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)

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

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks — who really holds the numbers	Code holder	OCN	Rate center	State
—	734-490	Not yet reported which blocks →				MI
—	734-493	8 of 10 blocks assigned · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	TRENTON	MI
—	734-494	6 of 10 blocks assigned · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	ROMULUS	MI
—	734-495	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	YPSILANTI	MI
—	734-497	1 of 10 blocks assigned · 1 holder which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	MONROE	MI
—	734-498	6 of 10 blocks assigned · 3 holders which blocks →	FRONTIER MIDSTATES, INC. - MI	0681	GREGORY	MI
—	734-500	Not yet reported which blocks →				MI
—	734-501	Not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	DUNDEE	MI
—	734-502	Not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WAYNE	MI
—	734-503	Not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	SALINE	MI
—	734-504	Not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	WAYNE	MI
—	734-506	8 of 10 blocks assigned · 6 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - MI	770E	CARLETON	MI
—	734-507	5 of 10 blocks assigned · 1 holder which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	YPSILANTI	MI
—	734-508	8 of 10 blocks assigned · 6 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - MI	770E	MILAN	MI
—	734-509	Not yet reported which blocks →	SPOK, INC.	6630	ANN ARBOR	MI
—	734-511	Not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	MI
—	734-512	6 of 10 blocks assigned · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	TRENTON	MI
—	734-513	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	LIVONIA	MI
—	734-516	Not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WAYNE	MI
—	734-517	Not yet reported which blocks →				MI
—	734-518	5 of 10 blocks assigned · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	LIVONIA	MI
—	734-520	Not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	IDA	MI
—	734-521	8 of 10 blocks assigned · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	LIVONIA	MI
—	734-522	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	LIVONIA	MI
—	734-523	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	LIVONIA	MI
—	734-524	1 of 10 blocks assigned · 1 holder which blocks →	MICHIGAN BELL TEL CO	9323	LIVONIA	MI
—	734-525	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	LIVONIA	MI
—	734-526	9 of 10 blocks assigned · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	MILAN	MI
—	734-527	Not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	ANN ARBOR	MI
—	734-528	1 of 10 blocks assigned · 1 holder which blocks →	MICHIGAN BELL TEL CO	9323	YPSILANTI	MI
—	734-529	3 of 10 blocks assigned · 3 holders which blocks →	FRONTIER NORTH, INC. - MI	0695	DUNDEE	MI
—	734-530	7 of 10 blocks assigned · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	WYANDOTTE	MI
—	734-531	5 of 10 blocks assigned · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	ANN ARBOR	MI
—	734-532	6 of 10 blocks assigned · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	ROMULUS	MI
—	734-533	Not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	YPSILANTI	MI
—	734-534	Not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	LAMBERTVL	MI
—	734-535	7 of 10 blocks assigned · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	FLAT ROCK	MI
—	734-536	Not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	LIVONIA	MI
—	734-538	Not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	TEMPERANCE	MI
—	734-542	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	LIVONIA	MI
—	734-543	9 of 10 blocks assigned · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	NEW BOSTON	MI
—	734-544	3 of 10 blocks assigned · 2 holders which blocks →	MICHIGAN BELL TEL CO	9323	YPSILANTI	MI
—	734-545	9 of 10 blocks assigned · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	ANN ARBOR	MI
—	734-546	Not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	ANN ARBOR	MI
—	734-547	3 of 10 blocks assigned · 3 holders which blocks →	MICHIGAN BELL TEL CO	9323	YPSILANTI	MI
—	734-548	9 of 10 blocks assigned · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	ANN ARBOR	MI
—	734-549	Not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	ERIE	MI
—	734-551	9 of 10 blocks assigned · 2 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - MI	770E	NEW BOSTON	MI
—	734-552	Not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	WYANDOTTE	MI
—	734-553	Not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	GREGORY	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.