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
— 641-868 6XXX8XXX · 2 holders which blocks → HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA 1297 STEAMBOTRK IA
— 641-869 7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 WELLSBURG IA
— 641-870 none assigned yet which blocks → IOWA RSA 2 LIMITED PARTNERSHIP DBA CHAT MOBILITY 9572 CORYDON IA
— 641-871 2XXX3XXX6XXX7XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 KNOXVILLE IA
— 641-872 not yet reported which blocks → SOUTH CENTRAL COMMUNICATIONS, INC. 1094 CORYDON IA
— 641-873 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 ALLERTON IA
— 641-874 2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PROMISE CY IA
— 641-876 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 LINEVILLE IA
— 641-877 5XXX7XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 HUMESTON IA
— 641-881 7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 LATIMER IA
— 641-888 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 GRINNELL IA
— 641-891 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 KNOXVILLE IA
— 641-892 1XXX2XXX3XXX5XXX6XXX9XXX · 5 holders which blocks → FRONTIER COMMUNICATIONS OF IOWA, INC. 1127 SHEFFIELD IA
— 641-894 not yet reported which blocks → ROCKWELL COOP. TEL. ASSN. 1282 AREDALE IA
— 641-895 8XXX9XXX which blocks → UNITED STATES CELLULAR - IA 6266 CENTERVL IA
— 641-896 not yet reported which blocks → WINNEBAGO COOP. TEL. ASSN. - IA 1337 HANLONTOWN IA
— 641-897 not yet reported which blocks → GRAND RIVER MUTUAL TEL CO 1888 MILLERTON IA
— 641-898 3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 SEYMOUR IA
— 641-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 641-919 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 FAIRFIELD IA
— 641-920 not yet reported which blocks → HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA 1297 STEAMBOTRK IA
— 641-922 not yet reported which blocks → HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA 1297 CONRAD IA
— 641-923 1XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 GARNER IA
— 641-926 not yet reported which blocks → WINNEBAGO COOP. TEL. ASSN. - IA 1337 WODEN IA
— 641-927 not yet reported which blocks → WINNEBAGO COOP. TEL. ASSN. - IA 1337 MILLER IA
— 641-929 not yet reported which blocks → CITIZENS MUTUAL TELEPHONE COOPERATIVE 1129 MARK IA
— 641-932 0XXX4XXX6XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 ALBIA IA
— 641-933 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 FREMONT IA
— 641-934 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 BLADENSBG IA
— 641-935 3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 CHILLICOTH IA
— 641-936 2XXX3XXX5XXX6XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 DOUDS IA
— 641-937 8XXX9XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 AGENCY IA
— 641-938 3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 BLAKESBURG IA
— 641-939 not yet reported which blocks → HEART OF IOWA COMMUNICATIONS COOPERATIVE - IA 1297 ELDORA IA
— 641-942 2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 MILO IA
— 641-943 3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 ATTICA IA
— 641-944 2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 BUSSEY IA
— 641-946 2XXX3XXX4XXX5XXX6XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 LOVILIA IA
— 641-947 7XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 MELCHER IA
— 641-948 not yet reported which blocks → BLUE EARTH VALLEY TEL. CO. 1358 STEVENS IA
— 641-949 2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 TRACY IA
— 641-950 not yet reported which blocks → IA
— 641-954 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 OTTUMWA IA
— 641-958 not yet reported which blocks → MULTIPLE OCN LISTING MULT IA
— 641-959 not yet reported which blocks → MULTIPLE OCN LISTING MULT IA
— 641-969 2XXX6XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 EDDYVILLE IA
— 641-976 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 641-980 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 OTTUMWA IA
— 641-982 not yet reported which blocks → FARMERS TEL. CO. 1177 NEW HAVEN IA
— 641-983 not yet reported which blocks → FARMERS TEL. CO. 1177 LTL CEDAR 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.