Recent prefix assignments

1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
2019-09-16	515-858	0–9 XXXall 10 · 5 holders which blocks →	EXIANT COMMUNICATIONS LLC	114J	DES MOINES	IA
2019-08-29	515-466	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks →	ONVOY, LLC - IA	221F	WHITTEMORE	IA
2019-08-28	515-495	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLC - IA	221F	PRAIRIE CY	IA
2019-08-28	515-498	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - IA	221F	LIVERMORE	IA
2019-08-28	515-762	0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	ONVOY, LLC - IA	221F	RUNNELLS	IA
2019-08-27	515-316	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - IA	221F	GILMORE CY	IA
2019-08-27	515-349	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - IA	221F	DALLAS CTR	IA
2019-08-08	515-461	0–9 XXXall 10 · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IA	9877	DES MOINES	IA
2019-08-08	515-553	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	DES MOINES	IA
2019-06-06	515-417	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	FORT DODGE	IA
2019-05-13	515-516	0–9 XXXall 10 · 3 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	BLAIRSBURG	IA
2019-04-30	515-489	0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	JEWELL	IA
2019-03-27	515-706	0–9 XXXall 10 · 5 holders which blocks →	PAETEC ITEL, LLC	829J	DES MOINES	IA
2018-12-27	515-452	0–9 XXXall 10 · 3 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	DES MOINES	IA
2018-10-08	515-732	0–9 XXXall 10 · 3 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	DES MOINES	IA
2018-08-28	515-690	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	IMON COMMUNICATIONS, LLC - IA	695G	INDIANOLA	IA
2018-08-20	515-474	0–9 XXXall 10 · 5 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	WINTERSET	IA
2018-08-15	515-815	0–9 XXXall 10 · 6 holders which blocks →	T-MOBILE USA, INC.	6529	AMES	IA
2018-07-10	515-217	0–9 XXXall 10 · 4 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	DES MOINES	IA
2018-06-20	515-654	0XXX1XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks →	METROPCS, INC.	5562	WEBSTER CY	IA
2018-06-12	515-718	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	DES MOINES	IA
2018-05-31	515-901	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
2018-05-30	515-587	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
2018-04-09	515-949	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	EAGLEGROVE	IA
2018-03-14	515-823	0–9 XXXall 10 · 2 holders which blocks →	VONAGE AMERICA LLC	197D	DES MOINES	IA
2018-03-09	515-630	0–9 XXXall 10 · 2 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2018-03-07	515-719	1XXX8XXX9XXX · 3 holders which blocks →	T-MOBILE USA, INC.	6529	TITONKA	IA
2018-03-07	515-744	4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks →	T-MOBILE USA, INC.	6529	RADCLIFFE	IA
2018-03-06	515-385	0–9 XXXall 10 · 7 holders which blocks →	T-MOBILE USA, INC.	6529	CLARION	IA
2018-03-06	515-902	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks →	T-MOBILE USA, INC.	6529	HUMBOLDT	IA
2018-01-31	515-579	2XXX5XXX9XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	SLATER	IA
2018-01-25	515-410	0–9 XXXall 10 · 7 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	DES MOINES	IA
2017-11-22	515-214	0–9 XXXall 10 · 2 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DES MOINES	IA
2017-11-08	515-620	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	AMES	IA
2017-09-25	515-400	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - IA	221F	DES MOINES	IA
2017-09-05	515-364	0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 4 holders which blocks →	UNITED STATES CELLULAR - IA	6266	GOLDFIELD	IA
2017-08-14	515-204	0–9 XXXall 10 · 4 holders which blocks →	ONVOY SPECTRUM, LLC	624H	DES MOINES	IA
2017-07-24	515-870	0XXX2XXX7XXX8XXX · 4 holders which blocks →	INDEPENDENT NETWORKS, LLC	7215	SWEA CITY	IA
2017-03-29	515-531	0–9 XXXall 10 · 7 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	GRANGER	IA
2017-03-08	515-500	0–9 XXXall 10 · 7 holders which blocks →	INTEGRATED PATH COMMUNCATIONS, LLC - IA	544H	BOONE	IA
2016-11-14	515-380	0–9 XXXall 10 · 2 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	DES MOINES	IA
2016-09-01	515-300	0–9 XXXall 10 · 2 holders which blocks →	QWEST CORPORATION	9631	DES MOINES	IA
2016-08-17	515-601	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DES MOINES	IA
2016-08-12	515-552	0–9 XXXall 10 · 7 holders which blocks →	UNITED STATES CELLULAR - IA	6266	INDIANOLA	IA
2016-07-27	515-582	0–9 XXXall 10 · 7 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS	1170	MADRID	IA
2016-07-15	515-723	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	DES MOINES	IA
2016-06-20	515-715	0–9 XXXall 10 · 6 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	AMES	IA
2016-05-23	515-350	0–9 XXXall 10 · 4 holders which blocks →	UNITED STATES CELLULAR - IA	6266	DES MOINES	IA
2016-03-22	515-750	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLC - IA	221F	DAWSON	IA
2016-03-15	515-721	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	DES MOINES	IA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.