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
—	972-938	not yet reported which blocks →	SOUTHWESTERN BELL	9533	WAXAHACHIE	TX
—	972-939	not yet reported which blocks →	FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS	4344	CARROLLTON	TX
—	972-941	1XXX3XXX4XXX · 2 holders which blocks →	FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS	4344	PLANO	TX
—	972-943	not yet reported which blocks →	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	PLANO	TX
—	972-946	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks →	SOUTHWESTERN BELL	9533	GRANDPRARI	TX
—	972-947	0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks →	FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS	4344	DLFTWTARPT	TX
—	972-948	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	IRVING	TX
—	972-949	not yet reported which blocks →	SOUTHWESTERN BELL	9533	GRANDPRARI	TX
—	972-950	not yet reported which blocks →				TX
—	972-952	not yet reported which blocks →	SOUTHWESTERN BELL	9533	DALLAS	TX
—	972-953	5XXX6XXX7XXX8XXX9XXX which blocks →	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
—	972-954	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - TX	903C	ALLEN	TX
—	972-956	not yet reported which blocks →	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	LEWISVILLE	TX
—	972-957	1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	IRVING	TX
—	972-958	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	MCKINNEY	TX
—	972-959	not yet reported which blocks →				TX
—	972-960	not yet reported which blocks →	SOUTHWESTERN BELL	9533	DALLAS	TX
—	972-961	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	ROCKWALL	TX
—	972-962	1XXX9XXX · 2 holders which blocks →	BRIGHTSPEED OF EASTERN TEXAS, INC.	2084	KAUFMAN	TX
—	972-963	0XXX1XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	FRISCO	TX
—	972-964	not yet reported which blocks →	FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS	4344	PLANO	TX
—	972-965	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	GRANDPRARI	TX
—	972-966	5XXX7XXX9XXX · 3 holders which blocks →	FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS	4344	LEWISVILLE	TX
—	972-967	not yet reported which blocks →	TELETOUCH COMMUNICATIONS, INC.	6591	GRANDPRARI	TX
—	972-968	7XXX8XXX9XXX which blocks →	SOUTHWESTERN BELL	9533	DALLAS	TX
—	972-969	not yet reported which blocks →	SOUTHWESTERN BELL	9533	DALLAS	TX
—	972-975	0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	SOUTHWESTERN BELL	9533	GRANDPRARI	TX
—	972-976	not yet reported which blocks →				TX
—	972-977	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	GRANDPRARI	TX
—	972-978	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	GRANDPRARI	TX
—	972-979	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	GRANDPRARI	TX
—	972-980	not yet reported which blocks →	SOUTHWESTERN BELL	9533	DALLAS	TX
—	972-981	not yet reported which blocks →	FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS	4344	PLANO	TX
—	972-982	0XXX2XXX7XXX8XXX · 3 holders which blocks →	SOUTHWESTERN BELL	9533	DALLAS	TX
—	972-983	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks →	SOUTHWESTERN BELL TELEPHONE COMPANY - TX	7726	IRVING	TX
—	972-984	0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	MCKINNEY	TX
—	972-985	not yet reported which blocks →	FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS	4344	PLANO	TX
—	972-986	not yet reported which blocks →	FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS	4344	IRVING	TX
—	972-987	0XXX2XXX3XXX4XXX7XXX9XXX · 3 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - TX	7148	FRISCO	TX
—	972-988	9XXX which blocks →	SOUTHWESTERN BELL	9533	GRANDPRARI	TX
—	972-989	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	GRANDPRARI	TX
—	972-991	not yet reported which blocks →	SOUTHWESTERN BELL	9533	DALLAS	TX
—	972-992	4XXX8XXX9XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - TX	6114	GRANDPRARI	TX
—	972-993	not yet reported which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	DALLAS	TX
—	972-994	6XXX which blocks →	SOUTHWESTERN BELL	9533	DALLAS	TX
—	972-995	not yet reported which blocks →	SOUTHWESTERN BELL	9533	DALLAS	TX
—	972-996	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks →	SOUTHWESTERN BELL	9533	DALLAS	TX
—	972-997	1XXX5XXX6XXX which blocks →	SOUTHWESTERN BELL	9533	DALLAS	TX
—	972-998	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	GRANDPRARI	TX
—	972-999	3XXX5XXX6XXX7XXX9XXX · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - TX	6114	IRVING	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.