Recent prefix assignments

2 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 424

ONVOY, LLC - CA 2

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
2019-07-18	424-432	0–9 XXXall 10 · 6 holders which blocks →	VOIP INNOVATIONS, LLC	597F	AVALON	CA
2019-07-17	424-450	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SAN PEDRO	CA
2019-06-18	424-440	0–9 XXXall 10 · 6 holders which blocks →	T-MOBILE USA, INC.	6529	W ANGELES	CA
2019-05-28	424-435	0–9 XXXall 10 · 6 holders which blocks →	T-MOBILE USA, INC.	6529	TORRANCE	CA
2019-05-21	424-431	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	BEVERLYHLS	CA
2019-05-20	424-758	0–9 XXXall 10 · 5 holders which blocks →	FRACTEL, LLC	965H	CMTN CMTN	CA
2019-05-14	424-430	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	CMTN GRDN	CA
2019-05-10	424-429	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	CMTN CMTN	CA
2019-05-06	424-434	0–9 XXXall 10 · 7 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	CULVERCITY	CA
2019-05-01	424-499	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	EL SEGUNDO	CA
2019-04-04	424-428	0–9 XXXall 10 · 8 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	SNMN MRVS	CA
2019-02-08	424-422	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	MALIBU	CA
2019-02-05	424-427	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	CMTN CMTN	CA
2019-02-05	424-502	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	EL SEGUNDO	CA
2019-01-31	424-420	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	INGLEWOOD	CA
2018-10-30	424-426	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	7240	HAWTHORNE	CA
2018-07-31	424-418	not yet reported which blocks →	SHELCOMM	0051	BEVERLYHLS	CA
2018-07-03	424-417	0–9 XXXall 10 · 5 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	SAN PEDRO	CA
2018-05-15	424-413	0–9 XXXall 10 · 3 holders which blocks →	METROPCS NETWORKS, LLC	899D	SNMN SNMN	CA
2018-05-15	424-416	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SNMN SNMN	CA
2018-05-08	424-412	not yet reported which blocks →	SHELCOMM	0051	INGLEWOOD	CA
2018-04-16	424-407	0–9 XXXall 10 · 6 holders which blocks →	METROPCS NETWORKS, LLC	899D	W ANGELES	CA
2018-04-02	424-406	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	CMTN CMTN	CA
2018-03-22	424-409	0–9 XXXall 10 · 7 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	REDONDO	CA
2018-03-06	424-425	0–9 XXXall 10 · 7 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	MALIBU	CA
2018-01-26	424-419	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	7240	INGLEWOOD	CA
2018-01-12	424-559	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	7240	W ANGELES	CA
2018-01-10	424-489	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	SAN PEDRO	CA
2017-10-11	424-405	0–9 XXXall 10 · 7 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	EL SEGUNDO	CA
2017-10-03	424-410	0–9 XXXall 10 · 7 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	SNMN MRVS	CA
2017-09-28	424-401	0–9 XXXall 10 · 6 holders which blocks →	COMCAST PHONE OF CALIFORNIA, LLC	394L	LOMITA	CA
2017-09-01	424-323	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	TORRANCE	CA
2017-08-07	424-310	0–9 XXXall 10 · 5 holders which blocks →	METROPCS NETWORKS, LLC	899D	HAWTHORNE	CA
2017-06-30	424-404	0–9 XXXall 10 · 6 holders which blocks →	PEERLESS NETWORK OF CALIFORNIA, LLC - CA	373F	REDONDO	CA
2017-03-17	424-528	0–9 XXXall 10 · 6 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7139	CMTN GRDN	CA
2017-02-17	424-501	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - CA	649C	CULVERCITY	CA
2017-02-17	424-512	0–9 XXXall 10 · 7 holders which blocks →	PAETEC ITEL, LLC	829J	BEVERLYHLS	CA
2017-01-23	424-538	0–9 XXXall 10 · 8 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7139	SNMN SNMN	CA
2016-12-27	424-423	0–9 XXXall 10 · 7 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7139	EL SEGUNDO	CA
2016-12-15	424-414	0–9 XXXall 10 · 5 holders which blocks →	TELNYX LLC	073H	INGLEWOOD	CA
2016-11-21	424-399	0–9 XXXall 10 · 4 holders which blocks →	PEERLESS NETWORK OF CALIFORNIA, LLC - CA	373F	TORRANCE	CA
2016-11-02	424-403	0–9 XXXall 10 · 7 holders which blocks →	T-MOBILE USA, INC.	6529	CMTN CMTN	CA
2016-11-01	424-541	0–9 XXXall 10 · 6 holders which blocks →	AT&T ENTERPRISES, LLC	516C	INGLEWOOD	CA
2016-09-21	424-421	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	BEVERLYHLS	CA
2016-08-31	424-537	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	SNMN MRVS	CA
2016-08-29	424-390	0–9 XXXall 10 · 7 holders which blocks →	T-MOBILE USA, INC.	6529	REDONDO	CA
2016-07-22	424-402	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	W ANGELES	CA
2016-07-18	424-380	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - CA	649C	INGLEWOOD	CA
2016-06-29	424-319	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	CMTN GRDN	CA
2016-06-28	424-366	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	CMTN CMTN	CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.