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
2010-12-08	515-612	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	DES MOINES	IA
2010-12-08	515-619	0–9 XXXall 10 · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IA	9877	DES MOINES	IA
2010-07-07	515-802	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
2010-04-26	515-535	0–9 XXXwhole prefix which blocks →	QWEST CORPORATION	9631	DES MOINES	IA
2010-04-16	515-765	1XXX5XXX · 2 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	BANCROFT	IA
2010-03-10	515-653	1XXX3XXX · 2 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	BURT	IA
2010-03-10	515-705	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IA	9877	WINTERSET	IA
2010-03-08	515-216	0–9 XXXall 10 · 5 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2010-03-08	515-260	0XXX1XXX · 2 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	MOORLAND	IA
2010-03-08	515-412	0–9 XXXall 10 · 6 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2010-03-08	515-445	0XXX1XXX2XXX4XXX5XXX6XXX9XXX · 4 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	HUXLEY	IA
2010-03-08	515-493	0–9 XXXall 10 · 4 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	WINTERSET	IA
2010-03-08	515-497	0–9 XXXall 10 · 4 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	PRAIRIE CY	IA
2010-03-08	515-519	0–9 XXXall 10 · 3 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	RUNNELLS	IA
2010-03-08	515-589	0XXX1XXX5XXX8XXX · 4 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	WOODWARD	IA
2010-03-08	515-809	0–9 XXXall 10 · 4 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2010-03-08	515-837	1XXX4XXX7XXX · 3 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	BARNUM	IA
2010-03-08	515-843	1XXX3XXX4XXX · 3 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	CLARE	IA
2010-03-08	515-850	0–9 XXXall 10 · 5 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2010-02-16	515-528	0–9 XXXall 10 · 3 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2009-12-30	515-376	0–9 XXXwhole prefix which blocks →	QWEST CORPORATION	9631	DES MOINES	IA
2009-11-25	515-342	0–9 XXXwhole prefix which blocks →	QWEST CORPORATION	9631	DES MOINES	IA
2009-10-14	515-782	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
2009-08-28	515-344	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
2009-06-03	515-635	0–9 XXXall 10 · 6 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - IA	8344	DES MOINES	IA
2009-05-07	515-337	0–9 XXXall 10 · 5 holders which blocks →	QWEST CORPORATION	9631	AMES	IA
2008-12-17	515-954	0–9 XXXall 10 · 5 holders which blocks →	WINDSTREAM IT-COMM, LLC - IA	938D	DES MOINES	IA
2008-12-15	515-657	0–9 XXXall 10 · 5 holders which blocks →	T-MOBILE USA, INC.	6529	DES MOINES	IA
2008-11-14	515-478	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	UNITED STATES CELLULAR - IA	6266	ADEL	IA
2008-11-14	515-726	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	UNITED STATES CELLULAR - IA	6266	PERRY	IA
2008-09-04	515-661	0–9 XXXall 10 · 5 holders which blocks →	PAETEC ITEL, LLC	829J	DES MOINES	IA
2008-07-24	515-724	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - IA	221F	DES MOINES	IA
2008-05-28	515-423	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	DES MOINES	IA
2007-12-21	515-897	0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks →	ONVOY, LLC - IA	221F	DES MOINES	IA
2007-12-18	515-864	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC - IA	221F	DES MOINES	IA
2007-10-17	515-343	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks →	QWEST CORPORATION	9631	DES MOINES	IA
2007-07-24	515-822	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	DES MOINES	IA
2007-06-14	515-868	0–9 XXXall 10 · 4 holders which blocks →	AUREON COMMUNICATIONS, LLC	444G	DES MOINES	IA
2007-05-23	515-943	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	DES MOINES	IA
2007-04-18	515-494	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	DES MOINES	IA
2007-03-13	515-783	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	DES MOINES	IA
2006-11-01	515-447	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	DES MOINES	IA
2006-10-23	515-456	1XXX4XXX5XXX · 3 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	BANCROFT	IA
2006-10-20	515-442	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	INDIANOLA	IA
2006-09-07	515-200	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	ALGONA	IA
2006-08-31	515-215	0–9 XXXall 10 · 6 holders which blocks →	UNITED STATES CELLULAR - IA	6266	NEVADA	IA
2006-08-31	515-422	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	DES MOINES	IA
2006-07-28	515-339	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	DES MOINES	IA
2006-06-29	515-477	1XXX2XXX4XXX7XXX · 4 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	SWEA CITY	IA
2006-04-26	515-333	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	DES MOINES	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.