NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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, all time — NPA 248
MICHIGAN BELL TEL CO 251
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 72
NEW CINGULAR WIRELESS PCS, LLC - IL 66
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 62
LEVEL 3 COMMUNICATIONS, LLC - MI 58
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
— 248-660 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HOLLY MI
— 248-661 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 W BLOOMFLD MI
— 248-662 5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J NORTHVILLE MI
— 248-663 not yet reported which blocks → PAETEC ITEL, LLC 829J SOUTHFIELD MI
— 248-664 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MILFDWH LK MI
— 248-665 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J SOUTHFIELD MI
— 248-666 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 DRAYTON PL MI
— 248-667 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 SOUTH LYON MI
— 248-668 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WALLEDLAKE MI
— 248-669 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WALLEDLAKE MI
— 248-670 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 TROY MI
— 248-671 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 W BLOOMFLD MI
— 248-672 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PONTIAC MI
— 248-673 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 DRAYTON PL MI
— 248-674 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 DRAYTON PL MI
— 248-675 5XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E NORTHVILLE MI
— 248-676 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 MILFDWH LK MI
— 248-677 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ROYAL OAK MI
— 248-678 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J AUBURN HTS MI
— 248-679 0XXX2XXX5XXX6XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NORTHVILLE MI
— 248-680 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TROY MI
— 248-681 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PONTIAC MI
— 248-682 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PONTIAC MI
— 248-683 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PONTIAC MI
— 248-684 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 MILFDWH LK MI
— 248-685 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 MILFDWH LK MI
— 248-686 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BIRMINGHAM MI
— 248-687 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E TROY MI
— 248-688 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E TROY MI
— 248-689 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TROY MI
— 248-690 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J LAKE ORION MI
— 248-691 5XXX which blocks → MICHIGAN BELL TEL CO 9323 ROYAL OAK MI
— 248-692 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 NORTHVILLE MI
— 248-693 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 LAKE ORION MI
— 248-694 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 COMMERCE MI
— 248-695 not yet reported which blocks → TELNET WORLDWIDE, INC. 4632 BIRMINGHAM MI
— 248-696 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BIRMINGHAM MI
— 248-697 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 NORTHVILLE MI
— 248-698 none assigned yet which blocks → MICHIGAN BELL TEL CO 9323 COMMERCE MI
— 248-699 4XXX5XXX6XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E FARMINGTON MI
— 248-700 not yet reported which blocks → MI
— 248-701 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
— 248-702 0XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 W BLOOMFLD MI
— 248-703 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 TROY MI
— 248-705 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
— 248-706 6XXX8XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 PONTIAC MI
— 248-708 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J HOLLY MI
— 248-709 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TROY MI
— 248-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 248-712 1XXX3XXX4XXX6XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 BIRMINGHAM MI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.