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
—	734-645	Not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	ANN ARBOR	MI
—	734-646	Not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	ANN ARBOR	MI
—	734-647	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	ANN ARBOR	MI
—	734-648	9 of 10 blocks assigned · 6 holders which blocks →	ONVOY, LLCV - MI	543C	PINCKNEY	MI
—	734-649	Not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	ANN ARBOR	MI
—	734-651	Not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	ANN ARBOR	MI
—	734-652	1 of 10 blocks assigned · 1 holder which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	MONROE	MI
—	734-654	1 of 10 blocks assigned · 1 holder which blocks →	MICHIGAN BELL TEL CO	9323	CARLETON	MI
—	734-655	4 of 10 blocks assigned · 3 holders which blocks →	MICHIGAN BELL TEL CO	9323	LIVONIA	MI
—	734-656	2 of 10 blocks assigned · 2 holders which blocks →	PAETEC ITEL, LLC	829J	PLYMOUTH	MI
—	734-657	0 of 10 blocks assigned · 0 holders which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	ANN ARBOR	MI
—	734-658	0 of 10 blocks assigned · 0 holders which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	WAYNE	MI
—	734-659	8 of 10 blocks assigned · 6 holders which blocks →	PAETEC ITEL, LLC	829J	ERIE	MI
—	734-660	Not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	ANN ARBOR	MI
—	734-661	1 of 10 blocks assigned · 1 holder which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	ANN ARBOR	MI
—	734-662	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	ANN ARBOR	MI
—	734-663	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	ANN ARBOR	MI
—	734-664	Not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	WAYNE	MI
—	734-665	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	ANN ARBOR	MI
—	734-666	9 of 10 blocks assigned · 6 holders which blocks →	MICHIGAN BELL TEL CO	9323	LIVONIA	MI
—	734-667	5 of 10 blocks assigned · 2 holders which blocks →	COMCAST IP PHONE, LLC	318J	PLYMOUTH	MI
—	734-668	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	ANN ARBOR	MI
—	734-669	2 of 10 blocks assigned · 2 holders which blocks →	MICHIGAN BELL TEL CO	9323	ANN ARBOR	MI
—	734-670	Not yet reported which blocks →	AMERICAN MESSAGING SERVICES, LLC	9748	ANN ARBOR	MI
—	734-671	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	TRENTON	MI
—	734-672	9 of 10 blocks assigned · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI	7279	TRENTON	MI
—	734-673	0 of 10 blocks assigned · 0 holders which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	WAYNE	MI
—	734-674	0 of 10 blocks assigned · 0 holders which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	WAYNE	MI
—	734-675	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	TRENTON	MI
—	734-676	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	TRENTON	MI
—	734-677	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	ANN ARBOR	MI
—	734-678	0 of 10 blocks assigned · 0 holders which blocks →	OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC	2964	ANN ARBOR	MI
—	734-679	Not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	LIVONIA	MI
—	734-680	9 of 10 blocks assigned · 5 holders which blocks →	METROPCS, INC.	5562	ANN ARBOR	MI
—	734-681	7 of 10 blocks assigned · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - MI	6120	MILAN	MI
—	734-682	10 of 10 blocks assigned · 7 holders which blocks →	ONVOY SPECTRUM, LLC	624H	MONROE	MI
—	734-687	Not yet reported which blocks →	TELNET WORLDWIDE, INC.	817J	MONROE	MI
—	734-688	10 of 10 blocks assigned · 3 holders which blocks →	ONVOY, LLCV - MI	543C	PINCKNEY	MI
—	734-689	8 of 10 blocks assigned · 1 holder which blocks →	PAETEC ITEL, LLC	829J	WHITMORELK	MI
—	734-692	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	TRENTON	MI
—	734-693	2 of 10 blocks assigned · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MONROE	MI
—	734-694	5 of 10 blocks assigned · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI	6003	WHITMORELK	MI
—	734-697	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	BELLEVILLE	MI
—	734-699	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	BELLEVILLE	MI
—	734-700	Not yet reported which blocks →				MI
—	734-710	5 of 10 blocks assigned · 1 holder which blocks →	BANDWIDTH.COM CLEC, LLC - MI	991E	WAYNE	MI
—	734-711	Not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	MI
—	734-712	Not yet reported which blocks →	MICHIGAN BELL TEL CO	9323	YPSILANTI	MI
—	734-713	2 of 10 blocks assigned · 2 holders which blocks →	PAETEC ITEL, LLC	829J	WAYNE	MI
—	734-714	3 of 10 blocks assigned · 2 holders which blocks →	PAETEC ITEL, LLC	829J	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.