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
2015-04-13	951-464	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	PERRIS	CA
2015-04-06	951-563	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	MORENO	CA
2015-03-20	951-772	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	ARLINGTON	CA
2015-03-11	951-447	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	MURRIETA	CA
2015-03-09	951-438	0–9 XXXall 10 · 6 holders which blocks →	T-MOBILE USA, INC.	6529	HEMT HEMT	CA
2015-03-09	951-448	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	PERRIS	CA
2015-03-09	951-463	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	CORONA	CA
2015-02-18	951-462	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	RIVERSIDE	CA
2015-02-16	951-433	0–9 XXXall 10 · 7 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	TEMSCL CNY	CA
2015-02-16	951-457	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	ELSINORE	CA
2015-01-12	951-456	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	MIRA LOMA	CA
2015-01-09	951-422	0–9 XXXall 10 · 5 holders which blocks →	METROPCS NETWORKS, LLC	899D	PERRIS	CA
2014-12-15	951-446	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	ARLINGTON	CA
2014-11-04	951-437	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	PERRIS	CA
2014-10-27	951-523	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	CORONA	CA
2014-10-20	951-472	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	MORENO	CA
2014-10-13	951-428	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	TEMECULA	CA
2014-09-24	951-434	0–9 XXXall 10 · 3 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7139	SUN CITY	CA
2014-09-22	951-425	0–9 XXXall 10 · 3 holders which blocks →	METROPCS NETWORKS, LLC	899D	RIVERSIDE	CA
2014-09-03	951-397	0–9 XXXall 10 · 7 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	MURRIETA	CA
2014-08-25	951-390	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	HEMT HEMT	CA
2014-07-07	951-423	0–9 XXXall 10 · 5 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	PERRIS	CA
2014-06-10	951-396	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	ARLINGTON	CA
2014-05-23	951-394	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	RIVERSIDE	CA
2014-04-04	951-388	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	HEMT HMLD	CA
2014-03-24	951-395	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	TEMECULA	CA
2014-03-07	951-432	0–9 XXXall 10 · 6 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	CORONA	CA
2013-12-24	951-381	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	BANNING	CA
2013-12-04	951-393	0–9 XXXall 10 · 7 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	7240	CORONA	CA
2013-11-19	951-387	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	7240	MURRIETA	CA
2013-10-15	951-380	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	HEMT HEMT	CA
2013-10-15	951-435	0–9 XXXall 10 · 7 holders which blocks →	LEVEL 3 TELECOM OF CALIFORNIA, LP - CA	7718	PERRIS	CA
2013-10-08	951-384	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	RIVERSIDE	CA
2013-08-16	951-386	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	WOODCREST	CA
2013-06-12	951-379	0–9 XXXall 10 · 5 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	MORENO	CA
2013-04-24	951-376	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	ARLINGTON	CA
2013-04-08	951-374	0–9 XXXall 10 · 7 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	RIVERSIDE	CA
2013-03-29	951-370	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	SUN CITY	CA
2013-03-27	951-399	0–9 XXXall 10 · 5 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	ELSINORE	CA
2013-03-25	951-366	0–9 XXXall 10 · 5 holders which blocks →	PEERLESS NETWORK OF CALIFORNIA, LLC - CA	373F	LAKEVIEWNU	CA
2013-03-22	951-350	0–9 XXXall 10 · 6 holders which blocks →	PEERLESS NETWORK OF CALIFORNIA, LLC - CA	373F	HEMT SNJC	CA
2013-03-22	951-357	0–9 XXXall 10 · 6 holders which blocks →	PEERLESS NETWORK OF CALIFORNIA, LLC - CA	373F	HEMT HEMT	CA
2013-03-22	951-365	0–9 XXXall 10 · 4 holders which blocks →	PEERLESS NETWORK OF CALIFORNIA, LLC - CA	373F	TEMECULA	CA
2013-03-22	951-981	0–9 XXXall 10 · 5 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	LAKEVIEWNU	CA
2013-03-12	951-923	0–9 XXXall 10 · 5 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	HEMT HMLD	CA
2013-02-21	951-349	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	PERRIS	CA
2013-02-04	951-339	0–9 XXXall 10 · 7 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	CORONA	CA
2013-02-04	951-363	0–9 XXXall 10 · 7 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	MORENO	CA
2013-01-14	951-319	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	MURRIETA	CA
2012-11-16	951-228	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	ELSINORE	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.