NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

355 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, last 30 days
8X8, INC. 38
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
— 248-367 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ROYAL OAK MI
— 248-368 0XXX7XXX9XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 SOUTHFIELD MI
— 248-369 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 HOLLY MI
— 248-370 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PONTIAC MI
— 248-371 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PONTIAC MI
— 248-372 0XXX1XXX9XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 SOUTHFIELD MI
— 248-373 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PONTIAC MI
— 248-374 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 NORTHVILLE MI
— 248-375 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ROCHESTER MI
— 248-376 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROYAL OAK MI
— 248-377 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PONTIAC MI
— 248-379 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 TROY MI
— 248-380 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 NORTHVILLE MI
— 248-381 0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FARMINGTON MI
— 248-382 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HOLLY MI
— 248-383 3XXX5XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J DRAYTON PL MI
— 248-384 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX which blocks → PAETEC ITEL, LLC 829J CLARKSTON MI
— 248-386 4XXX6XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 SOUTHFIELD MI
— 248-387 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → PAETEC ITEL, LLC 829J COMMERCE MI
— 248-388 none assigned yet which blocks → METROPCS, INC. 5562 SOUTHFIELD MI
— 248-390 none assigned yet which blocks → METROPCS, INC. 5562 PONTIAC MI
— 248-391 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PONTIAC MI
— 248-393 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 PONTIAC MI
— 248-394 3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 CLARKSTON MI
— 248-395 5XXX which blocks → MICHIGAN BELL TEL CO 9323 SOUTHFIELD MI
— 248-396 none assigned yet which blocks → METROPCS, INC. 5562 PONTIAC MI
— 248-397 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 ROYAL OAK MI
— 248-398 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ROYAL OAK MI
— 248-399 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 ROYAL OAK MI
— 248-400 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 SOUTHFIELD MI
— 248-401 not yet reported which blocks → SPOK, INC. 6630 ROYAL OAK MI
— 248-402 3XXX which blocks → PAETEC ITEL, LLC 829J ROCHESTER MI
— 248-404 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MICHIGAN BELL TEL CO 9323 TROY MI
— 248-405 not yet reported which blocks → SPOK, INC. 6630 ROYAL OAK MI
— 248-406 4XXX6XXX7XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J W BLOOMFLD MI
— 248-407 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 AUBURN HTS MI
— 248-408 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PONTIAC MI
— 248-409 8XXX which blocks → PAETEC ITEL, LLC 829J PONTIAC MI
— 248-410 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 PONTIAC MI
— 248-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 248-412 1XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NORTHVILLE MI
— 248-413 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROCHESTER MI
— 248-414 1XXX which blocks → MICHIGAN BELL TEL CO 9323 ROYAL OAK MI
— 248-415 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 SOUTHFIELD MI
— 248-416 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 SOUTHFIELD MI
— 248-417 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 SOUTHFIELD MI
— 248-418 1XXX4XXX6XXX7XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J PONTIAC MI
— 248-419 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 W BLOOMFLD MI
— 248-420 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC MI
— 248-421 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PONTIAC 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.