Recent prefix assignments

4 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 559

INTRADO COMMUNICATIONS, LLC 2

HD CARRIER LLC 1

EXIANT COMMUNICATIONS LLC 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
2023-10-04	559-879	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - CA	649C	VISALIA	CA
2023-08-23	559-870	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	TULARE	CA
2023-08-23	559-872	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	CLOVIS	CA
2023-08-17	559-508	0–9 XXXall 10 · 3 holders which blocks →	ONVOY SPECTRUM, LLC	624H	FRESNO	CA
2023-08-10	559-219	0XXX1XXX2XXX3XXX4XXX8XXX · 2 holders which blocks →	COMMIO, LLC	939H	TIPTON	CA
2023-08-08	559-505	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	MADERA	CA
2023-08-04	559-502	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VISALIA	CA
2023-07-14	559-215	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SELMA	CA
2023-06-22	559-863	0XXX3XXX6XXX8XXX · 4 holders which blocks →	TWILIO INTERNATIONAL, INC.	506J	DUNLAP	CA
2023-06-15	559-857	0XXX which blocks →	BOOST SUBSCRIBERCO L.L.C.	490J	FRIANT	CA
2023-06-14	559-849	0XXX which blocks →	BOOST SUBSCRIBERCO L.L.C.	490J	O NEALS	CA
2023-06-13	559-848	7XXX8XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	WOODLAKE	CA
2023-05-03	559-830	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VISALIA	CA
2023-05-03	559-839	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VISALIA	CA
2023-03-10	559-820	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VISALIA	CA
2023-01-11	559-815	0–9 XXXall 10 · 3 holders which blocks →	NUSO, LLC	732J	FRESNO	CA
2022-11-17	559-845	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - CA	649C	DINUBA	CA
2022-11-17	559-954	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - CA	649C	EXETER	CA
2022-10-25	559-995	1XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	COMMIO, LLC	939H	DEL REY	CA
2022-10-05	559-810	1XXX7XXX9XXX · 3 holders which blocks →	COMCAST PHONE OF CALIFORNIA, LLC	394L	CARUTHERS	CA
2022-09-02	559-807	0–9 XXXall 10 · 3 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7145	FRESNO	CA
2022-08-25	559-703	0–9 XXXwhole prefix which blocks →	ONVOY SPECTRUM, LLC	624H	FRESNO	CA
2022-08-22	559-814	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	FOWLER	CA
2022-08-10	559-767	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	CLOVIS	CA
2022-06-30	559-806	0–9 XXXall 10 · 5 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	VISALIA	CA
2022-06-30	559-828	0XXX2XXX6XXX7XXX · 3 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	SELMA	CA
2022-05-27	559-764	0–9 XXXall 10 · 3 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	MADERA	CA
2022-05-26	559-218	0–9 XXXall 10 · 3 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	FRESNO	CA
2022-03-02	559-993	0–9 XXXall 10 · 2 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	VISALIA	CA
2022-02-24	559-939	0–9 XXXall 10 · 3 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	FRESNO	CA
2022-02-21	559-669	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	FRESNO	CA
2022-02-18	559-929	0–9 XXXall 10 · 5 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	HANFORD	CA
2022-02-18	559-996	0–9 XXXall 10 · 5 holders which blocks →	TON80 COMMUNICATIONS, LLC	516J	CORCORAN	CA
2022-01-18	559-812	0–9 XXXall 10 · 5 holders which blocks →	BOOST SUBSCRIBERCO L.L.C.	490J	CHOWCHILLA	CA
2021-12-30	559-809	0–9 XXXall 10 · 3 holders which blocks →	BOOST SUBSCRIBERCO L.L.C.	490J	VISALIA	CA
2021-12-21	559-774	0–9 XXXall 10 · 5 holders which blocks →	BOOST SUBSCRIBERCO L.L.C.	490J	FRESNO	CA
2021-12-14	559-768	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	REEDLEY	CA
2021-12-13	559-649	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	CLOVIS	CA
2021-11-17	559-902	0–9 XXXall 10 · 3 holders which blocks →	ONVOY SPECTRUM, LLC	624H	SANGER	CA
2021-11-15	559-617	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	KINGSBURG	CA
2021-11-15	559-680	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	FRESNO	CA
2021-11-15	559-714	0XXX7XXX9XXX · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	ORANGECOVE	CA
2021-11-01	559-607	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	DINUBA	CA
2021-10-28	559-378	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	TULARE	CA
2021-10-28	559-576	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	PORTERVL	CA
2021-10-22	559-628	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - CA	981E	CLOVIS	CA
2021-10-05	559-716	0–9 XXXall 10 · 5 holders which blocks →	METROPCS, INC.	5562	MADERA	CA
2021-09-24	559-990	0–9 XXXall 10 · 5 holders which blocks →	SKYE TELECOM LLC DBA SKYETEL	622J	SANGER	CA
2021-08-31	559-610	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VISALIA	CA
2021-08-31	559-620	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	SELMA	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.