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
2014-10-17	424-376	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	TORRANCE	CA
2014-10-08	424-374	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	HAWTHORNE	CA
2014-10-03	424-355	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	BEVERLYHLS	CA
2014-10-01	424-372	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	W ANGELES	CA
2014-09-30	424-373	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	CMTN CMTN	CA
2014-09-24	424-371	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	W ANGELES	CA
2014-09-19	424-367	0–9 XXXall 10 · 7 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	EL SEGUNDO	CA
2014-09-15	424-364	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	SAN PEDRO	CA
2014-09-09	424-361	0–9 XXXall 10 · 5 holders which blocks →	AT&T ENTERPRISES, LLC	516C	CULVERCITY	CA
2014-09-09	424-363	0–9 XXXall 10 · 3 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7139	BEVERLYHLS	CA
2014-09-02	424-344	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	CMTN GRDN	CA
2014-08-21	424-358	0–9 XXXall 10 · 7 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	TORRANCE	CA
2014-08-21	424-362	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	BEVERLYHLS	CA
2014-08-08	424-357	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7139	BEVERLYHLS	CA
2014-07-14	424-351	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	INGLEWOOD	CA
2014-07-07	424-356	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	INGLEWOOD	CA
2014-06-24	424-610	0–9 XXXall 10 · 7 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	7240	SNMN SNMN	CA
2014-05-22	424-352	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	REDONDO	CA
2014-05-02	424-348	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	HAWTHORNE	CA
2014-05-02	424-365	0–9 XXXall 10 · 7 holders which blocks →	ONVOY, LLC - CA	649C	W ANGELES	CA
2014-04-28	424-353	0–9 XXXall 10 · 5 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	SNMN MRVS	CA
2014-04-17	424-346	0–9 XXXall 10 · 8 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	MALIBU	CA
2014-04-11	424-347	0–9 XXXall 10 · 7 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	LOMITA	CA
2014-04-04	424-345	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	CULVERCITY	CA
2014-03-14	424-343	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	BEVERLYHLS	CA
2014-03-07	424-324	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	BEVERLYHLS	CA
2013-12-09	424-341	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	CULVERCITY	CA
2013-11-26	424-338	0–9 XXXall 10 · 6 holders which blocks →	PACIFIC BELL	9740	CMTN CMTN	CA
2013-11-15	424-337	0–9 XXXall 10 · 7 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7139	TORRANCE	CA
2013-11-13	424-334	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	AVALON	CA
2013-10-08	424-320	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	W ANGELES	CA
2013-10-01	424-325	0–9 XXXall 10 · 6 holders which blocks →	PEERLESS NETWORK OF CALIFORNIA, LLC - CA	373F	W ANGELES	CA
2013-08-22	424-335	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	BEVERLYHLS	CA
2013-08-08	424-329	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	CMTN GRDN	CA
2013-06-26	424-299	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	SNMN SNMN	CA
2013-06-17	424-321	0–9 XXXall 10 · 7 holders which blocks →	T-MOBILE USA, INC.	6529	EL SEGUNDO	CA
2013-06-13	424-302	0–9 XXXall 10 · 5 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	BEVERLYHLS	CA
2013-05-31	424-322	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	SNMN SNMN	CA
2013-05-16	424-332	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	BEVERLYHLS	CA
2013-04-26	424-331	0–9 XXXall 10 · 9 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	INGLEWOOD	CA
2013-04-01	424-296	0–9 XXXall 10 · 7 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	CMTN CMTN	CA
2013-02-15	424-295	0–9 XXXall 10 · 5 holders which blocks →	METROPCS NETWORKS, LLC	899D	CMTN GRDN	CA
2013-02-11	424-293	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	W ANGELES	CA
2013-02-04	424-291	0–9 XXXall 10 · 8 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	SNMN SNMN	CA
2013-02-04	424-292	0–9 XXXall 10 · 6 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	CMTN GRDN	CA
2013-02-04	424-297	0–9 XXXall 10 · 7 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	HAWTHORNE	CA
2013-02-04	424-328	0–9 XXXall 10 · 7 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	LOMITA	CA
2013-01-04	424-290	0–9 XXXall 10 · 9 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	EL SEGUNDO	CA
2012-12-17	424-289	0–9 XXXall 10 · 6 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	SNMN MRVS	CA
2012-12-14	424-287	0–9 XXXall 10 · 9 holders which blocks →	T-MOBILE USA, INC.	6529	SAN PEDRO	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.