NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

341 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 21
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
— 810-516 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
— 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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.