Recent prefix assignments

2 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 661

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
2015-04-21	661-564	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA	7128	BKFD SOUTH	CA
2015-04-14	661-527	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	BKFD SOUTH	CA
2015-04-13	661-490	0–9 XXXall 10 · 3 holders which blocks →	METROPCS, INC.	5562	BKFD MAIN	CA
2015-03-09	661-421	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	BKFD MAIN	CA
2015-03-04	661-534	0–9 XXXall 10 · 4 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	DELANO	CA
2015-02-17	661-383	0–9 XXXall 10 · 6 holders which blocks →	PACIFIC BELL	9740	SNCA NHCS	CA
2015-02-16	661-546	0–9 XXXall 10 · 6 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	BKFD MAIN	CA
2015-02-09	661-522	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	LANCASTER	CA
2014-12-24	661-497	0–9 XXXall 10 · 2 holders which blocks →	METROPCS, INC.	5562	BKFD MAIN	CA
2014-12-22	661-488	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	LANCASTER	CA
2014-11-25	661-525	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	BKFD NORTH	CA
2014-10-14	661-445	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	LANCASTER	CA
2014-10-08	661-494	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	LANCASTER	CA
2014-10-08	661-523	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SNCA SGCC	CA
2014-06-24	661-483	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	LANCASTER	CA
2014-06-09	661-470	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	LANCASTER	CA
2014-05-07	661-520	0–9 XXXall 10 · 5 holders which blocks →	PEERLESS NETWORK OF CALIFORNIA, LLC - CA	373F	BKFD MAIN	CA
2014-04-25	661-493	0–9 XXXall 10 · 7 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	BKFD MAIN	CA
2014-04-22	661-489	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	BKFD MAIN	CA
2014-04-18	661-440	0–9 XXXall 10 · 3 holders which blocks →	METROPCS, INC.	5562	BKFD MAIN	CA
2014-04-07	661-372	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	DELANO	CA
2014-03-21	661-425	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	SNCA NHCS	CA
2014-03-21	661-486	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks →	METROPCS NETWORKS, LLC	899D	PLDL AGDL	CA
2014-03-21	661-556	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	BKFD SOUTH	CA
2014-01-08	661-485	0–9 XXXall 10 · 5 holders which blocks →	METROPCS NETWORKS, LLC	899D	PLDL PLDL	CA
2013-12-09	661-447	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	BKFD MAIN	CA
2013-03-12	661-482	4XXX which blocks →	TWC IP ENABLED SERVICES, LLC	793K	EDWARDS	CA
2013-03-12	661-941	0–9 XXXall 10 · 2 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	LANCASTER	CA
2013-03-09	661-481	0–9 XXXall 10 · 6 holders which blocks →	PEERLESS NETWORK OF CALIFORNIA, LLC - CA	373F	SNCA NHCS	CA
2013-02-01	661-441	0–9 XXXall 10 · 7 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	PLDL PLDL	CA
2013-02-01	661-471	0–9 XXXall 10 · 7 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	LANCASTER	CA
2013-01-29	661-473	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	BKFD SOUTH	CA
2013-01-14	661-426	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC - CA	649C	BKFD MAIN	CA
2012-11-06	661-448	0–9 XXXall 10 · 5 holders which blocks →	NUSO, LLC	551G	BKFD MAIN	CA
2012-09-24	661-429	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	LANCASTER	CA
2012-08-30	661-432	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	BKFD MAIN	CA
2012-08-28	661-437	0–9 XXXall 10 · 6 holders which blocks →	METROPCS, INC.	5562	BKFD MAIN	CA
2012-08-07	661-446	0–9 XXXall 10 · 5 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7139	DELANO	CA
2012-02-24	661-418	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	LANCASTER	CA
2011-11-11	661-434	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	PLDL PLDL	CA
2011-02-04	661-402	0–9 XXXall 10 · 4 holders which blocks →	METROPCS NETWORKS, LLC	899D	PLDL AGDL	CA
2010-08-16	661-388	0–9 XXXall 10 · 6 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	SNCA NHCS	CA
2010-08-11	661-401	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	BKFD MAIN	CA
2010-03-12	661-385	0XXX1XXX2XXX6XXX · 3 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7139	EDWARDS	CA
2010-03-05	661-474	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	DELANO	CA
2010-01-14	661-544	0–9 XXXall 10 · 3 holders which blocks →	METROPCS NETWORKS, LLC	899D	PLDL PLDL	CA
2009-12-14	661-436	0–9 XXXall 10 · 3 holders which blocks →	AT&T ENTERPRISES, LLC	516C	ARVIN	CA
2009-05-21	661-381	0–9 XXXall 10 · 4 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	BKFD SOUTH	CA
2009-04-28	661-379	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	BKFD MAIN	CA
2009-04-28	661-380	0–9 XXXall 10 · 4 holders which blocks →	RACE TELECOMMUNICATIONS, INC. - CA	973E	BKFD MAIN	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.