Recent prefix assignments

2 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 — NPA 571

ONVOY, LLC - VA 1

OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 1

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 taken (last-4 opening)	Code holder	OCN	Rate center	State
2013-07-16	571-253	0–9 XXXall 10 · 5 holders which blocks →	METROPCS, INC.	5562	WSNGTNZN17	VA
2013-05-24	571-758	0–9 XXXall 10 · 4 holders which blocks →	METROPCS, INC.	5562	DULLES	VA
2013-05-16	571-551	0–9 XXXall 10 · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	WSNGTNZN08	VA
2013-05-13	571-699	0–9 XXXall 10 · 6 holders which blocks →	NUSO, LLC	551G	WSNGTNZN08	VA
2013-01-21	571-326	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	WSNGTNZN17	VA
2013-01-18	571-620	0–9 XXXall 10 · 7 holders which blocks →	PEERLESS NETWORK OF VIRGINIA, LLC - VA	275G	WSNGTNZN17	VA
2013-01-15	571-424	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	WSNGTNZN17	VA
2012-12-26	571-348	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - VA	079F	LORTON	VA
2012-12-24	571-364	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	MANASSAS	VA
2012-11-20	571-386	0–9 XXXall 10 · 7 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	WSNGTNZN19	VA
2012-11-20	571-458	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	WSNGTNZN08	VA
2012-11-19	571-395	0–9 XXXall 10 · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	WSNGTNZN17	VA
2012-11-16	571-302	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	WSNGTNZN08	VA
2012-11-16	571-550	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	WSNGTNZN17	VA
2012-10-12	571-982	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	WSNGTNZN08	VA
2012-09-04	571-623	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	WSNGTNZN17	VA
2012-08-29	571-414	0–9 XXXall 10 · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	WSNGTNZN08	VA
2012-08-13	571-398	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	OCCOQUAN	VA
2012-07-25	571-781	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - VA	079F	NOKESVILLE	VA
2012-06-13	571-375	0–9 XXXall 10 · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	HERNDON	VA
2012-04-23	571-581	0–9 XXXall 10 · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	WSNGTNZN17	VA
2012-04-06	571-428	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	MANASSAS	VA
2012-02-10	571-298	0–9 XXXall 10 · 8 holders which blocks →	METROPCS, INC.	5562	DALE CITY	VA
2012-01-25	571-441	0–9 XXXall 10 · 2 holders which blocks →	PEERLESS NETWORK OF VIRGINIA, LLC - VA	275G	HERNDON	VA
2011-12-05	571-254	0–9 XXXwhole prefix which blocks →	LEVEL 3 COMMUNICATIONS, LLC - VA	8825	TRIANGLE	VA
2011-11-21	571-328	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	WSNGTNZN19	VA
2011-11-21	571-353	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	HERNDON	VA
2011-11-21	571-733	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	WSNGTNZN08	VA
2011-11-21	571-835	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	WSNGTNZN17	VA
2011-09-15	571-367	0–9 XXXall 10 · 8 holders which blocks →	VERIZON SOUTH, INC. - VA (CONTEL)	0233	ARCOLA	VA
2011-09-12	571-392	0–9 XXXall 10 · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	HERNDON	VA
2011-09-01	571-385	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - VA	079F	WSNGTNZN17	VA
2011-09-01	571-418	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - VA	079F	WSNGTNZN19	VA
2011-08-22	571-383	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	MANASSAS	VA
2011-08-12	571-359	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	MANASSAS	VA
2011-05-25	571-553	0–9 XXXwhole prefix which blocks →	PAETEC ITEL, LLC	829J	LEESBURG	VA
2011-05-13	571-447	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	WSNGTNZN08	VA
2011-05-10	571-388	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - VA	8825	WSNGTNZN08	VA
2011-04-12	571-492	0–9 XXXall 10 · 7 holders which blocks →	COMCAST IP PHONE, LLC	318J	OCCOQUAN	VA
2011-04-12	571-542	0–9 XXXwhole prefix which blocks →	COMCAST IP PHONE, LLC	318J	DALE CITY	VA
2011-04-08	571-419	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	WSNGTNZN17	VA
2011-04-08	571-512	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	WSNGTNZN19	VA
2011-02-09	571-429	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	WSNGTNZN08	VA
2011-02-08	571-477	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	OCCOQUAN	VA
2011-02-03	571-535	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	MANASSAS	VA
2011-01-11	571-442	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	LEESBURG	VA
2010-12-21	571-421	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - VA	8825	WSNGTNZN17	VA
2010-12-21	571-533	0–9 XXXall 10 · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	WSNGTNZN17	VA
2010-11-24	571-372	0–9 XXXwhole prefix which blocks →	VERIZON VIRGINIA, INC.	9213	WSNGTNZN08	VA
2010-11-24	571-858	0–9 XXXall 10 · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	WSNGTNZN08	VA

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.