Recent prefix assignments

0 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, all time — NPA 972

SOUTHWESTERN BELL 307

FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 183

NEW CINGULAR WIRELESS PCS, LLC - IL 58

MCIMETRO ACCESS TRANSMISSION SERVICES LLC 55

ONVOY, LLC - TX 24

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
2025-12-29	972-328	0–9 XXXall 10 · 4 holders which blocks →	E. RITTER COMMUNICATIONS, LLC	128L	DALLAS	TX
2023-12-15	972-944	0–9 XXXall 10 · 3 holders which blocks →	EON TELECOM, INC.	839J	DALLAS	TX
2023-08-08	972-710	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	GRANDPRARI	TX
2022-11-15	972-585	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLC - TX	903C	GRANDPRARI	TX
2022-06-21	972-565	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	FRISCO	TX
2022-05-04	972-640	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - TX	903C	GRANDPRARI	TX
2022-05-04	972-928	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - TX	903C	FRISCO	TX
2022-04-28	972-634	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - TX	903C	ALLEN	TX
2022-02-24	972-970	0–9 XXXwhole prefix which blocks →	ONVOY, LLC - TX	903C	GRANDPRARI	TX
2021-11-04	972-688	0–9 XXXall 10 · 3 holders which blocks →	HD CARRIER LLC	321J	PLANO	TX
2020-12-22	972-327	0–9 XXXall 10 · 4 holders which blocks →	METROPCS, INC.	5562	TERRELL	TX
2020-04-09	972-654	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	FRISCO	TX
2020-03-26	972-209	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	GRANDPRARI	TX
2019-11-19	972-777	0–9 XXXall 10 · 2 holders which blocks →	USFON, INC. - TX	473F	DALLAS	TX
2019-06-27	972-799	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	GRANDPRARI	TX
2018-09-24	972-945	0–9 XXXall 10 · 3 holders which blocks →	PEERLESS NETWORK OF TEXAS, LLC - TX	177F	JOSEPHINE	TX
2018-05-08	972-626	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	GRANDPRARI	TX
2018-04-04	972-520	0–9 XXXall 10 · 2 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - TX	7148	PLANO	TX
2018-03-26	972-942	0–9 XXXall 10 · 4 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - TX	7148	DALLAS	TX
2018-02-22	972-936	0–9 XXXwhole prefix which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - TX	7148	DALLAS	TX
2018-01-15	972-645	0–9 XXXall 10 · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - TX	6114	ITALY	TX
2017-11-30	972-482	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	GRANDPRARI	TX
2017-10-19	972-972	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC - TX	903C	DALLAS	TX
2017-05-22	972-433	0–9 XXXall 10 · 6 holders which blocks →	SOUTHWESTERN BELL	9533	PROSPER	TX
2017-05-18	972-324	0–9 XXXall 10 · 2 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	FRISCO	TX
2017-03-27	972-990	0–9 XXXwhole prefix which blocks →	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2017-03-02	972-806	0–9 XXXall 10 · 2 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - TX	7148	PLANO	TX
2017-01-24	972-940	0–9 XXXall 10 · 3 holders which blocks →	SOUTHWESTERN BELL	9533	DALLAS	TX
2016-09-30	972-903	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WAXAHACHIE	TX
2016-09-26	972-430	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - TX	6114	BLUE RIDGE	TX
2016-07-21	972-817	0–9 XXXwhole prefix which blocks →	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
2016-07-11	972-469	0–9 XXXall 10 · 4 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	FRISCO	TX
2014-12-03	972-737	0–9 XXXall 10 · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	ALLEN	TX
2012-12-18	972-597	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - TX	6114	ITALY	TX
2012-12-13	972-598	0–9 XXXall 10 · 5 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	DALLAS	TX
2012-10-18	972-885	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	551G	DALLAS	TX
2012-10-02	972-589	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	GRANDPRARI	TX
2012-10-02	972-802	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	GRANDPRARI	TX
2011-07-28	972-810	0–9 XXXall 10 · 7 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	CARROLLTON	TX
2011-03-24	972-905	0–9 XXXall 10 · 6 holders which blocks →	FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS	4344	PLANO	TX
2010-08-24	972-787	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	PROSPER	TX
2007-07-02	972-600	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - TX	903C	IRVING	TX
2006-05-22	972-400	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	GRANDPRARI	TX
2006-03-09	972-639	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	GRANDPRARI	TX
2005-10-21	972-971	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	GRANDPRARI	TX
2005-09-21	972-325	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - TX	6114	SEAGOVILLE	TX
2005-08-31	972-974	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	GRANDPRARI	TX
2005-02-15	972-689	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	GRANDPRARI	TX
2005-02-15	972-835	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	GRANDPRARI	TX
2005-02-15	972-922	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	GRANDPRARI	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.