Recent prefix assignments

1 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 858

ONVOY, LLC - 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
2023-05-22	858-858	0–9 XXXwhole prefix which blocks →	ONVOY SPECTRUM, LLC	624H	SNDG SNDG	CA
2023-05-03	858-370	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	LA JOLLA	CA
2023-05-03	858-372	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	LA JOLLA	CA
2023-03-20	858-424	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - CA	649C	EL CAJON	CA
2023-03-10	858-340	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	LA JOLLA	CA
2023-01-20	858-398	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - CA	649C	SNDG MRMS	CA
2022-12-06	858-343	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	LA JOLLA	CA
2022-11-04	858-339	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	EL CAJON	CA
2022-11-03	858-363	0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks →	COMMIO, LLC	939H	JACUMBA	CA
2022-10-28	858-341	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	CHULAVISTA	CA
2022-10-20	858-351	0–9 XXXall 10 · 3 holders which blocks →	HD CARRIER LLC	321J	SNDG SNDG	CA
2022-10-10	858-331	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	CHULAVISTA	CA
2022-10-06	858-438	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - CA	649C	CHULAVISTA	CA
2022-10-04	858-326	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	CHULAVISTA	CA
2022-09-08	858-338	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - CA	649C	HARBSNALPN	CA
2022-07-21	858-379	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	EL CAJON	CA
2022-06-30	858-321	0–9 XXXall 10 · 4 holders which blocks →	PAETEC ITEL, LLC	829J	SNDG SNDG	CA
2022-05-27	858-318	0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	CHULAVISTA	CA
2022-05-10	858-838	0–9 XXXall 10 · 8 holders which blocks →	FRACTEL, LLC	965H	CAMPO	CA
2022-02-18	858-808	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	FRACTEL, LLC	965H	NATIONALCY	CA
2022-02-18	858-828	0–9 XXXall 10 · 5 holders which blocks →	FRACTEL, LLC	965H	SNDG SNDG	CA
2022-02-18	858-878	0–9 XXXall 10 · 5 holders which blocks →	FRACTEL, LLC	965H	LA MESA	CA
2022-02-18	858-898	0–9 XXXall 10 · 5 holders which blocks →	FRACTEL, LLC	965H	CORONADO	CA
2022-02-17	858-787	8XXX which blocks →	TON80 COMMUNICATIONS, LLC	516J	PINEVALLEY	CA
2022-01-19	858-665	0–9 XXXall 10 · 4 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	LA JOLLA	CA
2022-01-19	858-687	0–9 XXXall 10 · 5 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	POWAY	CA
2022-01-12	858-742	0–9 XXXall 10 · 4 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	SNDG LVTA	CA
2022-01-11	858-462	0–9 XXXall 10 · 4 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	NATIONALCY	CA
2022-01-11	858-463	0–9 XXXall 10 · 3 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	CHULAVISTA	CA
2021-11-30	858-533	0–9 XXXall 10 · 5 holders which blocks →	FRACTEL, LLC	965H	HARBSNALPN	CA
2021-11-18	858-330	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	RNCHOPNQTS	CA
2021-10-26	858-328	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	LA MESA	CA
2021-10-11	858-325	0–9 XXXall 10 · 4 holders which blocks →	ONVOY SPECTRUM, LLC	624H	SNDG LVTA	CA
2021-09-24	858-544	0–9 XXXall 10 · 3 holders which blocks →	FRACTEL, LLC	965H	RNCHOBRNDO	CA
2021-09-23	858-422	0–9 XXXall 10 · 5 holders which blocks →	FRACTEL, LLC	965H	CORONADO	CA
2021-09-23	858-644	0–9 XXXall 10 · 6 holders which blocks →	FRACTEL, LLC	965H	SNDG MRMS	CA
2021-09-22	858-355	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	SNDG SNDG	CA
2021-08-10	858-765	0–9 XXXall 10 · 4 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7147	LA JOLLA	CA
2021-08-05	858-844	0–9 XXXall 10 · 3 holders which blocks →	FRACTEL, LLC	965H	EL CAJON	CA
2021-08-05	858-933	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	DEL MAR	CA
2021-07-22	858-323	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	CHULAVISTA	CA
2021-07-13	858-377	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	POWAY	CA
2021-07-13	858-944	0–9 XXXall 10 · 6 holders which blocks →	FRACTEL, LLC	965H	SNDG LVTA	CA
2021-07-01	858-315	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	CHULAVISTA	CA
2021-07-01	858-316	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	CHULAVISTA	CA
2021-06-04	858-477	0–9 XXXall 10 · 5 holders which blocks →	FRACTEL, LLC	965H	SNDG SNDG	CA
2021-04-23	858-744	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	SNDG SNDG	CA
2021-04-23	858-855	0–9 XXXall 10 · 3 holders which blocks →	FRACTEL, LLC	965H	EL CAJON	CA
2021-04-22	858-567	0–9 XXXall 10 · 3 holders which blocks →	FRACTEL, LLC	965H	LA JOLLA	CA
2021-04-01	858-910	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - CA	649C	CHULAVISTA	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.