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
WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 32
WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 28
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
2019-10-21 641-327 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 WELLSBURG IA
2016-08-31 641-307 0XXX3XXX6XXX7XXX9XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 GUTHRIECTR IA
2016-07-28 641-432 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 FORESTCITY IA
2015-06-25 641-212 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 GREENFIELD IA
2015-06-25 641-557 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 NEWHAMPTON IA
2015-06-25 641-599 4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 ST ANSGAR IA
2015-06-25 641-659 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 GRINNELL IA
2015-06-25 641-819 0–9 XXXall 10 · 9 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 FAIRFIELD IA
2007-08-21 641-278 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 CRESTON IA
2006-07-13 641-433 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 WHAT CHEER IA
— 641-217 0–9 XXXall 10 · 9 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 CHARITON IA
— 641-223 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 OSCEOLA IA
— 641-236 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 GRINNELL IA
— 641-259 4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 MONROE IA
— 641-269 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 GRINNELL IA
— 641-335 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 PRESCOTT IA
— 641-336 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 CLEARFIELD IA
— 641-337 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 ORIENT IA
— 641-339 3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 SHANNON CY IA
— 641-342 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 OSCEOLA IA
— 641-343 2XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 GREENFIELD IA
— 641-346 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 ARISPE IA
— 641-347 0XXX2XXX3XXX4XXX6XXX7XXX9XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 AFTON IA
— 641-348 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 KENT IA
— 641-363 0XXX2XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 MINGO IA
— 641-364 0XXX3XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 ALTA VISTA IA
— 641-369 0XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 BRIDGEWTR IA
— 641-385 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 COLLINS IA
— 641-393 0XXX3XXX4XXX5XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 ELMA IA
— 641-394 7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 NEWHAMPTON IA
— 641-397 3XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 MARBLEROCK IA
— 641-427 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 BAGLEY IA
— 641-429 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 JAMAICA IA
— 641-437 2XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 CENTERVL IA
— 641-449 2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 NEWVIRGINI IA
— 641-452 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 UNIONVILLE IA
— 641-464 5XXX6XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 MOUNT AYR IA
— 641-466 2XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 LIBERTYCTR IA
— 641-469 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 FAIRFIELD IA
— 641-470 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 FAIRFIELD IA
— 641-472 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 FAIRFIELD IA
— 641-473 0XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 GLADBROOK IA
— 641-479 0XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 LE GRAND IA
— 641-484 0XXX which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 TOLEDO IA
— 641-489 3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 CHELSEA IA
— 641-492 2XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 MONTOUR IA
— 641-499 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 GARWIN IA
— 641-528 0XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 MALCOM IA
— 641-534 2XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 LACONA IA
— 641-535 0XXX3XXX5XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 RUSSELL 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.