NumberResearch Membership · Data 09/20/2026

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 641
WINDSTREAM IOWA COMMUNICATIONS, INC. 60
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 46
UNITED STATES CELLULAR - IA 39
WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 32
QWEST CORPORATION 30
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
— 641-767 2XXX3XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 REDDING IA
— 641-768 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 MACKSBURG IA
— 641-772 2XXX5XXX6XXX7XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 TINGLEY IA
— 641-773 3XXX8XXX · 2 holders which blocks → GRAND RIVER MUTUAL TEL CO 1888 GRANDRIVER IA
— 641-774 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 CHARITON IA
— 641-775 not yet reported which blocks → ROCKWELL COOP. TEL. ASSN. 1282 BRISTOW IA
— 641-777 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 OTTUMWA IA
— 641-780 8XXX9XXX which blocks → UNITED STATES CELLULAR - IA 6266 PELLA IA
— 641-781 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 NEWTON IA
— 641-782 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 CRESTON IA
— 641-783 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 KELLERTON IA
— 641-784 none assigned yet which blocks → GRAND RIVER MUTUAL TEL CO 1888 LAMONI IA
— 641-785 3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 BENTON IA
— 641-787 7XXX which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 NEWTON IA
— 641-788 4XXX8XXX · 2 holders which blocks → GRAND RIVER MUTUAL TEL CO 1888 BLOCKTON IA
— 641-790 1XXX7XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 SIGOURNEY IA
— 641-791 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 NEWTON IA
— 641-792 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 NEWTON IA
— 641-793 not yet reported which blocks → REASNOR TELEPHONE COMPANY, LLC 739D REASNOR IA
— 641-794 not yet reported which blocks → ROCKWELL COOP. TEL. ASSN. 1282 DOUGHERTY IA
— 641-797 not yet reported which blocks → WINNEBAGO COOP. TEL. ASSN. - IA 1337 FERTILE IA
— 641-798 not yet reported which blocks → KILLDUFF TELEPHONE COMPANY 747C KILLDUFF IA
— 641-799 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 OTTUMWA IA
— 641-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 641-814 1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 5 holders which blocks → LOCAL TELEPHONE DATA SERVICES CORP. 2842 OTTUMWA IA
— 641-816 1XXX7XXX · 2 holders which blocks → OMNITEL COMMUNICATIONS, INC. - IA 3620 GREENE IA
— 641-820 2XXX3XXX4XXX6XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 KNOXVILLE IA
— 641-821 2XXX which blocks → METROPCS, INC. 5562 GRINNELL IA
— 641-822 not yet reported which blocks → ROCKWELL COOP. TEL. ASSN. 1282 ROCKWELL IA
— 641-823 2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 GREENE IA
— 641-828 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 KNOXVILLE IA
— 641-829 not yet reported which blocks → VENTURA TEL. CO., INC. 1322 VENTURA IA
— 641-831 1XXX2XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 NEWTON IA
— 641-840 4XXX5XXX7XXX8XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 NEWTON IA
— 641-841 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 9 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 NEWTON IA
— 641-842 none assigned yet which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 KNOXVILLE IA
— 641-843 0XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 BRITT IA
— 641-844 3XXX4XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9631 MARSHALLTN IA
— 641-845 not yet reported which blocks → WINNEBAGO COOP. TEL. ASSN. - IA 1337 KENSETT IA
— 641-847 0XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9631 ACKLEY IA
— 641-853 not yet reported which blocks → FRONTIER COMMUNICATIONS OF IOWA, INC. 1127 ROWAN IA
— 641-856 7XXX9XXX which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 CENTERVL IA
— 641-857 not yet reported which blocks → DUMONT TEL. CO. 1152 DUMONT IA
— 641-858 0XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA 1297 ELDORA IA
— 641-860 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 BRITT IA
— 641-861 not yet reported which blocks → T-MOBILE USA, INC. 6529 PELLA IA
— 641-862 2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 WILLIAMSON IA
— 641-863 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 BRITT IA
— 641-864 not yet reported which blocks → HUBBARD COOP. TEL. ASSN. 1203 HUBBARD IA
— 641-866 not yet reported which blocks → FRONTIER COMMUNICATIONS OF IOWA, INC. 1127 COULTER 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.