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
2017-09-20	346-273	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	TOMBALL	TX
2017-09-07	346-268	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	SPRING	TX
2017-09-07	346-269	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	HSTNSUBURB	TX
2017-09-07	346-271	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	FRIENDSWD	TX
2017-08-16	346-299	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - TX	903C	HOUSTON	TX
2017-07-19	346-266	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	HOUSTON	TX
2017-07-18	346-265	0–9 XXXall 10 · 2 holders which blocks →	SOUTHWESTERN BELL	9533	HOUSTON	TX
2017-07-17	346-264	0–9 XXXall 10 · 3 holders which blocks →	METROPCS, INC.	5562	BARKER	TX
2017-06-15	346-263	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	BAYTOWN	TX
2017-05-25	346-261	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	PORTER	TX
2017-05-15	346-257	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - TX	6114	KATY	TX
2017-05-03	346-250	0–9 XXXall 10 · 2 holders which blocks →	VONAGE AMERICA LLC	197D	HOUSTON	TX
2017-04-11	346-286	0–9 XXXwhole prefix which blocks →	SOUTHWESTERN BELL	9533	HOUSTON	TX
2017-03-28	346-255	0–9 XXXall 10 · 4 holders which blocks →	METROPCS, INC.	5562	CHANNELVW	TX
2017-03-28	346-420	0–9 XXXall 10 · 4 holders which blocks →	METROPCS, INC.	5562	SUGAR LAND	TX
2017-03-27	346-246	0–9 XXXall 10 · 6 holders which blocks →	SOUTHWESTERN BELL	9533	TOMBALL	TX
2017-03-27	346-249	0–9 XXXall 10 · 3 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	BAMMEL	TX
2017-03-16	346-259	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - TX	7138	BAYTOWN	TX
2017-03-16	346-493	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	BAMMEL	TX
2017-03-16	346-606	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	BAMMEL	TX
2017-03-10	346-254	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	CYPRESS	TX
2017-01-17	346-243	0–9 XXXall 10 · 2 holders which blocks →	METROPCS, INC.	5562	BARKER	TX
2017-01-17	346-244	0–9 XXXall 10 · 5 holders which blocks →	METROPCS, INC.	5562	SATSUMA	TX
2017-01-17	346-245	0–9 XXXall 10 · 4 holders which blocks →	METROPCS, INC.	5562	STAFFORD	TX
2017-01-17	346-288	0–9 XXXall 10 · 3 holders which blocks →	METROPCS, INC.	5562	BEACH CITY	TX
2017-01-05	346-242	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	LANGHAMCRK	TX
2016-12-20	346-413	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	SPRING	TX
2016-12-12	346-360	0–9 XXXall 10 · 3 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	BAMMEL	TX
2016-12-02	346-406	0–9 XXXall 10 · 4 holders which blocks →	TELNYX LLC	073H	HOUSTON	TX
2016-11-18	346-330	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	HOUSTON	TX
2016-11-07	346-763	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	BAMMEL	TX
2016-11-03	346-719	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HOUSTON	TX
2016-11-02	346-414	0–9 XXXall 10 · 5 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	CLEVELAND	TX
2016-11-02	346-867	0–9 XXXall 10 · 6 holders which blocks →	COMMIO, LLC	939H	HOUSTON	TX
2016-10-19	346-874	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 OF TELECOM OF TEXAS, LLC - TX	7074	SUGAR LAND	TX
2016-10-19	346-998	0–9 XXXwhole prefix which blocks →	PEERLESS NETWORK OF TEXAS, LLC - TX	177F	HOUSTON	TX
2016-10-11	346-779	0–9 XXXwhole prefix which blocks →	METROPCS, INC.	5562	SUGAR LAND	TX
2016-10-06	346-774	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	HSTNSUBURB	TX
2016-09-09	346-561	0–9 XXXall 10 · 3 holders which blocks →	PEERLESS NETWORK OF TEXAS, LLC - TX	177F	HOUSTON	TX
2016-09-06	346-570	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 OF TELECOM OF TEXAS, LLC - TX	7074	HSTNSUBURB	TX
2016-08-31	346-816	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	ARCOLA	TX
2016-08-30	346-336	0–9 XXXall 10 · 6 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	TOMBALL	TX
2016-07-27	346-773	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	HSTNSUBURB	TX
2016-07-18	346-762	0–9 XXXall 10 · 5 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - TX	7138	RICHMNRNBG	TX
2016-07-14	346-760	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	METROPCS, INC.	5562	BARKER	TX
2016-07-14	346-843	0–9 XXXall 10 · 7 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	RICHMNRNBG	TX
2016-07-06	346-241	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - TX	903C	HOUSTON	TX
2016-06-27	346-757	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	STAFFORD	TX
2016-06-24	346-917	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	CHANNELVW	TX
2016-06-10	346-412	0–9 XXXall 10 · 3 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	CYPRESS	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.