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
2016-02-09	515-805	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IA	9877	DES MOINES	IA
2016-01-15	515-776	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
2015-12-29	515-206	0–9 XXXall 10 · 7 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IA	9877	FORT DODGE	IA
2015-12-08	515-336	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
2015-11-12	515-499	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
2015-10-09	515-686	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	AMES	IA
2015-09-09	515-322	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
2015-07-15	515-398	0–9 XXXwhole prefix which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IA	9877	DES MOINES	IA
2015-07-07	515-739	0–9 XXXall 10 · 5 holders which blocks →	OMNITEL COMMUNICATIONS, INC. - IA	3620	WINTERSET	IA
2015-07-01	515-878	0–9 XXXwhole prefix which blocks →	QWEST CORPORATION	9631	DES MOINES	IA
2015-06-25	515-335	0–9 XXXall 10 · 4 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	STORY CITY	IA
2015-06-25	515-934	0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	NEVADA	IA
2015-06-09	515-517	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	EARLHAM	IA
2015-04-23	515-526	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	REDFIELD	IA
2015-04-23	515-585	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	VAN METER	IA
2015-03-23	515-444	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - IA	221F	DES MOINES	IA
2014-08-26	515-305	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	DES MOINES	IA
2014-05-29	515-454	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	STUART	IA
2014-05-28	515-219	0–9 XXXall 10 · 6 holders which blocks →	QWEST CORPORATION	9631	ADEL	IA
2014-05-28	515-420	0–9 XXXall 10 · 6 holders which blocks →	QWEST CORPORATION	9631	POLK CITY	IA
2014-03-07	515-414	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - IA	221F	DES MOINES	IA
2013-12-26	515-346	0–9 XXXall 10 · 5 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	DES MOINES	IA
2013-10-22	515-808	0–9 XXXall 10 · 7 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - IA	8344	INDIANOLA	IA
2013-09-20	515-443	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
2013-07-24	515-512	0–9 XXXall 10 · 6 holders which blocks →	UNITED STATES CELLULAR - IA	6266	DES MOINES	IA
2013-07-17	515-642	0–9 XXXall 10 · 6 holders which blocks →	MINBURN TELEPHONE COMPANY - IA	143H	PERRY	IA
2013-03-21	515-330	0–9 XXXall 10 · 4 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2013-03-13	515-357	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	AMES	IA
2013-01-23	515-631	0–9 XXXall 10 · 5 holders which blocks →	QWEST CORPORATION	9631	DES MOINES	IA
2012-11-29	515-518	0–9 XXXall 10 · 4 holders which blocks →	QWEST CORPORATION	9631	DES MOINES	IA
2012-11-12	515-800	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks →	ONVOY, LLC - IA	221F	COLFAX	IA
2012-11-05	515-608	0–9 XXXall 10 · 4 holders which blocks →	NUSO, LLC	551G	DES MOINES	IA
2012-11-02	515-393	0–9 XXXall 10 · 5 holders which blocks →	UNITED STATES CELLULAR - IA	6266	DES MOINES	IA
2012-08-07	515-218	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
2012-08-03	515-446	0–9 XXXall 10 · 4 holders which blocks →	QWEST CORPORATION	9631	DES MOINES	IA
2012-07-23	515-207	0–9 XXXall 10 · 2 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2012-06-19	515-329	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	POLK CITY	IA
2012-02-24	515-918	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	DES MOINES	IA
2011-11-23	515-717	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	ONVOY, LLC - IA	221F	DALLAS CTR	IA
2011-09-23	515-829	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
2011-08-16	515-505	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
2011-07-22	515-303	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	INDIANOLA	IA
2011-07-22	515-803	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	DES MOINES	IA
2011-05-26	515-639	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	DES MOINES	IA
2011-05-10	515-599	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	GRANGER	IA
2011-04-15	515-609	5XXX which blocks →	GREENWAY COMMUNICATIONS L.L.C. - IA	860F	CORWITH	IA
2011-03-23	515-777	0–9 XXXall 10 · 4 holders which blocks →	AUREON COMMUNICATIONS, LLC	444G	DES MOINES	IA
2011-03-22	515-525	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	DES MOINES	IA
2011-03-02	515-318	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	DES MOINES	IA
2010-12-08	515-421	0–9 XXXall 10 · 5 holders which blocks →	WINDSTREAM IT-COMM, LLC - IA	938D	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.