI 3535 NASHVILLE MI
— 517-763 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MICHIGAN BELL TEL CO 9323 LANSING MI
— 517-764 8XXX which blocks → MICHIGAN BELL TEL CO 9323 JACKSON MI
— 517-765 0XXX1XXX6XXX8XXX · 3 holders which blocks → FRONTIER MIDSTATES, INC. - MI 0681 BURLINGTON MI
— 517-767 8XXX9XXX · 2 holders which blocks → FRONTIER MIDSTATES, INC. - MI 0681 TEKONSHA MI
— 517-768 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 JACKSON MI
— 517-769 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → MICHIGAN BELL TEL CO 9323 JACKSON MI
— 517-780 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 JACKSON MI
— 517-782 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 JACKSON MI
— 517-783 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 JACKSON MI
— 517-784 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 JACKSON MI
— 517-787 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 JACKSON MI
— 517-788 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 JACKSON MI
— 517-789 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 JACKSON MI
— 517-794 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LANSING MI
— 517-796 3XXX which blocks → MICHIGAN BELL TEL CO 9323 JACKSON MI
— 517-804 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 FOWLERVL MI
— 517-809 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J TECUMSEH MI
— 517-810 not yet reported which blocks → MI
— 517-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 517-812 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 JACKSON MI
— 517-813 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J BLISSFIELD MI
— 517-815 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - MI 0695 TECUMSEH MI
— 517-816 4XXX6XXX · 2 holders which blocks → ONVOY, LLCV - MI 543C LANSING MI
— 517-817 5XXX6XXX8XXX9XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 JACKSON MI
— 517-819 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LANSING MI
— 517-825 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HILLSDALE MI
— 517-827 not yet reported which blocks → PAETEC ITEL, LLC 829J LANSING MI
— 517-840 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 JACKSON MI
— 517-841 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 JACKSON MI
— 517-849 3XXX which blocks → MICHIGAN BELL TEL CO 9323 JONESVILLE 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.