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 515

ONVOY, LLC - IA 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
—	515-387	2XXX3XXX6XXX7XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	MAXWELL	IA
—	515-388	0XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	ROLAND	IA
—	515-389	not yet reported which blocks →	WEBSTER-CALHOUN COOP. TEL. ASSN.	1328	CHURDAN	IA
—	515-391	2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	JEFFERSON	IA
—	515-392	not yet reported which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	PLEASANTVL	IA
—	515-401	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
—	515-402	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	UNITED STATES CELLULAR - IA	6266	DES MOINES	IA
—	515-408	9XXX which blocks →	UNITED STATES CELLULAR - IA	6266	FORT DODGE	IA
—	515-411	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	IA
—	515-419	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	T-MOBILE USA, INC.	6529	DES MOINES	IA
—	515-428	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks →	QWEST CORPORATION	9631	DAWSON	IA
—	515-432	not yet reported which blocks →	QWEST CORPORATION	9631	BOONE	IA
—	515-433	3XXX which blocks →	QWEST CORPORATION	9631	BOONE	IA
—	515-434	0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	MCCALLSBG	IA
—	515-436	0XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	RIPPEY	IA
—	515-438	none assigned yet which blocks →	MINBURN TELECOMMUNICATIONS, INC.	1158	WOODWARD	IA
—	515-440	not yet reported which blocks →	QWEST CORPORATION	9631	DES MOINES	IA
—	515-441	2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks →	T-MOBILE USA, INC.	6529	AMES	IA
—	515-448	0XXX2XXX6XXX7XXX8XXX · 2 holders which blocks →	QWEST CORPORATION	9631	EAGLEGROVE	IA
—	515-450	5XXX6XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	AMES	IA
—	515-451	2XXX which blocks →	T-MOBILE USA, INC.	6529	AMES	IA
—	515-453	not yet reported which blocks →	QWEST CORPORATION	9631	DES MOINES	IA
—	515-455	not yet reported which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	PLEASANTVL	IA
—	515-457	not yet reported which blocks →	QWEST CORPORATION	9631	DES MOINES	IA
—	515-460	none assigned yet which blocks →	UNITED STATES CELLULAR - IA	6266	AMES	IA
—	515-462	0XXX7XXX8XXX · 2 holders which blocks →	QWEST CORPORATION	9631	WINTERSET	IA
—	515-463	not yet reported which blocks →	WEBSTER-CALHOUN COOP. TEL. ASSN.	1328	KNIERIM	IA
—	515-465	0XXX1XXX6XXX · 3 holders which blocks →	QWEST CORPORATION	9631	PERRY	IA
—	515-467	not yet reported which blocks →	WEBSTER-CALHOUN COOP. TEL. ASSN.	1328	SOMERS	IA
—	515-468	2XXX4XXX5XXX6XXX · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	WINTERSET	IA
—	515-471	not yet reported which blocks →	QWEST CORPORATION	9631	DES MOINES	IA
—	515-480	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
—	515-481	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	PLEASANTVL	IA
—	515-490	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
—	515-491	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
—	515-508	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
—	515-509	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	AMES	IA
—	515-511	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	IA
—	515-520	2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	AMES	IA
—	515-523	0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	QWEST CORPORATION	9631	STUART	IA
—	515-532	0XXX4XXX5XXX7XXX8XXX · 5 holders which blocks →	QWEST CORPORATION	9631	CLARION	IA
—	515-536	not yet reported which blocks →	IOWA NETWORK SVCS INC DBA AUREON NTWK SVCS, INC.	8858	KAMRAR	IA
—	515-537	0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
—	515-538	1XXX2XXX5XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	LAKOTA	IA
—	515-539	not yet reported which blocks →	COOPERATIVE TEL. EXCH.	1303	KAMRAR	IA
—	515-542	none assigned yet which blocks →	WEBSTER-CALHOUN COOP. TEL. ASSN.	1328	BARNUM	IA
—	515-543	not yet reported which blocks →	WEBSTER-CALHOUN COOP. TEL. ASSN.	1328	DUNCOMBE	IA
—	515-544	not yet reported which blocks →	WEBSTER-CALHOUN COOP. TEL. ASSN.	1328	FARNHAMVL	IA
—	515-545	not yet reported which blocks →	WEBSTER-CALHOUN COOP. TEL. ASSN.	1328	BADGER	IA
—	515-546	none assigned yet which blocks →	WEBSTER-CALHOUN COOP. TEL. ASSN.	1328	CLARE	IA

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.