Recent prefix assignments

6 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 346

ONVOY, LLC - TX 4

PAETEC ITEL, LLC 1

8X8, INC. 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
2018-08-30	346-362	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - TX	903C	SHELDON	TX
2018-08-21	346-357	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	HSTNSUBURB	TX
2018-08-15	346-446	0–9 XXXall 10 · 3 holders which blocks →	WIDE VOICE, LLC - TX	706G	HOUSTON	TX
2018-08-14	346-355	0–9 XXXall 10 · 3 holders which blocks →	VOIP INNOVATIONS, LLC	597F	HOUSTON	TX
2018-07-24	346-353	0–9 XXXall 10 · 4 holders which blocks →	AIRESPRING, INC.	996H	HOUSTON	TX
2018-07-23	346-356	0–9 XXXwhole prefix which blocks →	LEVEL 3 COMMUNICATIONS, LLC - TX	6114	HOUSTON	TX
2018-07-19	346-350	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	SUGAR LAND	TX
2018-07-17	346-349	0–9 XXXall 10 · 2 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	CHANNELVW	TX
2018-07-02	346-348	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	HOUSTON	TX
2018-06-27	346-345	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	HUMBLE	TX
2018-05-29	346-341	0–9 XXXall 10 · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	STAFFORD	TX
2018-05-29	346-342	0–9 XXXall 10 · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	HSTNSUBURB	TX
2018-05-17	346-343	0–9 XXXwhole prefix which blocks →	WINDSTREAM SUGAR LAND, LLC	2147	SUGAR LAND	TX
2018-05-15	346-339	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	HOUSTON	TX
2018-05-07	346-338	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	VLY LODGE	TX
2018-04-19	346-337	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	CYPRESS	TX
2018-04-17	346-334	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	SPRING	TX
2018-04-17	346-335	0–9 XXXall 10 · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	HOUSTON	TX
2018-03-26	346-329	0–9 XXXall 10 · 2 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	BAMMEL	TX
2018-03-23	346-328	0–9 XXXall 10 · 4 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - TX	7138	SPRING	TX
2018-03-22	346-327	0–9 XXXwhole prefix which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	HOUSTON	TX
2018-03-21	346-325	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	SATSUMA	TX
2018-03-13	346-324	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	HOUSTON	TX
2018-03-12	346-318	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	ALVIN	TX
2018-03-09	346-297	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	HSTNSUBURB	TX
2018-03-09	346-298	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	SPRING	TX
2018-02-23	346-296	0–9 XXXall 10 · 5 holders which blocks →	EXIANT COMMUNICATIONS LLC	114J	PINEHURST	TX
2018-02-22	346-332	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - TX	903C	CYPRESS	TX
2018-02-07	346-295	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - TX	903C	ARCOLA	TX
2018-02-06	346-326	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - TX	903C	HOUSTON	TX
2018-02-05	346-306	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - TX	903C	LANGHAMCRK	TX
2018-01-17	346-294	0–9 XXXall 10 · 3 holders which blocks →	IP GLOBAL NETWORKS - TX	763H	HOUSTON	TX
2018-01-16	346-293	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	HOUSTON	TX
2017-12-26	346-291	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	HSTNSUBURB	TX
2017-12-26	346-292	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 OF TELECOM OF TEXAS, LLC - TX	7074	BAYTOWN	TX
2017-12-20	346-290	0–9 XXXall 10 · 2 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	BAMMEL	TX
2017-12-20	346-322	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - TX	903C	BARKER	TX
2017-12-11	346-289	0–9 XXXall 10 · 3 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	DICKINSON	TX
2017-12-08	346-287	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	LANGHAMCRK	TX
2017-11-22	346-285	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	BAMMEL	TX
2017-11-15	346-283	0–9 XXXall 10 · 2 holders which blocks →	METROPCS, INC.	5562	STAFFORD	TX
2017-11-15	346-284	0–9 XXXall 10 · 2 holders which blocks →	METROPCS, INC.	5562	BEACH CITY	TX
2017-11-03	346-282	0–9 XXXall 10 · 4 holders which blocks →	METROPCS, INC.	5562	CHANNELVW	TX
2017-10-25	346-280	0–9 XXXall 10 · 4 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	CYPRESS	TX
2017-10-18	346-279	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX	7239	SUGAR LAND	TX
2017-10-04	346-278	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MANVEL	TX
2017-10-03	346-275	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - TX	903C	HSTNSUBURB	TX
2017-10-03	346-277	0–9 XXXall 10 · 4 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - TX	7138	SATSUMA	TX
2017-09-22	346-274	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	HOUSTON	TX
2017-09-20	346-272	0–9 XXXall 10 · 5 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - TX	7138	HOUSTON	TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.