Recent prefix assignments

0 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, all time — NPA 563

QWEST CORPORATION 54

UNITED STATES CELLULAR - IA 33

WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 26

T-MOBILE USA, INC. 25

WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 22

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
2016-09-21	563-521	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	MAQUOKETA	IA
2016-09-20	563-207	0–9 XXXall 10 · 7 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	DUBUQUE	IA
2016-08-26	563-230	0–9 XXXall 10 · 5 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	DYERSVILLE	IA
2016-07-28	563-863	not yet reported which blocks →	NEIT SERVICES LLC - IA	859H	POSTVILLE	IA
2016-06-03	563-214	0–9 XXXall 10 · 7 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	DAVENPORT	IA
2016-02-18	563-232	0–9 XXXall 10 · 6 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - IA	8344	DAVENPORT	IA
2015-10-30	563-339	3XXX5XXX9XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS	1170	SUMNER	IA
2015-10-20	563-224	2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	MAYNARD	IA
2015-10-20	563-303	0XXX3XXX7XXX9XXX · 4 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	FAYETTE	IA
2015-10-20	563-482	2XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	LAWLER	IA
2015-10-15	563-235	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DUBUQUE	IA
2015-09-28	563-331	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks →	UNITED STATES CELLULAR - IA	6266	TIPTON	IA
2015-06-25	563-315	2XXX3XXX5XXX8XXX9XXX · 4 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	STRAWBRYPT	IA
2015-06-25	563-363	0–9 XXXall 10 · 7 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	MANCHESTER	IA
2015-06-25	563-635	1XXX3XXX5XXX6XXX7XXX9XXX · 4 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS	1170	LE CLAIRE	IA
2015-06-25	563-655	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS	1170	DE WITT	IA
2015-06-24	563-228	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS	1170	BELLEVUE	IA
2014-03-07	563-293	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLC - IA	221F	DAVENPORT	IA
2013-12-24	563-202	0–9 XXXall 10 · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DECORAH	IA
2013-03-13	563-316	0–9 XXXall 10 · 7 holders which blocks →	CS TECHNOLOGIES, INC. - IA	204A	MUSCATINE	IA
2012-11-05	563-362	0–9 XXXall 10 · 5 holders which blocks →	NUSO, LLC	551G	DAVENPORT	IA
2012-09-28	563-231	0–9 XXXall 10 · 5 holders which blocks →	UNITED STATES CELLULAR - IA	6266	DUBUQUE	IA
2012-01-18	563-313	0–9 XXXall 10 · 5 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	1167	CRESCO	IA
2011-11-23	563-258	0–9 XXXall 10 · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	DUBUQUE	IA
2011-02-14	563-594	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - IA	221F	DAVENPORT	IA
2010-03-19	563-277	0–9 XXXall 10 · 8 holders which blocks →	MCC TELEPHONY LLC	593K	DECORAH	IA
2010-03-19	563-412	0–9 XXXall 10 · 6 holders which blocks →	MCC TELEPHONY LLC	593K	WEST UNION	IA
2010-03-09	563-729	1XXX which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	LE CLAIRE	IA
2010-03-08	563-308	1XXX2XXX9XXX · 3 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	PRESTON	IA
2010-02-16	563-424	0–9 XXXall 10 · 6 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	DAVENPORT	IA
2010-02-16	563-822	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 8 holders which blocks →	MCC TELEPHONY LLC	593K	MANCHESTER	IA
2010-01-14	563-275	0–9 XXXall 10 · 5 holders which blocks →	WINDSTREAM IT-COMM, LLC - IA	938D	DAVENPORT	IA
2009-12-08	563-549	0–9 XXXall 10 · 5 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - IA	8344	DAVENPORT	IA
2009-11-24	563-265	0–9 XXXall 10 · 4 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IA	9877	DAVENPORT	IA
2009-10-26	563-217	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - IA	9877	WAUKON	IA
2009-04-13	563-845	0–9 XXXall 10 · 6 holders which blocks →	AT&T - LOCAL	7421	DUBUQUE	IA
2009-01-07	563-329	0XXX1XXX2XXX3XXX4XXX7XXX9XXX · 6 holders which blocks →	UNITED STATES CELLULAR - IA	6266	MCGREGOR	IA
2008-09-08	563-639	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	DAVENPORT	IA
2008-07-24	563-723	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - IA	221F	DAVENPORT	IA
2008-05-28	563-484	0–9 XXXall 10 · 5 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	DAVENPORT	IA
2007-12-18	563-726	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - IA	221F	DAVENPORT	IA
2007-12-07	563-748	0–9 XXXall 10 · 6 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	MAQUOKETA	IA
2007-09-19	563-794	0–9 XXXall 10 · 6 holders which blocks →	UNITED STATES CELLULAR - IA	6266	WAUKON	IA
2007-03-17	563-454	1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks →	MCC TELEPHONY LLC	593K	WYOMING	IA
2007-03-16	563-223	0XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	ELDRIDGE	IA
2007-03-16	563-694	8XXX which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	GOOSE LAKE	IA
2007-03-16	563-849	8XXX9XXX · 2 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	HESPER	IA
2007-03-16	563-934	0XXX2XXX5XXX6XXX8XXX · 5 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	MILES	IA
2007-02-14	563-358	3XXX9XXX · 2 holders which blocks →	MCC TELEPHONY LLC	593K	FTATKINSON	IA
2007-02-14	563-683	6XXX7XXX8XXX9XXX · 4 holders which blocks →	MCC TELEPHONY LLC	593K	NEW ALBIN	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.