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
2021-07-29	559-619	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VISALIA	CA
2021-07-13	559-944	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	FRESNO	CA
2021-07-07	559-220	0–9 XXXall 10 · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	LEMOORE	CA
2021-06-23	559-609	0XXX which blocks →	TELNYX LLC	073H	STRATFORD	CA
2021-04-19	559-616	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA	6006	TULARE	CA
2021-04-19	559-833	0–9 XXXall 10 · 3 holders which blocks →	FRACTEL, LLC	965H	SELMA	CA
2021-04-16	559-966	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 8 holders which blocks →	FRACTEL, LLC	965H	SPRINGVL	CA
2021-04-02	559-603	0–9 XXXall 10 · 4 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7145	FRESNO	CA
2021-04-01	559-910	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	ONVOY, LLC - CA	649C	GRANTGROVE	CA
2021-03-26	559-613	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	MADERA	CA
2021-03-05	559-758	0–9 XXXall 10 · 7 holders which blocks →	FRACTEL, LLC	965H	PARLIER	CA
2021-03-05	559-946	0–9 XXXall 10 · 2 holders which blocks →	FRACTEL, LLC	965H	VISALIA	CA
2020-12-09	559-604	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VISALIA	CA
2020-11-25	559-581	0–9 XXXall 10 · 3 holders which blocks →	IP HORIZON LLC	515J	FRESNO	CA
2020-11-18	559-844	0XXX1XXX2XXX4XXX5XXX6XXX7XXX · 4 holders which blocks →	FRACTEL, LLC	965H	MIRANTPHST	CA
2020-10-22	559-557	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VISALIA	CA
2020-10-14	559-518	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VISALIA	CA
2020-09-24	559-552	0–9 XXXall 10 · 4 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	FRESNO	CA
2020-07-24	559-599	0–9 XXXall 10 · 3 holders which blocks →	FRACTEL, LLC	965H	CLOVIS	CA
2020-07-10	559-699	0–9 XXXall 10 · 3 holders which blocks →	FRACTEL, LLC	965H	VISALIA	CA
2020-07-10	559-955	0–9 XXXall 10 · 4 holders which blocks →	FRACTEL, LLC	965H	TIVYVALLEY	CA
2020-05-28	559-516	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VISALIA	CA
2020-04-07	559-507	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	MADERA	CA
2020-03-25	559-509	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	TULARE	CA
2020-02-13	559-209	0–9 XXXall 10 · 4 holders which blocks →	CSC WIRELESS, LLC	425J	FRESNO	CA
2019-11-19	559-602	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	VISALIA	CA
2019-09-18	559-710	0–9 XXXall 10 · 5 holders which blocks →	ONVOY SPECTRUM, LLC	624H	FRESNO	CA
2019-08-26	559-569	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	FRESNO	CA
2019-08-21	559-414	0–9 XXXall 10 · 4 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - CA	7145	CORCORAN	CA
2019-06-24	559-379	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - CA	649C	LINDSAY	CA
2019-04-08	559-605	0–9 XXXall 10 · 5 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	TULARE	CA
2018-04-26	559-319	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	FRESNO	CA
2018-02-23	559-729	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	EXIANT COMMUNICATIONS LLC	114J	AVENAL	CA
2017-12-14	559-890	0–9 XXXall 10 · 7 holders which blocks →	VONAGE AMERICA LLC	197D	FRESNO	CA
2017-08-22	559-550	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - CA	649C	FRESNO	CA
2017-03-24	559-878	0–9 XXXall 10 · 5 holders which blocks →	COMMIO, LLC	939H	FRESNO	CA
2017-03-23	559-701	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	CLOVIS	CA
2017-03-17	559-705	0–9 XXXall 10 · 6 holders which blocks →	TELNYX LLC	073H	FRESNO	CA
2017-02-14	559-293	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	FRESNO	CA
2016-12-15	559-409	0–9 XXXall 10 · 5 holders which blocks →	TELNYX LLC	073H	VISALIA	CA
2016-12-01	559-290	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	FRESNO	CA
2016-08-31	559-207	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	CLOVIS	CA
2016-08-30	559-371	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	FRESNO	CA
2016-08-25	559-216	0–9 XXXall 10 · 3 holders which blocks →	PEERLESS NETWORK OF CALIFORNIA, LLC - CA	373F	FRESNO	CA
2016-07-01	559-214	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	FRESNO	CA
2016-06-08	559-615	0–9 XXXall 10 · 5 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	PORTERVL	CA
2016-04-01	559-601	0–9 XXXall 10 · 7 holders which blocks →	T-MOBILE USA, INC.	6529	CARUTHERS	CA
2015-11-20	559-206	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - CA	649C	FRESNO	CA
2015-11-13	559-551	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	REEDLEY	CA
2015-09-11	559-491	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	HANFORD	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.