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

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Assignee	OCN	Rate center	State
—	734-370 blocks →	TELNET WORLDWIDE, INC.	817J	LAMBERTVL	MI
—	734-372 blocks →	TELNET WORLDWIDE, INC.	817J	ANN ARBOR	MI
—	734-374 pooled blocks →	MICHIGAN BELL TEL CO	9323	WYANDOTTE	MI
—	734-375 pooled blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - MI	770E	GREGORY	MI
—	734-376 blocks →	TELNET WORLDWIDE, INC.	817J	IDA	MI
—	734-377 pooled blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	WAYNE	MI
—	734-378 pooled blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	DEXTER	MI
—	734-379 blocks →	MICHIGAN BELL TEL CO	9323	ROCKWOOD	MI
—	734-380 blocks →	SPOK, INC.	6630	ROMULUS	MI
—	734-382 pooled blocks →	PAETEC ITEL, LLC	829J	GREGORY	MI
—	734-383 pooled blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	YPSILANTI	MI
—	734-384 pooled blocks →	MICHIGAN BELL TEL CO	9323	MONROE	MI
—	734-385 pooled blocks →	PAETEC ITEL, LLC	829J	CHELSEA	MI
—	734-387 blocks →	TELNET WORLDWIDE, INC.	817J	TEMPERANCE	MI
—	734-389 pooled blocks →	PAETEC ITEL, LLC	829J	ANN ARBOR	MI
—	734-390 pooled blocks →	PAETEC ITEL, LLC	829J	YPSILANTI	MI
—	734-391 pooled blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - MI	770E	BELLEVILLE	MI
—	734-392 pooled blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - MI	770E	PLYMOUTH	MI
—	734-393 pooled blocks →	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	LOSTPNNSUL	MI
—	734-394 pooled blocks →	MICHIGAN BELL TEL CO	9323	WAYNE	MI
—	734-395 blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	ANN ARBOR	MI
—	734-396 pooled blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - MI	770E	MANCHESTER	MI
—	734-397 blocks →	MICHIGAN BELL TEL CO	9323	WAYNE	MI
—	734-398 pooled blocks →	MICHIGAN BELL TEL CO	9323	WAYNE	MI
—	734-399 pooled blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - MI	770E	MAYBEE	MI
—	734-401 blocks →	TELNET WORLDWIDE, INC.	817J	SALINE	MI
—	734-402 pooled blocks →	PAETEC ITEL, LLC	829J	LIVONIA	MI
—	734-403 pooled blocks →	PAETEC ITEL, LLC	829J	ROMULUS	MI
—	734-404 pooled blocks →	PAETEC ITEL, LLC	829J	PLYMOUTH	MI
—	734-405 pooled blocks →	PAETEC ITEL, LLC	829J	WAYNE	MI
—	734-407 pooled blocks →	PAETEC ITEL, LLC	829J	WYANDOTTE	MI
—	734-408 pooled blocks →	PAETEC ITEL, LLC	829J	DEXTER	MI
—	734-411 blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	MI
—	734-413 pooled blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	ROMULUS	MI
—	734-414 pooled blocks →	MICHIGAN BELL TEL CO	9323	PLYMOUTH	MI
—	734-415 pooled blocks →	PAETEC ITEL, LLC	829J	NEW BOSTON	MI
—	734-416 blocks →	MICHIGAN BELL TEL CO	9323	PLYMOUTH	MI
—	734-417 blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	ANN ARBOR	MI
—	734-419 pooled blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	WAYNE	MI
—	734-420 pooled blocks →	MICHIGAN BELL TEL CO	9323	PLYMOUTH	MI
—	734-421 blocks →	MICHIGAN BELL TEL CO	9323	LIVONIA	MI
—	734-422 blocks →	MICHIGAN BELL TEL CO	9323	LIVONIA	MI
—	734-423 pooled blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	WAYNE	MI
—	734-424 pooled blocks →	MICHIGAN BELL TEL CO	9323	DEXTER	MI
—	734-425 blocks →	MICHIGAN BELL TEL CO	9323	LIVONIA	MI
—	734-426 blocks →	MICHIGAN BELL TEL CO	9323	DEXTER	MI
—	734-427 blocks →	MICHIGAN BELL TEL CO	9323	LIVONIA	MI
—	734-428 pooled blocks →	MICHIGAN BELL TEL CO	9323	MANCHESTER	MI
—	734-429 blocks →	FRONTIER NORTH, INC. - MI	0695	SALINE	MI
—	734-432 blocks →	MICHIGAN BELL TEL CO	9323	LIVONIA	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.