Recent prefix assignments

6 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 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
2016-05-27	346-235	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - TX	903C	BAMMEL	TX
2016-05-25	346-351	0–9 XXXall 10 · 5 holders which blocks →	CHARTER IP ENABLED SERVICES, LLC	792K	SPRING	TX
2016-05-23	346-954	0–9 XXXall 10 · 6 holders which blocks →	AT&T ENTERPRISES, LLC	516C	DEER PARK	TX
2016-05-20	346-410	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	HSTNSUBURB	TX
2016-05-11	346-258	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - TX	903C	SHELDON	TX
2016-05-04	346-236	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	TOMBALL	TX
2016-04-20	346-262	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	HOUSTON	TX
2016-04-20	346-352	0–9 XXXall 10 · 4 holders which blocks →	AT&T ENTERPRISES, LLC	516C	HOUSTON	TX
2016-04-19	346-238	0–9 XXXwhole prefix which blocks →	LEVEL 3 OF TELECOM OF TEXAS, LLC - TX	7074	HOUSTON	TX
2016-04-14	346-714	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	BAMMEL	TX
2016-04-14	346-715	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	BAMMEL	TX
2016-04-14	346-718	0–9 XXXall 10 · 6 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HOUSTON	TX
2016-04-06	346-253	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MANVEL	TX
2016-03-30	346-323	0–9 XXXall 10 · 6 holders which blocks →	BRIGHTSPEED OF TEXAS, INC.	2114	HUMBLE	TX
2016-03-23	346-787	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	ONVOY, LLC - TX	903C	LA PORTE	TX
2016-03-11	346-907	0–9 XXXall 10 · 4 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HSTNSUBURB	TX
2016-03-03	346-233	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - TX	903C	BAYTOWN	TX
2016-03-03	346-368	0–9 XXXall 10 · 5 holders which blocks →	ETS TELEPHONE COMPANY, INC.	2091	SUGAR LAND	TX
2016-02-24	346-387	0–9 XXXall 10 · 4 holders which blocks →	ETS TELEPHONE COMPANY, INC.	2091	KATY	TX
2016-02-19	346-404	0–9 XXXall 10 · 2 holders which blocks →	IP GLOBAL NETWORKS - TX	763H	HOUSTON	TX
2016-02-16	346-230	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - TX	903C	APOLLO	TX
2016-02-04	346-223	0–9 XXXall 10 · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	HOUSTON	TX
2016-02-04	346-226	0–9 XXXall 10 · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	HOUSTON	TX
2016-02-04	346-227	0–9 XXXall 10 · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	HOUSTON	TX
2016-01-29	346-232	0–9 XXXall 10 · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX	7239	HOUSTON	TX
2016-01-18	346-717	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	BAMMEL	TX
2016-01-12	346-310	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	HOUSTON	TX
2016-01-05	346-252	0–9 XXXall 10 · 6 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - TX	7138	HSTNSUBURB	TX
2015-12-29	346-321	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	CHANNELVW	TX
2015-12-28	346-260	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	SATSUMA	TX
2015-12-23	346-220	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - TX	903C	SPRING	TX
2015-12-22	346-616	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - TX	6114	HUMBLE	TX
2015-12-22	346-617	0–9 XXXall 10 · 5 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	DICKINSON	TX
2015-12-17	346-319	0–9 XXXall 10 · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	HOUSTON	TX
2015-12-16	346-316	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	BAMMEL	TX
2015-12-15	346-770	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - TX	903C	BAMMEL	TX
2015-12-15	346-831	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	SPRING	TX
2015-12-10	346-814	0–9 XXXall 10 · 3 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	SPRING	TX
2015-12-10	346-818	0–9 XXXall 10 · 4 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	CYPRESS	TX
2015-12-08	346-214	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - TX	903C	HOUSTON	TX
2015-12-08	346-340	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - TX	903C	HSTNSUBURB	TX
2015-11-25	346-256	0–9 XXXall 10 · 2 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HOUSTON	TX
2015-11-25	346-320	0–9 XXXall 10 · 6 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HOUSTON	TX
2015-11-24	346-317	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HOUSTON	TX
2015-11-24	346-775	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HOUSTON	TX
2015-11-13	346-239	0–9 XXXall 10 · 5 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	RICHMNRNBG	TX
2015-11-12	346-315	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	DEER PARK	TX
2015-11-05	346-276	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	BAMMEL	TX
2015-10-23	346-402	0–9 XXXall 10 · 5 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	CLEVELAND	TX
2015-09-28	346-308	0–9 XXXall 10 · 5 holders which blocks →	PEERLESS NETWORK OF TEXAS, LLC - TX	177F	HOUSTON	TX

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.