NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

355 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)

Which carriers received which NPA-NXX prefixes, and where. A single prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are often split across different carriers — use the blocks link on any row (or the thousands-block view above) to see which carrier holds which block. 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-NXXAssigneeOCNRate centerState
— 734-433 pooled blocks → MICHIGAN BELL TEL CO 9323 CHELSEA MI
— 734-434 blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-436 pooled blocks → PEERLESS NETWORK OF MICHIGAN, LLC - MI 933G ANN ARBOR MI
— 734-437 pooled blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LIVONIA MI
— 734-438 blocks → TELNET WORLDWIDE, INC. 817J MAYBEE MI
— 734-439 pooled blocks → MICHIGAN BELL TEL CO 9323 MILAN MI
— 734-440 pooled blocks → PAETEC ITEL, LLC 829J NEW BOSTON MI
— 734-441 pooled blocks → PAETEC ITEL, LLC 829J ROCKWOOD MI
— 734-442 pooled blocks → PAETEC ITEL, LLC 829J ROMULUS MI
— 734-443 pooled blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NEW BOSTON MI
— 734-445 pooled blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 YPSILANTI MI
— 734-446 pooled blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PLYMOUTH MI
— 734-447 pooled blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 WAYNE MI
— 734-448 pooled blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 YPSILANTI MI
— 734-449 pooled blocks → MICHIGAN BELL TEL CO 9323 WHITMORELK MI
— 734-451 blocks → MICHIGAN BELL TEL CO 9323 PLYMOUTH MI
— 734-452 pooled blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 LIVONIA MI
— 734-453 blocks → MICHIGAN BELL TEL CO 9323 PLYMOUTH MI
— 734-454 blocks → MICHIGAN BELL TEL CO 9323 PLYMOUTH MI
— 734-455 blocks → MICHIGAN BELL TEL CO 9323 PLYMOUTH MI
— 734-456 pooled blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 PLYMOUTH MI
— 734-457 blocks → MICHIGAN BELL TEL CO 9323 MONROE MI
— 734-458 blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-459 blocks → MICHIGAN BELL TEL CO 9323 PLYMOUTH MI
— 734-461 pooled blocks → MICHIGAN BELL TEL CO 9323 WILLIS MI
— 734-462 blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-464 blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-466 pooled blocks → MICHIGAN BELL TEL CO 9323 LIVONIA MI
— 734-467 blocks → MICHIGAN BELL TEL CO 9323 WAYNE MI
— 734-468 blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 PLYMOUTH MI
— 734-469 pooled blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 LIVONIA MI
— 734-470 pooled blocks → PAETEC ITEL, LLC 829J SALINE MI
— 734-471 pooled blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROCKWOOD MI
— 734-472 pooled blocks → ONVOY, LLCV - MI 543C TRENTON MI
— 734-473 blocks → SPOK, INC. 6630 ANN ARBOR MI
— 734-474 blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ANN ARBOR MI
— 734-475 blocks → MICHIGAN BELL TEL CO 9323 CHELSEA MI
— 734-476 blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ANN ARBOR MI
— 734-477 blocks → MICHIGAN BELL TEL CO 9323 ANN ARBOR MI
— 734-478 blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 ANN ARBOR MI
— 734-479 pooled blocks → MICHIGAN BELL TEL CO 9323 WYANDOTTE MI
— 734-480 pooled blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-481 blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-482 blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-483 blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-484 blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-485 blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-486 pooled blocks → MICHIGAN BELL TEL CO 9323 WYANDOTTE MI
— 734-487 blocks → MICHIGAN BELL TEL CO 9323 YPSILANTI MI
— 734-489 pooled blocks → PAETEC ITEL, LLC 829J ANN ARBOR 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.