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
2021-03-24	858-319	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	LA JOLLA	CA
2021-03-16	858-466	0–9 XXXall 10 · 3 holders which blocks →	FRACTEL, LLC	965H	LA MESA	CA
2021-03-16	858-786	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	NATIONALCY	CA
2021-03-11	858-313	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	DEL MAR	CA
2021-03-10	858-308	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	SNDG LVTA	CA
2021-02-17	858-305	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	SNDG MRMS	CA
2021-01-27	858-399	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	CORONADO	CA
2021-01-13	858-588	0–9 XXXall 10 · 5 holders which blocks →	FRACTEL, LLC	965H	RNCHOBRNDO	CA
2021-01-08	858-241	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	LA JOLLA	CA
2021-01-04	858-789	0–9 XXXall 10 · 2 holders which blocks →	FRACTEL, LLC	965H	SNDG SNDG	CA
2021-01-04	858-899	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	EL CAJON	CA
2020-11-11	858-727	0–9 XXXall 10 · 5 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	SNDG SNDG	CA
2020-11-09	858-667	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	SNDG LVTA	CA
2020-11-06	858-358	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - CA	649C	EL CAJON	CA
2020-09-17	858-758	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	EL CAJON	CA
2020-09-17	858-833	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	SNDG SNDG	CA
2020-09-17	858-955	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	FRACTEL, LLC	965H	PINEVALLEY	CA
2020-09-08	858-238	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	EL CAJON	CA
2020-07-10	858-599	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	NATIONALCY	CA
2020-07-10	858-867	0–9 XXXall 10 · 5 holders which blocks →	FRACTEL, LLC	965H	SNDG SNDG	CA
2020-06-11	858-301	0–9 XXXall 10 · 2 holders which blocks →	VONAGE AMERICA LLC	197D	EL CAJON	CA
2020-05-13	858-289	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SNDG LVTA	CA
2020-03-27	858-977	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	DEL MAR	CA
2020-02-04	858-298	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SNDG LVTA	CA
2019-12-23	858-235	0–9 XXXwhole prefix which blocks →	PAETEC ITEL, LLC	829J	LA JOLLA	CA
2019-07-23	858-294	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	CHULAVISTA	CA
2019-05-16	858-293	0–9 XXXall 10 · 5 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	SNDG MRMS	CA
2019-03-19	858-388	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	EL CAJON	CA
2019-03-19	858-585	0–9 XXXall 10 · 3 holders which blocks →	FRACTEL, LLC	965H	LA MESA	CA
2019-03-19	858-788	0–9 XXXall 10 · 5 holders which blocks →	FRACTEL, LLC	965H	LA JOLLA	CA
2019-03-19	858-988	0–9 XXXall 10 · 5 holders which blocks →	FRACTEL, LLC	965H	SNDG SNDG	CA
2019-02-28	858-290	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	DEL MAR	CA
2019-01-22	858-288	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	SNDG MRMS	CA
2018-12-19	858-868	0–9 XXXall 10 · 5 holders which blocks →	HD CARRIER LLC	321J	SNDG SNDG	CA
2018-11-26	858-286	0–9 XXXall 10 · 2 holders which blocks →	VONAGE AMERICA LLC	197D	CHULAVISTA	CA
2018-10-03	858-269	0–9 XXXall 10 · 5 holders which blocks →	PACIFIC BELL	9740	POWAY	CA
2018-06-07	858-258	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - CA	8826	SNDG MRMS	CA
2018-03-06	858-471	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	SNDG MRMS	CA
2018-02-23	858-648	0–9 XXXall 10 · 3 holders which blocks →	EXIANT COMMUNICATIONS LLC	114J	POWAY	CA
2017-11-22	858-214	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	LA JOLLA	CA
2017-11-22	858-307	0–9 XXXwhole prefix which blocks →	PACIFIC BELL	9740	SNDG MRMS	CA
2017-10-03	858-302	0–9 XXXall 10 · 7 holders which blocks →	COMCAST PHONE OF CALIFORNIA, LLC	394L	SNDG LVTA	CA
2017-05-22	858-209	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	DEL MAR	CA
2017-04-14	858-282	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SNDG MRMS	CA
2016-10-10	858-283	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - CA	649C	LA JOLLA	CA
2016-08-08	858-280	0–9 XXXall 10 · 6 holders which blocks →	AT&T ENTERPRISES, LLC	516C	DEL MAR	CA
2016-06-14	858-329	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	SNDG MRMS	CA
2016-02-26	858-276	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SNDG LVTA	CA
2016-01-29	858-757	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - CA	649C	SNDG MRMS	CA
2016-01-27	858-203	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC - CA	649C	LA JOLLA	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.