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
2019-02-14	571-559	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - VA	079F	ENGLESIDE	VA
2018-11-27	571-669	0–9 XXXall 10 · 4 holders which blocks →	VONAGE AMERICA LLC	197D	WSNGTNZN19	VA
2018-11-21	571-412	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	OCCOQUAN	VA
2018-11-15	571-401	0–9 XXXall 10 · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	HERNDON	VA
2018-09-26	571-397	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	WSNGTNZN08	VA
2018-09-26	571-634	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	WSNGTNZN17	VA
2018-09-26	571-685	0–9 XXXall 10 · 6 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	HERNDON	VA
2018-09-24	571-396	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - VA	079F	WSNGTNZN19	VA
2018-08-28	571-500	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - VA	138E	HERNDON	VA
2018-07-05	571-394	0–9 XXXall 10 · 6 holders which blocks →	METROPCS, INC.	5562	TRIANGLE	VA
2018-07-05	571-404	0–9 XXXall 10 · 8 holders which blocks →	NUSO, LLC	551G	BRADDOCK	VA
2018-06-26	571-360	0–9 XXXall 10 · 5 holders which blocks →	CORETEL VIRGINIA, LLC - VA	5832	INDENDNTHL	VA
2018-06-26	571-370	0–9 XXXall 10 · 5 holders which blocks →	CORETEL VIRGINIA, LLC - VA	5832	ARCOLA	VA
2018-06-26	571-380	0–9 XXXall 10 · 5 holders which blocks →	CORETEL VIRGINIA, LLC - VA	5832	LORTON	VA
2018-06-26	571-390	0–9 XXXall 10 · 3 holders which blocks →	CORETEL VIRGINIA, LLC - VA	5832	NOKESVILLE	VA
2018-06-14	571-619	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	MANASSAS	VA
2018-06-11	571-523	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	HERNDON	VA
2018-06-08	571-391	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - DC	7529	WSNGTNZN19	VA
2018-06-01	571-387	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	HERNDON	VA
2018-05-30	571-347	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - VA	8825	WSNGTNZN08	VA
2018-04-12	571-649	0–9 XXXwhole prefix which blocks →	VERIZON VIRGINIA, INC.	9213	WSNGTNZN19	VA
2018-03-19	571-636	0–9 XXXall 10 · 7 holders which blocks →	BANDWIDTH.COM CLEC, LLC - VA	079F	HAYMARKET	VA
2018-03-07	571-595	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	WSNGTNZN19	VA
2018-03-02	571-310	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - VA	079F	WSNGTNZN19	VA
2018-02-06	571-417	0–9 XXXall 10 · 7 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	LEESBURG	VA
2018-01-17	571-752	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	HERNDON	VA
2018-01-11	571-508	0–9 XXXall 10 · 2 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	HERNDON	VA
2018-01-11	571-662	0–9 XXXall 10 · 3 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	MANASSAS	VA
2017-11-22	571-300	0–9 XXXall 10 · 6 holders which blocks →	METROPCS, INC.	5562	DALE CITY	VA
2017-09-29	571-495	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - VA	8825	WSNGTNZN19	VA
2017-09-28	571-666	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC - VA	138E	WSNGTNZN17	VA
2017-09-26	571-491	0–9 XXXall 10 · 7 holders which blocks →	METROPCS, INC.	5562	DULLES	VA
2017-09-18	571-362	0–9 XXXwhole prefix which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	HERNDON	VA
2017-09-14	571-616	0–9 XXXall 10 · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	ENGLESIDE	VA
2017-09-01	571-378	0–9 XXXall 10 · 6 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	WSNGTNZN17	VA
2017-09-01	571-443	0–9 XXXall 10 · 5 holders which blocks →	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	6855	HERNDON	VA
2017-08-14	571-509	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - DC	4036	LEESBURG	VA
2017-08-11	571-515	0–9 XXXwhole prefix which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	ENGLESIDE	VA
2017-08-02	571-361	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	MANASSAS	VA
2017-07-31	571-324	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	HERNDON	VA
2017-07-24	571-651	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	WSNGTNZN17	VA
2017-05-19	571-867	0–9 XXXall 10 · 4 holders which blocks →	COMMIO, LLC	939H	WSNGTNZN08	VA
2017-04-10	571-369	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	WSNGTNZN17	VA
2017-03-14	571-660	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC - VA	138E	TRIANGLE	VA
2017-03-08	571-655	0–9 XXXall 10 · 6 holders which blocks →	TELNYX LLC	073H	BRADDOCK	VA
2016-12-29	571-368	0–9 XXXall 10 · 5 holders which blocks →	METROPCS, INC.	5562	DALE CITY	VA
2016-10-27	571-767	0–9 XXXwhole prefix which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	ENGLESIDE	VA
2016-09-26	571-371	0–9 XXXall 10 · 5 holders which blocks →	PAETEC ITEL, LLC	829J	WSNGTNZN08	VA
2016-08-18	571-799	0–9 XXXall 10 · 6 holders which blocks →	PEERLESS NETWORK OF VIRGINIA, LLC - VA	275G	LEESBURG	VA
2016-07-11	571-457	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA	6827	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.