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
—	734-554	9 of 10 blocks assigned · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	WILLIS	MI
—	734-555	Not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	DIR ASST	MI
—	734-556	7 of 10 blocks assigned · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	WYANDOTTE	MI
—	734-557	8 of 10 blocks assigned · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	YPSILANTI	MI
—	734-558	Not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	WYANDOTTE	MI
—	734-559	5 of 10 blocks assigned · 4 holders which blocks →	PAETEC ITEL, LLC	829J	TRENTON	MI
—	734-560	0 of 10 blocks assigned · 0 holders which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	WAYNE	MI
—	734-561	4 of 10 blocks assigned · 4 holders which blocks →	PAETEC ITEL, LLC	829J	TRENTON	MI
—	734-562	8 of 10 blocks assigned · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	CHELSEA	MI
—	734-564	0 of 10 blocks assigned · 0 holders which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	PLYMOUTH	MI
—	734-566	Not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	PLYMOUTH	MI
—	734-567	9 of 10 blocks assigned · 3 holders which blocks →	PAETEC ITEL, LLC	829J	WILLIS	MI
—	734-571	Not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	TRENTON	MI
—	734-572	1 of 10 blocks assigned · 1 holder which blocks →	MICHIGAN BELL TEL CO	9323	YPSILANTI	MI
—	734-573	Not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	YPSILANTI	MI
—	734-574	Not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	WYANDOTTE	MI
—	734-576	2 of 10 blocks assigned · 1 holder which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	YPSILANTI	MI
—	734-578	9 of 10 blocks assigned · 2 holders which blocks →	WOW! INTERNET, CABLE AND PHONE	961J	WAYNE	MI
—	734-582	2 of 10 blocks assigned · 2 holders which blocks →	MICHIGAN BELL TEL CO	9323	PLYMOUTH	MI
—	734-585	9 of 10 blocks assigned · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	ANN ARBOR	MI
—	734-586	Not yet reported which blocks →	BRIGHTSPEED OF MICHIGAN, LLC	0702	NEWPORT	MI
—	734-587	5 of 10 blocks assigned · 2 holders which blocks →	FRONTIER NORTH, INC. - MI	0695	MAYBEE	MI
—	734-588	2 of 10 blocks assigned · 1 holder which blocks →	123.NET, LLC	2550	WILLIS	MI
—	734-591	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	LIVONIA	MI
—	734-592	7 of 10 blocks assigned · 1 holder which blocks →	XO COMMUNICATIONS SERVICES, INC. - MI	4125	NEW BOSTON	MI
—	734-593	9 of 10 blocks assigned · 6 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - MI	770E	CHELSEA	MI
—	734-595	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	WAYNE	MI
—	734-604	Not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	ANN ARBOR	MI
—	734-610	9 of 10 blocks assigned · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	WILLIS	MI
—	734-611	Not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	MI
—	734-612	Not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WAYNE	MI
—	734-615	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	ANN ARBOR	MI
—	734-616	Not yet reported which blocks →				MI
—	734-621	8 of 10 blocks assigned · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	MONROE	MI
—	734-622	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	ANN ARBOR	MI
—	734-623	3 of 10 blocks assigned · 3 holders which blocks →	MICHIGAN BELL TEL CO	9323	ANN ARBOR	MI
—	734-625	Not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	MONROE	MI
—	734-626	Not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	WYANDOTTE	MI
—	734-627	7 of 10 blocks assigned · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	CHELSEA	MI
—	734-628	7 of 10 blocks assigned · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	MILAN	MI
—	734-629	8 of 10 blocks assigned · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	WAYNE	MI
—	734-632	1 of 10 blocks assigned · 1 holder which blocks →	MICHIGAN BELL TEL CO	9323	LIVONIA	MI
—	734-633	Not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	NEW BOSTON	MI
—	734-634	Not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	LIVONIA	MI
—	734-635	Not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	YPSILANTI	MI
—	734-638	Not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	WYANDOTTE	MI
—	734-639	10 of 10 blocks assigned · 6 holders which blocks →	PAETEC ITEL, LLC	829J	MONROE	MI
—	734-641	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	WAYNE	MI
—	734-642	8 of 10 blocks assigned · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	TRENTON	MI
—	734-644	Not yet reported which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	YPSILANTI	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.