Recent prefix assignments

0 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, 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
2007-02-14	563-725	3XXX5XXX8XXX · 3 holders which blocks →	MCC TELEPHONY LLC	593K	ELGIN	IA
2007-02-14	563-764	3XXX4XXX8XXX9XXX · 4 holders which blocks →	MCC TELEPHONY LLC	593K	OSSIAN	IA
2007-02-04	563-651	none assigned yet which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	OXFORD JCT	IA
2006-12-30	563-447	0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	WALCOTT	IA
2006-11-16	563-537	not yet reported which blocks →	T-MOBILE USA, INC.	6529	MONONA	IA
2006-07-28	563-233	2XXX3XXX7XXX8XXX · 4 holders which blocks →	MCC TELEPHONY LLC	593K	SUMNER	IA
2006-07-27	563-220	0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 6 holders which blocks →	MCC TELEPHONY OF IOWA, LLC - IA	751F	SABULA	IA
2005-05-03	563-657	0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	ONVOY, LLC - IA	221F	WALCOTT	IA
2004-07-14	563-209	0–9 XXXall 10 · 3 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	DAVENPORT	IA
2004-05-06	563-203	3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	CRESCO	IA
2004-04-29	563-272	0–9 XXXall 10 · 5 holders which blocks →	QWEST CORPORATION	9631	MUSCATINE	IA
2003-07-14	563-929	1XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	MANCHESTER	IA
2002-11-27	563-345	not yet reported which blocks →	CS TECHNOLOGIES, INC. - IA	204A	DAVENPORT	IA
2002-10-07	563-321	2XXX3XXX4XXX5XXX6XXX · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	CLINTON	IA
2002-01-10	563-676	0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	T-MOBILE USA, INC.	6529	DAVENPORT	IA
2001-12-08	563-221	0–9 XXXall 10 · 6 holders which blocks →	UNITED STATES CELLULAR - IA	6266	DE WITT	IA
2001-10-30	563-528	2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	T-MOBILE USA, INC.	6529	DAVENPORT	IA
2001-06-18	563-613	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	LOW MOOR	IA
2001-06-05	563-607	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	MUSCATINE	IA
2001-06-05	563-663	3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC - IL	6534	DUBUQUE	IA
2001-04-03	563-542	none assigned yet which blocks →	UNITED STATES CELLULAR - IA	6266	DUBUQUE	IA
2001-03-04	563-513	0–9 XXXall 10 · 4 holders which blocks →	UNITED STATES CELLULAR - IA	6266	DUBUQUE	IA
2001-01-24	563-608	7XXX8XXX which blocks →	UNITED STATES CELLULAR - IA	6266	MANCHESTER	IA
2001-01-04	563-519	5XXX6XXX8XXX · 3 holders which blocks →	PAETEC ITEL, LLC	829J	CLINTON	IA
—	563-204	0–9 XXXall 10 · 4 holders which blocks →	TELNYX LLC	073H	LANSING	IA
—	563-206	0–9 XXXall 10 · 8 holders which blocks →	CENTURYLINK COMMUNICATIONS, LLC	508J	CLINTON	IA
—	563-208	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLC - IA	221F	MUSCATINE	IA
—	563-210	none assigned yet which blocks →	UNITED STATES CELLULAR - IA	6266	DAVENPORT	IA
—	563-211	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	IA
—	563-212	none assigned yet which blocks →	UNITED STATES CELLULAR - IA	6266	CLINTON	IA
—	563-213	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	T-MOBILE USA, INC.	6529	DUBUQUE	IA
—	563-219	0–9 XXXall 10 · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - IA	985E	CLINTON	IA
—	563-225	not yet reported which blocks →	CENTRAL SCOTT TEL.	1125	MCCAUSLAND	IA
—	563-237	0XXX2XXX3XXX4XXX7XXX8XXX · 5 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS	1170	FREDECKSBG	IA
—	563-238	0XXX4XXX6XXX · 3 holders which blocks →	WINDSTREAM IOWA COMMUNICATIONS, INC.	1178	LAWLER	IA
—	563-241	2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks →	QWEST CORPORATION	9631	CLINTON	IA
—	563-242	not yet reported which blocks →	QWEST CORPORATION	9631	CLINTON	IA
—	563-243	not yet reported which blocks →	QWEST CORPORATION	9631	CLINTON	IA
—	563-244	not yet reported which blocks →	QWEST CORPORATION	9631	CLINTON	IA
—	563-245	5XXX which blocks →	ALPINE COMMUNICATIONS, L.C.	1106	ELKADER	IA
—	563-246	not yet reported which blocks →	F&B COMMUNICATIONS, INC.	1160	CALAMUS	IA
—	563-249	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	CLINTON	IA
—	563-252	6XXX which blocks →	ALPINE COMMUNICATIONS, L.C.	1106	GUTTENBERG	IA
—	563-255	not yet reported which blocks →	ALPINE COMMUNICATIONS, L.C.	1106	GARBER	IA
—	563-259	5XXX6XXX7XXX · 3 holders which blocks →	QWEST CORPORATION	9631	CLINTON	IA
—	563-260	none assigned yet which blocks →	UNITED STATES CELLULAR - IA	6266	MUSCATINE	IA
—	563-262	not yet reported which blocks →	QWEST CORPORATION	9631	MUSCATINE	IA
—	563-263	not yet reported which blocks →	QWEST CORPORATION	9631	MUSCATINE	IA
—	563-264	not yet reported which blocks →	QWEST CORPORATION	9631	MUSCATINE	IA
—	563-271	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	6570	DAVENPORT	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.