NumberResearch Membership · Data 09/19/2026

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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 563-767 5XXX6XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 VOLGA IA
— 563-770 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 MUSCATINE IA
— 563-773 not yet reported which blocks → LA MOTTE TEL. CO. 1222 LAMOTTE IA
— 563-774 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 WADENA IA
— 563-776 0XXX5XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 WAUCOMA IA
— 563-777 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 SABULA IA
— 563-778 0XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 ST LUCAS IA
— 563-779 not yet reported which blocks → IA
— 563-783 not yet reported which blocks → NORTHEAST IOWA TEL. CO. 1230 ST OLAF IA
— 563-785 2XXX3XXX5XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 DURANT IA
— 563-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 563-815 not yet reported which blocks → IA
— 563-823 not yet reported which blocks → PAETEC ITEL, LLC 829J DAVENPORT IA
— 563-826 not yet reported which blocks → LOST NATION-ELWOOD TEL. CO. 1229 OXFORD JCT IA
— 563-843 not yet reported which blocks → DIXON ACQUISITION, LLC 1150 DIXON IA
— 563-847 not yet reported which blocks → GRAND MOUND COOP. TEL. ASSN. 1191 GRANDMOUND IA
— 563-852 not yet reported which blocks → CASCADE COMMUNICATIONS COMPANY 1118 CASCADE IA
— 563-853 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 LUXEMBURG IA
— 563-855 0XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 WORTHINGTN IA
— 563-856 0XXX6XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 COLESBURG IA
— 563-864 not yet reported which blocks → CENTURYTEL OF POSTVILLE, INC. DBA CENTURYLINK 1274 POSTVILLE IA
— 563-870 0XXX6XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 HOLY CROSS IA
— 563-872 2XXX6XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 BELLEVUE IA
— 563-873 not yet reported which blocks → ALPINE COMMUNICATIONS, L.C. 1106 MCGREGOR IA
— 563-875 0XXX3XXX4XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 DYERSVILLE IA
— 563-876 0XXX2XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 EPWORTH IA
— 563-879 not yet reported which blocks → BERNARD TEL. CO., INC. 1110 BERNARD IA
— 563-880 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 MCGREGOR IA
— 563-883 not yet reported which blocks → HARMONY TEL. CO. 1404 SO HARMONY IA
— 563-884 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-886 4XXX5XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 TIPTON IA
— 563-888 1XXX5XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-889 not yet reported which blocks → T-MOBILE USA, INC. 6529 TIPTON IA
— 563-890 not yet reported which blocks → F&B COMMUNICATIONS, INC. - IA 4245 BENNETT IA
— 563-893 3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 BENNETT IA
— 563-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 563-920 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 MANCHESTER IA
— 563-921 0XXX5XXX6XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 NEW VIENNA IA
— 563-922 0XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 DELHI IA
— 563-923 0XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 EARLVILLE IA
— 563-924 0XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 LAMONT IA
— 563-925 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 GREELEY IA
— 563-926 0XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 HOPKINTON IA
— 563-927 0XXX which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 MANCHESTER IA
— 563-928 0XXX2XXX3XXX4XXX5XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 EDGEWOOD IA
— 563-932 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 RYAN IA
— 563-933 0XXX3XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 STRAWBRYPT IA
— 563-940 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DAVENPORT IA
— 563-941 not yet reported which blocks → F&B COMMUNICATIONS, INC. - IA 4245 LOWDEN IA
— 563-942 not yet reported which blocks → CEDAR COMMUNICATIONS, LLC 4796 STANWOOD 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.