Recent prefix assignments

5 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 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
2012-11-15	951-364	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - CA	649C	HEMT SAGE	CA
2012-09-17	951-383	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	TEMECULA	CA
2012-08-28	951-355	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	PERRIS	CA
2012-01-24	951-338	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	TEMSCL CNY	CA
2011-08-24	951-337	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	MORENO	CA
2011-08-09	951-373	0–9 XXXall 10 · 8 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	ARLINGTON	CA
2011-07-25	951-335	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	RIVERSIDE	CA
2011-07-15	951-331	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	TEMECULA	CA
2011-04-12	951-221	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	MORENO	CA
2011-02-22	951-322	0–9 XXXall 10 · 4 holders which blocks →	MCC TELEPHONY OF THE WEST, LLC - CA	857F	PERRIS	CA
2011-02-15	951-309	0–9 XXXall 10 · 7 holders which blocks →	MCC TELEPHONY OF THE WEST, LLC - CA	857F	SUN CITY	CA
2010-11-19	951-298	0–9 XXXall 10 · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	CORONA	CA
2010-11-19	951-299	0–9 XXXall 10 · 8 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	ARLINGTON	CA
2010-09-08	951-305	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	HEMT HEMT	CA
2010-06-15	951-297	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	TEMECULA	CA
2010-06-09	951-292	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	HEMT SNJC	CA
2010-06-09	951-293	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	PERRIS	CA
2010-04-05	951-291	0–9 XXXall 10 · 7 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	ELSINORE	CA
2010-03-26	951-290	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	MURRIETA	CA
2010-02-09	951-842	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	MORENO	CA
2010-01-13	951-289	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	RIVERSIDE	CA
2010-01-08	951-330	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	HEMT HEMT	CA
2009-12-17	951-703	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	MIRA LOMA	CA
2009-11-30	951-525	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	ARLINGTON	CA
2009-09-23	951-287	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	PERRIS	CA
2009-09-03	951-286	0–9 XXXall 10 · 2 holders which blocks →	METROPCS NETWORKS, LLC	899D	RIVERSIDE	CA
2009-07-06	951-269	0–9 XXXall 10 · 4 holders which blocks →	METROPCS NETWORKS, LLC	899D	MORENO	CA
2009-02-26	951-268	0–9 XXXall 10 · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	7240	CORONA	CA
2009-02-21	951-267	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	ONVOY, LLC - CA	649C	BANNING	CA
2009-02-11	951-266	0–9 XXXall 10 · 2 holders which blocks →	PEERLESS NETWORK OF CALIFORNIA, LLC - CA	373F	RIVERSIDE	CA
2009-01-31	951-263	0–9 XXXall 10 · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	RIVERSIDE	CA
2009-01-08	951-262	0–9 XXXall 10 · 6 holders which blocks →	WIDE VOICE, LLC - CA	252F	HEMT ANZA	CA
2008-12-11	951-261	0–9 XXXall 10 · 4 holders which blocks →	METROPCS NETWORKS, LLC	899D	RIVERSIDE	CA
2008-08-05	951-251	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	MORENO	CA
2008-06-24	951-821	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - CA	649C	SUN CITY	CA
2008-05-28	951-595	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - CA	649C	TEMECULA	CA
2008-05-13	951-732	0–9 XXXall 10 · 3 holders which blocks →	METROPCS NETWORKS, LLC	899D	RIVERSIDE	CA
2008-05-02	951-392	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	HEMT HEMT	CA
2007-09-27	951-241	0–9 XXXall 10 · 5 holders which blocks →	METROPCS NETWORKS, LLC	899D	RIVERSIDE	CA
2007-09-27	951-249	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	MURRIETA	CA
2007-09-24	951-239	0–9 XXXall 10 · 5 holders which blocks →	METROPCS NETWORKS, LLC	899D	MURRIETA	CA
2007-09-15	951-238	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	PERRIS	CA
2007-09-11	951-229	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	PERRIS	CA
2007-09-11	951-230	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	PERRIS	CA
2007-09-11	951-234	0–9 XXXall 10 · 6 holders which blocks →	T-MOBILE USA, INC.	6529	TEMECULA	CA
2007-08-17	951-282	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	HEMT HEMT	CA
2007-08-17	951-496	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	CORONA	CA
2007-07-13	951-250	0–9 XXXwhole prefix which blocks →	METROPCS NETWORKS, LLC	899D	RIVERSIDE	CA
2007-06-07	951-227	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	CORONA	CA
2007-04-22	951-226	0–9 XXXall 10 · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	ELSINORE	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.