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
2023-03-09	346-627	0–9 XXXall 10 · 3 holders which blocks →	LEAP TELECOM, LLC	616J	HSTNSUBURB	TX
2023-02-23	346-618	0–9 XXXwhole prefix which blocks →	COMCAST IP PHONE, LLC	318J	HOUSTON	TX
2023-02-16	346-619	0–9 XXXall 10 · 3 holders which blocks →	NUSO, LLC	732J	HOUSTON	TX
2023-02-08	346-615	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - TX	903C	KATY	TX
2023-01-25	346-346	0–9 XXXall 10 · 3 holders which blocks →	USFON, INC. - TX	473F	FRIENDSWD	TX
2023-01-20	346-676	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - TX	903C	KEMAH	TX
2023-01-18	346-634	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	CYPRESS	TX
2023-01-12	346-628	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HOUSTON	TX
2023-01-12	346-638	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HOUSTON	TX
2023-01-12	346-648	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HOUSTON	TX
2023-01-12	346-649	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HOUSTON	TX
2023-01-05	346-625	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	SPRING	TX
2023-01-05	346-629	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	RICHMNRNBG	TX
2023-01-05	346-631	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	RICHMNRNBG	TX
2023-01-05	346-632	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	RICHMNRNBG	TX
2023-01-04	346-630	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	BAYTOWN	TX
2023-01-03	346-620	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	RICHMNRNBG	TX
2023-01-03	346-623	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	SATSUMA	TX
2022-12-29	346-662	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - TX	903C	HUMBLE	TX
2022-12-21	346-614	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	HSTNSUBURB	TX
2022-12-21	346-654	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - TX	903C	PINEHURST	TX
2022-12-20	346-613	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	HOUSTON	TX
2022-12-13	346-609	0–9 XXXall 10 · 3 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - TX	7138	BAMMEL	TX
2022-12-13	346-612	0–9 XXXall 10 · 5 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	CLEVELAND	TX
2022-12-01	346-608	0–9 XXXall 10 · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - TX	6114	KATY	TX
2022-11-22	346-605	0–9 XXXall 10 · 4 holders which blocks →	METROPCS, INC.	5562	HSTNSUBURB	TX
2022-11-22	346-607	0–9 XXXall 10 · 2 holders which blocks →	METROPCS, INC.	5562	HOUSTON	TX
2022-11-16	346-636	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - TX	903C	BAMMEL	TX
2022-11-16	346-656	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - TX	903C	LANGHAMCRK	TX
2022-11-16	346-663	0XXX1XXX2XXX3XXX4XXX8XXX which blocks →	ONVOY, LLC - TX	903C	HIGHLANDS	TX
2022-11-15	346-604	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	LANGHAMCRK	TX
2022-11-02	346-603	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	ALVIN	TX
2022-10-28	346-602	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	BAYTOWN	TX
2022-10-20	346-601	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	HOUSTON	TX
2022-10-14	346-596	0–9 XXXwhole prefix which blocks →	ONVOY SPECTRUM, LLC	624H	HUMBLE	TX
2022-10-14	346-597	0–9 XXXall 10 · 2 holders which blocks →	ONVOY SPECTRUM, LLC	624H	LANGHAMCRK	TX
2022-10-14	346-598	0–9 XXXall 10 · 2 holders which blocks →	ONVOY SPECTRUM, LLC	624H	TOMBALL	TX
2022-10-04	346-595	0–9 XXXall 10 · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	ARCOLA	TX
2022-10-03	346-594	0–9 XXXall 10 · 2 holders which blocks →	COMCAST IP PHONE, LLC	318J	BARKER	TX
2022-09-28	346-592	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	BAMMEL	TX
2022-09-28	346-593	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	BAMMEL	TX
2022-09-21	346-591	0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 2 holders which blocks →	COMCAST IP PHONE, LLC	318J	PORTER HTS	TX
2022-09-20	346-590	0–9 XXXall 10 · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	WESTFIELD	TX
2022-09-16	346-589	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	SPRING	TX
2022-09-07	346-587	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - TX	004F	CYPRESS	TX
2022-09-02	346-210	0–9 XXXall 10 · 3 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	RICHMNRNBG	TX
2022-09-02	346-281	0–9 XXXwhole prefix which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HOUSTON	TX
2022-09-02	346-430	0–9 XXXall 10 · 3 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HOUSTON	TX
2022-09-02	346-469	0–9 XXXall 10 · 3 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	HOUSTON	TX
2022-09-02	346-586	0–9 XXXall 10 · 3 holders which blocks →	AERIAL COMMUNICATIONS, INC.	6701	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.