Recent prefix assignments

341 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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

8X8, INC. 43

NEW CINGULAR WIRELESS PCS, LLC - DC 26

Rogers Communications Canada Inc. (Wireless) 23

NEW CINGULAR WIRELESS PCS, LLC - IL 22

ONVOY, LLC - CA 21

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
—	641-333	not yet reported which blocks →	FRONTIER COMMUNICATIONS OF IOWA, INC.	1127	LENOX	IA
—	641-335	0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	PRESCOTT	IA
—	641-336	3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	CLEARFIELD	IA
—	641-337	0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	ORIENT	IA
—	641-338	8XXX which blocks →	GRAND RIVER MUTUAL TEL CO	1888	THAYER	IA
—	641-339	3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	SHANNON CY	IA
—	641-340	not yet reported which blocks →	IOWA RSA 2 LIMITED PARTNERSHIP DBA CHAT MOBILITY	9572	OSCEOLA	IA
—	641-342	not yet reported which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	OSCEOLA	IA
—	641-343	2XXX8XXX · 2 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS	1170	GREENFIELD	IA
—	641-344	none assigned yet which blocks →	UNITED STATES CELLULAR - IA	6266	CRESTON	IA
—	641-345	not yet reported which blocks →	COON VALLEY COOP. TEL. ASSN., INC.	1137	NEVINVILLE	IA
—	641-346	0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	ARISPE	IA
—	641-347	0XXX2XXX3XXX4XXX6XXX7XXX9XXX · 6 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	AFTON	IA
—	641-348	0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	KENT	IA
—	641-349	not yet reported which blocks →	FRONTIER COMMUNICATIONS OF IOWA, INC.	1127	SHARPSBURG	IA
—	641-355	3XXX which blocks →	CLEAR LAKE INDEPENDENT TEL. CO.	1132	CLEAR LAKE	IA
—	641-357	not yet reported which blocks →	CLEAR LAKE INDEPENDENT TEL. CO.	1132	CLEAR LAKE	IA
—	641-358	not yet reported which blocks →	FRONTIER COMMUNICATIONS OF IOWA, INC.	1127	MESERVEY	IA
—	641-363	0XXX2XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS	1170	MINGO	IA
—	641-364	0XXX3XXX8XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	ALTA VISTA	IA
—	641-366	0XXX6XXX7XXX8XXX · 4 holders which blocks →	HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA	1297	CONRAD	IA
—	641-369	0XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS	1170	BRIDGEWTR	IA
—	641-377	6XXX which blocks →	COLO TEL. CO.	1134	COLO	IA
—	641-380	not yet reported which blocks →	QWEST CORPORATION	9631	MASON CITY	IA
—	641-381	1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	NORTHWOOD	IA
—	641-385	0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	COLLINS	IA
—	641-390	4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	NORTHWOOD	IA
—	641-393	0XXX3XXX4XXX5XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	ELMA	IA
—	641-394	7XXX8XXX9XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS	1170	NEWHAMPTON	IA
—	641-395	not yet reported which blocks →	FARMERS MUTUAL TEL. CO. NORA SPRINGS	1172	RUDD	IA
—	641-396	not yet reported which blocks →	FMTC-I35, INC. D/B/A OMNITEL COMMUNICATIONS	1209	ST CHARLES	IA
—	641-397	3XXX6XXX7XXX8XXX · 4 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS	1170	MARBLEROCK	IA
—	641-398	not yet reported which blocks →	FARMERS MUTUAL TEL. CO. NORA SPRINGS	1172	FLOYD	IA
—	641-411	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	IA
—	641-414	2XXX3XXX8XXX9XXX which blocks →	UNITED STATES CELLULAR - IA	6266	OSCEOLA	IA
—	641-416	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	T-MOBILE USA, INC.	6529	PELLA	IA
—	641-417	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	T-MOBILE USA, INC.	6529	NEWTON	IA
—	641-420	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	MASON CITY	IA
—	641-421	not yet reported which blocks →	QWEST CORPORATION	9631	MASON CITY	IA
—	641-422	not yet reported which blocks →	QWEST CORPORATION	9631	MASON CITY	IA
—	641-423	not yet reported which blocks →	QWEST CORPORATION	9631	MASON CITY	IA
—	641-424	not yet reported which blocks →	QWEST CORPORATION	9631	MASON CITY	IA
—	641-425	none assigned yet which blocks →	UNITED STATES CELLULAR - IA	6266	MASON CITY	IA
—	641-426	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	CHARLES CY	IA
—	641-427	0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	BAGLEY	IA
—	641-429	0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	JAMAICA	IA
—	641-430	none assigned yet which blocks →	UNITED STATES CELLULAR - IA	6266	MASON CITY	IA
—	641-431	2XXX6XXX8XXX · 3 holders which blocks →	UNITED STATES CELLULAR - IA	6266	YALE	IA
—	641-435	0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	QWEST CORPORATION	9631	NASHUA	IA
—	641-437	2XXX8XXX · 2 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	CENTERVL	IA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.