Recent prefix assignments

1 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 361

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
—	361-516	5XXX7XXX which blocks →	SOUTHWESTERN BELL	9533	KINGSVILLE	TX
—	361-520	1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	CALALLEN	TX
—	361-522	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	KINGSVILLE	TX
—	361-526	0XXX3XXX6XXX7XXX8XXX · 3 holders which blocks →	SOUTHWESTERN BELL	9533	REFUGIO	TX
—	361-527	0XXX6XXX7XXX8XXX · 4 holders which blocks →	SOUTHWESTERN BELL	9533	HEBBRONVL	TX
—	361-528	6XXX7XXX8XXX9XXX · 3 holders which blocks →	FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS	4344	TAFT	TX
—	361-529	0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 5 holders which blocks →	SOUTHWESTERN BELL	9533	BAYSIDE	TX
—	361-530	4XXX which blocks →	TERRA NOVA TELECOM INC.	145J	ORANGE GRV	TX
—	361-532	0XXX1XXX2XXX3XXX4XXX7XXX · 5 holders which blocks →	STPCS JOINT VENTURE, LLC	4290	EDNA	TX
—	361-537	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	C CHRISTI	TX
—	361-539	not yet reported which blocks →	VALLEY TEL. COOP., INC.	2159	CONCEPCION	TX
—	361-541	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - TX	6114	VICTORIA	TX
—	361-543	0XXX1XXX2XXX3XXX7XXX9XXX · 4 holders which blocks →	SOUTHWESTERN BELL	9533	WOODSBORO	TX
—	361-547	not yet reported which blocks →	SOUTHWESTERN BELL	9533	MATHIS	TX
—	361-548	none assigned yet which blocks →	METROPCS, INC.	5562	C CHRISTI	TX
—	361-549	none assigned yet which blocks →	METROPCS, INC.	5562	C CHRISTI	TX
—	361-550	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	VICTORIA	TX
—	361-551	0XXX1XXX6XXX8XXX · 3 holders which blocks →	FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS	4344	PORTLAVACA	TX
—	361-552	not yet reported which blocks →	FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS	4344	PORTLAVACA	TX
—	361-553	0XXX which blocks →	FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS	4344	PORTLAVACA	TX
—	361-554	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	STPCS JOINT VENTURE, LLC	4290	GANADO	TX
—	361-555	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	DIR ASST	TX
—	361-556	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	ONVOY, LLC - TX	903C	ROCKPORT	TX
—	361-557	3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	ROCKPORT	TX
—	361-558	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	C CHRISTI	TX
—	361-560	not yet reported which blocks →	SOUTHWESTERN BELL	9533	C CHRISTI	TX
—	361-561	7XXX9XXX · 2 holders which blocks →	U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS	671J	C CHRISTI	TX
—	361-563	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX	6506	C CHRISTI	TX
—	361-564	0XXX5XXX6XXX7XXX which blocks →	SOUTHWESTERN BELL	9533	YORKTOWN	TX
—	361-566	not yet reported which blocks →	VALLEY TEL. COOP., INC.	2159	ANNAROSE	TX
—	361-568	not yet reported which blocks →	VALLEY TEL. COOP., INC.	2159	ENCINO	TX
—	361-570	5XXX which blocks →	SOUTHWESTERN BELL	9533	VICTORIA	TX
—	361-571	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	VICTORIA	TX
—	361-572	not yet reported which blocks →	SOUTHWESTERN BELL	9533	VICTORIA	TX
—	361-573	not yet reported which blocks →	SOUTHWESTERN BELL	9533	VICTORIA	TX
—	361-574	not yet reported which blocks →	SOUTHWESTERN BELL	9533	VICTORIA	TX
—	361-575	9XXX which blocks →	SOUTHWESTERN BELL	9533	VICTORIA	TX
—	361-576	7XXX which blocks →	SOUTHWESTERN BELL	9533	VICTORIA	TX
—	361-578	not yet reported which blocks →	SOUTHWESTERN BELL	9533	VICTORIA	TX
—	361-579	1XXX2XXX3XXX7XXX · 4 holders which blocks →	SOUTHWESTERN BELL	9533	VICTORIA	TX
—	361-580	0XXX which blocks →	SOUTHWESTERN BELL	9533	VICTORIA	TX
—	361-582	6XXX9XXX · 2 holders which blocks →	SOUTHWESTERN BELL	9533	VICTORIA	TX
—	361-584	0XXX7XXX9XXX which blocks →	FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS	4344	BISHOP	TX
—	361-586	not yet reported which blocks →	VALLEY TEL. COOP., INC.	2159	MIRANDO CY	TX
—	361-588	0XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks →	FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS	4344	BLESSING	TX
—	361-589	0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks →	TWC IP ENABLED SERVICES, LLC	793K	PADRE IS	TX
—	361-592	not yet reported which blocks →	SOUTHWESTERN BELL	9533	KINGSVILLE	TX
—	361-593	0XXX6XXX9XXX · 2 holders which blocks →	SOUTHWESTERN BELL	9533	KINGSVILLE	TX
—	361-594	0XXX5XXX6XXX7XXX · 4 holders which blocks →	SOUTHWESTERN BELL	9533	SHINER	TX
—	361-595	3XXX6XXX · 2 holders which blocks →	SOUTHWESTERN BELL	9533	KINGSVILLE	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.