NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 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, 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
— 248-476 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FARMINGTON MI
— 248-477 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FARMINGTON MI
— 248-478 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FARMINGTON MI
— 248-479 3XXX4XXX6XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 FARMINGTON MI
— 248-481 0XXX1XXX5XXX7XXX8XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J PONTIAC MI
— 248-482 2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 FARMINGTON MI
— 248-483 0XXX1XXX2XXX6XXX · 4 holders which blocks → MICHIGAN BELL TEL CO 9323 SOUTHFIELD MI
— 248-484 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J PONTIAC MI
— 248-485 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J SOUTHFIELD MI
— 248-486 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 SOUTH LYON MI
— 248-487 1XXX6XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J W BLOOMFLD MI
— 248-488 7XXX which blocks → MICHIGAN BELL TEL CO 9323 FARMINGTON MI
— 248-489 6XXX which blocks → MICHIGAN BELL TEL CO 9323 FARMINGTON MI
— 248-491 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SOUTH LYON MI
— 248-494 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
— 248-496 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PONTIAC MI
— 248-498 not yet reported which blocks → TELNET WORLDWIDE, INC. 817J TROY MI
— 248-501 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 SOUTHFIELD MI
— 248-502 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 BIRMINGHAM MI
— 248-503 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 SOUTHFIELD MI
— 248-504 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NORTHVILLE MI
— 248-505 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PONTIAC MI
— 248-506 none assigned yet which blocks → METROPCS, INC. 5562 ROYAL OAK MI
— 248-507 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CLARKSTON MI
— 248-508 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 SOUTHFIELD MI
— 248-509 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C TROY MI
— 248-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 248-512 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PONTIAC MI
— 248-514 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 SOUTHFIELD MI
— 248-515 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TROY MI
— 248-519 3XXX6XXX7XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J TROY MI
— 248-520 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PONTIAC MI
— 248-521 none assigned yet which blocks → METROPCS, INC. 5562 SOUTHFIELD MI
— 248-522 0XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FARMINGTON MI
— 248-523 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 FARMINGTON MI
— 248-524 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TROY MI
— 248-526 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TROY MI
— 248-527 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 PONTIAC MI
— 248-528 7XXX which blocks → MICHIGAN BELL TEL CO 9323 TROY MI
— 248-529 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E MILFDWH LK MI
— 248-530 not yet reported which blocks → PAETEC ITEL, LLC 829J BIRMINGHAM MI
— 248-531 8XXX which blocks → PAETEC ITEL, LLC 829J HOLLY MI
— 248-533 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 NORTHVILLE MI
— 248-534 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HOLLY MI
— 248-535 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PONTIAC MI
— 248-536 2XXX which blocks → PAETEC ITEL, LLC 829J FARMINGTON MI
— 248-537 2XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J AUBURN HTS MI
— 248-538 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 W BLOOMFLD MI
— 248-539 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 W BLOOMFLD MI
— 248-540 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 BIRMINGHAM 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.