Recent prefix assignments

5 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 951

ONVOY, LLC - CA 5

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
2019-02-11	951-481	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	WOODCREST	CA
2018-12-24	951-477	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	MURRIETA	CA
2018-08-21	951-470	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	ARLINGTON	CA
2018-07-31	951-469	not yet reported which blocks →	SHELCOMM	0051	TEMECULA	CA
2018-06-12	951-518	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	MORENO	CA
2018-05-15	951-460	0–9 XXXall 10 · 8 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	CORONA	CA
2018-05-15	951-502	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	HEMT HEMT	CA
2018-05-09	951-451	0–9 XXXall 10 · 3 holders which blocks →	METROPCS NETWORKS, LLC	899D	HEMT SNJC	CA
2018-04-16	951-450	0–9 XXXall 10 · 5 holders which blocks →	METROPCS NETWORKS, LLC	899D	PERRIS	CA
2018-03-22	951-822	0–9 XXXall 10 · 2 holders which blocks →	METROPCS NETWORKS, LLC	899D	PERRIS	CA
2018-01-24	951-512	0–9 XXXall 10 · 4 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7139	RIVERSIDE	CA
2017-11-08	951-459	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	ELSINORE	CA
2017-10-19	951-449	0–9 XXXall 10 · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	PERRIS	CA
2017-08-07	951-419	0–9 XXXall 10 · 5 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	MORENO	CA
2017-03-23	951-758	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - CA	649C	RIVERSIDE	CA
2017-02-27	951-524	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	BANNING	CA
2016-12-30	951-466	0–9 XXXall 10 · 7 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	TEMECULA	CA
2016-12-19	951-783	0–9 XXXall 10 · 6 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	RIVERSIDE	CA
2016-12-01	951-441	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	ARLINGTON	CA
2016-11-15	951-418	0–9 XXXall 10 · 6 holders which blocks →	T-MOBILE USA, INC.	6529	PERRIS	CA
2016-10-11	951-417	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC - CA	649C	MURRIETA	CA
2016-10-10	951-497	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	MORENO	CA
2016-09-21	951-495	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7139	RIVERSIDE	CA
2016-08-25	951-416	0–9 XXXall 10 · 8 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	MIRA LOMA	CA
2016-08-25	951-494	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	7240	IDYLLWILD	CA
2016-08-22	951-439	0–9 XXXall 10 · 8 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	HEMT SAGE	CA
2016-08-15	951-414	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	TEMECULA	CA
2016-08-09	951-410	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	RIVERSIDE	CA
2016-07-19	951-478	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	MORENO	CA
2016-07-01	951-409	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	ELSINORE	CA
2016-06-29	951-484	0–9 XXXall 10 · 7 holders which blocks →	T-MOBILE USA, INC.	6529	HEMT HEMT	CA
2016-06-08	951-483	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PERRIS	CA
2016-05-27	951-430	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	SUN CITY	CA
2016-05-16	951-412	0–9 XXXall 10 · 5 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	MURRIETA	CA
2016-03-28	951-407	0–9 XXXall 10 · 7 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	CORONA	CA
2016-03-18	951-406	0–9 XXXall 10 · 5 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	ARLINGTON	CA
2016-03-04	951-405	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	RIVERSIDE	CA
2016-02-05	951-404	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - CA	649C	TEMECULA	CA
2015-09-22	951-401	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	TEMECULA	CA
2015-09-21	951-467	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	HEMT HMLD	CA
2015-09-16	951-476	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	ARLINGTON	CA
2015-09-11	951-421	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	MORENO	CA
2015-09-08	951-455	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	MORENO	CA
2015-08-14	951-391	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	HEMT HEMT	CA
2015-07-27	951-475	0–9 XXXall 10 · 7 holders which blocks →	T-MOBILE USA, INC.	6529	CORONA	CA
2015-07-24	951-420	0–9 XXXall 10 · 6 holders which blocks →	T-MOBILE USA, INC.	6529	PERRIS	CA
2015-07-20	951-458	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	SUN CITY	CA
2015-06-09	951-482	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	CORONA	CA
2015-06-04	951-474	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	HEMT SNJC	CA
2015-05-14	951-429	0–9 XXXall 10 · 8 holders which blocks →	AT&T ENTERPRISES, LLC	516C	WOODCREST	CA

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.