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
—	319-526	0XXX1XXX9XXX · 2 holders which blocks →	QWEST CORPORATION	9631	KEOKUK	IA
—	319-527	8XXX which blocks →	LOUISA COMMUNICATIONS, LC - IA	4650	WAPELLO	IA
—	319-528	2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	DENMARK	IA
—	319-530	none assigned yet which blocks →	UNITED STATES CELLULAR - IA	6266	IOWA CITY	IA
—	319-531	1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	CEDAR RPDS	IA
—	319-533	none assigned yet which blocks →	T-MOBILE USA, INC.	6529	CEDAR RPDS	IA
—	319-540	7XXX8XXX9XXX · 2 holders which blocks →	UNITED STATES CELLULAR - IA	6266	CEDAR RPDS	IA
—	319-541	8XXX which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	IOWA CITY	IA
—	319-545	not yet reported which blocks →	SOUTH SLOPE COOPERATIVE TELEPHONE COMPANY - IA	562E	TIFFIN	IA
—	319-548	not yet reported which blocks →	T-MOBILE USA, INC.	6529	WASHINGTON	IA
—	319-550	0XXX9XXX which blocks →	UNITED STATES CELLULAR - IA	6266	CEDAR RPDS	IA
—	319-551	none assigned yet which blocks →	UNITED STATES CELLULAR - IA	6266	CEDAR RPDS	IA
—	319-553	5XXX6XXX8XXX · 3 holders which blocks →	PAETEC ITEL, LLC	829J	CEDARFALLS	IA
—	319-555	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	DIR ASST	IA
—	319-558	6XXX7XXX8XXX9XXX which blocks →	QWEST CORPORATION	9631	CEDAR RPDS	IA
—	319-560	none assigned yet which blocks →	UNITED STATES CELLULAR - IA	6266	CEDAR RPDS	IA
—	319-572	8XXX which blocks →	UNITED STATES CELLULAR - IA	6266	BURLINGTON	IA
—	319-575	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC - IA	221F	CEDARFALLS	IA
—	319-576	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	PAETEC ITEL, LLC	829J	BURLINGTON	IA
—	319-591	0XXX1XXX2XXX3XXX6XXX8XXX9XXX · 4 holders which blocks →	UNITED STATES CELLULAR - IA	6266	WASHINGTON	IA
—	319-592	not yet reported which blocks →	VAN BUREN TEL. CO., INC.	1319	BONAPARTE	IA
—	319-594	0XXX2XXX which blocks →	T-MOBILE USA, INC.	6529	IOWA CITY	IA
—	319-596	2XXX3XXX4XXX5XXX6XXX8XXX · 6 holders which blocks →	PAETEC ITEL, LLC	829J	WAVERLY	IA
—	319-602	6XXX8XXX · 2 holders which blocks →	ONVOY, LLC - IA	221F	HUDSON	IA
—	319-611	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	IA
—	319-621	none assigned yet which blocks →	T-MOBILE USA, INC.	6529	IOWA CITY	IA
—	319-622	not yet reported which blocks →	SOUTH SLOPE COOP. TEL. CO., INC.	1298	AMANA	IA
—	319-623	not yet reported which blocks →	COOPERATIVE TEL. CO.	1139	LADORA	IA
—	319-624	not yet reported which blocks →	SOUTH SLOPE COOPERATIVE TELEPHONE COMPANY - IA	562E	SOLON	IA
—	319-625	not yet reported which blocks →	SOUTH SLOPE COOP. TEL. CO., INC.	1298	NO LIBERTY	IA
—	319-626	not yet reported which blocks →	SOUTH SLOPE COOP. TEL. CO., INC.	1298	NO LIBERTY	IA
—	319-627	not yet reported which blocks →	WEST LIBERTY TEL. CO.	1332	W LIBERTY	IA
—	319-628	0XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	OXFORD	IA
—	319-629	2XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	LONE TREE	IA
—	319-631	7XXX8XXX9XXX · 2 holders which blocks →	T-MOBILE USA, INC.	6529	IOWA CITY	IA
—	319-632	not yet reported which blocks →	SOUTH SLOPE COOP. TEL. CO., INC.	1298	NO LIBERTY	IA
—	319-634	not yet reported which blocks →	EAST BUCHANAN TEL. COOP.	1156	AURORA	IA
—	319-635	0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	FAIRBANK	IA
—	319-636	6XXX7XXX8XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	HAZLETON	IA
—	319-638	not yet reported which blocks →	ORAN MUTUAL TEL. CO.	1266	ORAN	IA
—	319-639	not yet reported which blocks →	MODERN COOP. TEL. CO.	1247	KINROSS	IA
—	319-640	2XXX3XXX4XXX which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	CEDAR RPDS	IA
—	319-642	0XXX4XXX6XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	MARENGO	IA
—	319-643	not yet reported which blocks →	WEST LIBERTY TEL. CO.	1332	WESTBRANCH	IA
—	319-644	4XXX6XXX8XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	SOLON	IA
—	319-645	0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	TIFFIN	IA
—	319-646	not yet reported which blocks →	WELLMAN COOP. TEL. ASSN.	1329	WELLMAN	IA
—	319-647	not yet reported which blocks →	COOPERATIVE TEL. CO.	1139	VICTOR	IA
—	319-648	6XXX7XXX8XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	RIVERSIDE	IA
—	319-651	0XXX2XXX which blocks →	T-MOBILE USA, INC.	6529	CEDAR RPDS	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.