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
2015-03-25	346-228	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	HOUSTON	TX
2015-03-25	346-234	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	HOUSTON	TX
2015-03-25	346-600	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - TX	903C	HUMBLE	TX
2015-03-17	346-200	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - TX	903C	HOUSTON	TX
2015-03-04	346-703	0–9 XXXall 10 · 6 holders which blocks →	COMCAST IP PHONE, LLC	318J	PINEHURST	TX
2015-03-02	346-218	0–9 XXXall 10 · 3 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	CYPRESS	TX
2015-02-03	346-221	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	HOUSTON	TX
2015-01-28	346-219	0–9 XXXall 10 · 3 holders which blocks →	COMCAST IP PHONE, LLC	318J	HSTNSUBURB	TX
2015-01-26	346-216	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX	7239	BAYTOWN	TX
2015-01-21	346-301	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	SPLENDORA	TX
2014-12-24	346-206	0–9 XXXall 10 · 7 holders which blocks →	ONVOY, LLC - TX	903C	SATSUMA	TX
2014-12-23	346-215	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC - TX	903C	ALVIN	TX
2014-12-16	346-203	0–9 XXXall 10 · 5 holders which blocks →	PAETEC ITEL, LLC	829J	HSTNSUBURB	TX
2014-12-16	346-207	0–9 XXXall 10 · 4 holders which blocks →	SOUTHWESTERN BELL	9533	HSTNSUBURB	TX
2014-12-16	346-208	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	DICKINSON	TX
2014-12-01	346-202	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - TX	903C	BAMMEL	TX
2014-11-26	346-201	0–9 XXXall 10 · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX	7239	HOUSTON	TX
2014-05-08	346-932	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - TX	903C	HOUSTON	TX
2014-02-27	346-720	0–9 XXXwhole prefix which blocks →	SOUTHWESTERN BELL	9533	HOUSTON	TX
2014-02-27	346-721	0–9 XXXwhole prefix which blocks →	SOUTHWESTERN BELL	9533	HOUSTON	TX
2014-02-27	346-722	0–9 XXXwhole prefix which blocks →	SOUTHWESTERN BELL	9533	HOUSTON	TX
2014-02-27	346-723	0–9 XXXwhole prefix which blocks →	SOUTHWESTERN BELL	9533	HOUSTON	TX
2014-02-27	346-725	0–9 XXXwhole prefix which blocks →	SOUTHWESTERN BELL	9533	HOUSTON	TX
2014-02-27	346-726	0–9 XXXwhole prefix which blocks →	SOUTHWESTERN BELL	9533	HOUSTON	TX
2014-02-27	346-727	0–9 XXXwhole prefix which blocks →	SOUTHWESTERN BELL	9533	HOUSTON	TX
2014-02-27	346-728	0–9 XXXwhole prefix which blocks →	SOUTHWESTERN BELL	9533	HOUSTON	TX
2014-02-27	346-729	0–9 XXXwhole prefix which blocks →	SOUTHWESTERN BELL	9533	HOUSTON	TX
2014-02-27	346-834	0–9 XXXwhole prefix which blocks →	SOUTHWESTERN BELL	9533	HOUSTON	TX
2014-02-03	346-247	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - TX	903C	HOUSTON	TX
2014-01-16	346-444	0–9 XXXall 10 · 4 holders which blocks →	FOREMOST TELECOMMUNICATIONS CORPORATION - TX	319D	HOUSTON	TX
2014-01-16	346-999	0–9 XXXall 10 · 5 holders which blocks →	FOREMOST TELECOMMUNICATIONS CORPORATION - TX	319D	HUFFMAN	TX
2014-01-15	346-222	0–9 XXXall 10 · 6 holders which blocks →	FOREMOST TELECOMMUNICATIONS CORPORATION - TX	319D	LA PORTE	TX
2014-01-15	346-333	0–9 XXXall 10 · 4 holders which blocks →	FOREMOST TELECOMMUNICATIONS CORPORATION - TX	319D	LANGHAMCRK	TX
2014-01-15	346-777	0–9 XXXall 10 · 2 holders which blocks →	FOREMOST TELECOMMUNICATIONS CORPORATION - TX	319D	BAMMEL	TX
2014-01-15	346-888	0–9 XXXall 10 · 5 holders which blocks →	FOREMOST TELECOMMUNICATIONS CORPORATION - TX	319D	HSTNSUBURB	TX
—	346-211	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	TX
—	346-212	0–9 XXXall 10 · 3 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HOUSTON	TX
—	346-237	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	HOUSTON	TX
—	346-267	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	HOUSTON	TX
—	346-311	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	TX
—	346-344	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - TX	903C	CROSBY	TX
—	346-347	0–9 XXXall 10 · 5 holders which blocks →	TELNYX LLC	073H	ALVIN	TX
—	346-354	0–9 XXXall 10 · 6 holders which blocks →	PEERLESS NETWORK OF TEXAS, LLC - TX	177F	HOUSTON	TX
—	346-383	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HOUSTON	TX
—	346-403	0–9 XXXall 10 · 3 holders which blocks →	PEERLESS NETWORK OF TEXAS, LLC - TX	177F	HOUSTON	TX
—	346-405	0–9 XXXall 10 · 3 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - TX	7138	HOUSTON	TX
—	346-411	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	TX
—	346-436	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	LANGHAMCRK	TX
—	346-509	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - TX	903C	HOUSTON	TX
—	346-511	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	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.