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 442

NEW CINGULAR WIRELESS PCS, LLC 1

CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 1

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
2024-02-20	442-437	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VICTORVL	CA
2024-02-14	442-436	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	BRAWLEY	CA
2024-01-30	442-434	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - CA	649C	INDIO	CA
2024-01-30	442-435	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - CA	649C	PALM SPG	CA
2024-01-11	442-431	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	EL CENTRO	CA
2023-12-04	442-240	0XXX1XXX2XXX · 2 holders which blocks →	FIVE9, INC.	598J	RAMONA	CA
2023-10-16	442-429	0XXX1XXX7XXX8XXX9XXX · 3 holders which blocks →	T-MOBILE USA, INC.	6529	YUCCA VLY	CA
2023-10-16	442-430	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	VISTA	CA
2023-10-04	442-419	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - CA	649C	VICTORVL	CA
2023-10-04	442-428	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - CA	649C	VTVL HSPR	CA
2023-09-26	442-395	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PALM SPG	CA
2023-08-28	442-417	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	CALIFORNCY	CA
2023-08-28	442-418	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PALMDESERT	CA
2023-08-22	442-427	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	OCSD CRLS	CA
2023-08-16	442-416	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	SAN MARCOS	CA
2023-08-11	442-414	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	VICTORVL	CA
2023-08-10	442-413	0XXX1XXX2XXX3XXX6XXX7XXX9XXX · 5 holders which blocks →	T-MOBILE USA, INC.	6529	ENCINITAS	CA
2023-08-09	442-412	0–9 XXXall 10 · 3 holders which blocks →	COMMIO, LLC	939H	BRAWLEY	CA
2023-06-22	442-410	3XXX4XXX · 2 holders which blocks →	ONVOY, LLC - CA	649C	KERNVILLE	CA
2023-06-16	442-405	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VTVL ADLN	CA
2023-06-16	442-407	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PALM SPG	CA
2023-06-16	442-409	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	CALEXICO	CA
2023-06-15	442-406	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VTVL APVY	CA
2023-05-31	442-403	0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks →	BOOST SUBSCRIBERCO L.L.C.	490J	DSERTHTSPG	CA
2023-05-31	442-404	0–9 XXXall 10 · 6 holders which blocks →	BOOST SUBSCRIBERCO L.L.C.	490J	VISTA	CA
2023-05-30	442-401	0–9 XXXall 10 · 2 holders which blocks →	BOOST SUBSCRIBERCO L.L.C.	490J	VICTORVL	CA
2023-04-12	442-397	0–9 XXXall 10 · 3 holders which blocks →	COMCAST PHONE OF CALIFORNIA, LLC	394L	PALMDESERT	CA
2023-04-12	442-421	4XXX5XXX which blocks →	ONVOY SPECTRUM, LLC	624H	LKISABELLA	CA
2023-04-12	442-425	0–9 XXXall 10 · 2 holders which blocks →	ONVOY SPECTRUM, LLC	624H	VICTORVL	CA
2023-04-12	442-426	0XXX2XXX4XXX5XXX9XXX · 4 holders which blocks →	ONVOY SPECTRUM, LLC	624H	WRIGHTWOOD	CA
2023-04-12	442-445	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks →	ONVOY SPECTRUM, LLC	624H	BISHOP	CA
2023-04-12	442-447	0XXX1XXX2XXX4XXX5XXX · 3 holders which blocks →	ONVOY SPECTRUM, LLC	624H	BORON	CA
2023-04-12	442-448	4XXX5XXX8XXX · 2 holders which blocks →	ONVOY SPECTRUM, LLC	624H	LENWOOD	CA
2023-02-10	442-396	0–9 XXXall 10 · 2 holders which blocks →	NUSO, LLC	732J	PALM SPG	CA
2022-11-03	442-393	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks →	COMMIO, LLC	939H	CALIPATRIA	CA
2022-10-21	442-392	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VICTORVL	CA
2022-10-21	442-398	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	VTVL HSPR	CA
2022-07-28	442-391	0XXX1XXX · 2 holders which blocks →	BOOST SUBSCRIBERCO L.L.C.	490J	WINTERHVN	CA
2022-07-14	442-390	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	ENCINITAS	CA
2022-07-13	442-387	4XXX5XXX which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	SALTON	CA
2022-07-11	442-384	0XXX7XXX · 2 holders which blocks →	ONVOY SPECTRUM, LLC	624H	DESERT CTR	CA
2022-06-29	442-374	0XXX1XXX2XXX3XXX · 2 holders which blocks →	COMMIO, LLC	939H	FALLBROOK	CA
2022-06-29	442-376	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	ESCONDIDO	CA
2022-06-29	442-383	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	DSERTHTSPG	CA
2022-05-26	442-371	0–9 XXXall 10 · 5 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	PALMDESERT	CA
2022-05-26	442-381	0–9 XXXall 10 · 6 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	INDIO	CA
2022-04-29	442-372	0–9 XXXall 10 · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	OCSD CRLS	CA
2022-03-07	442-420	0–9 XXXall 10 · 2 holders which blocks →	COMMIO, LLC	939H	PALM SPG	CA
2022-03-01	442-389	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	BLYTHE	CA
2022-02-28	442-378	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks →	T-MOBILE USA, INC.	6529	FALLBROOK	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.