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
— 641-568 not yet reported which blocks → WINNEBAGO COOP. TEL. ASSN. - IA 1337 SCARVILLE IA
— 641-579 not yet reported which blocks → FRONTIER COMMUNICATIONS OF IOWA, INC. 1127 LATIMER IA
— 641-580 1XXX2XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 LATIMER IA
— 641-581 not yet reported which blocks → WINNEBAGO COOP. TEL. ASSN. - IA 1337 FORESTCITY IA
— 641-582 0XXX6XXX7XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 FORESTCITY IA
— 641-584 not yet reported which blocks → WINNEBAGO COOP. TEL. ASSN. - IA 1337 THOMPSON IA
— 641-585 not yet reported which blocks → WINNEBAGO COOPERATIVE TELEPHONE ASSOCIATION - IA 6103 FORESTCITY IA
— 641-586 4XXX5XXX6XXX8XXX · 2 holders which blocks → CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 1123 SOUTHADAMS IA
— 641-587 not yet reported which blocks → COMMUNICATIONS 1 NETWORKS, INC. 1262 KLEMME IA
— 641-588 not yet reported which blocks → WINNEBAGO COOP. TEL. ASSN. - IA 1337 JOICE IA
— 641-590 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 JOICE IA
— 641-591 not yet reported which blocks → WINNEBAGO COOP. TEL. ASSN. - IA 1337 LAKE MILLS IA
— 641-592 not yet reported which blocks → WINNEBAGO COOP. TEL. ASSN. - IA 1337 LAKE MILLS IA
— 641-593 not yet reported which blocks → SEARSBORO TEL. CO., INC. 1292 SEARSBORO IA
— 641-594 not yet reported which blocks → SULLY TEL. ASSN. 1306 SULLY IA
— 641-595 not yet reported which blocks → WINDSTREAM MONTEZUMA, LLC 1248 DEEP RIVER IA
— 641-596 5XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 JOICE IA
— 641-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 641-613 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LOCAL TELEPHONE DATA SERVICES CORP. 2842 PELLA IA
— 641-620 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PELLA IA
— 641-621 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PELLA IA
— 641-622 4XXX6XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 SIGOURNEY IA
— 641-623 not yet reported which blocks → WINDSTREAM MONTEZUMA, LLC 1248 MONTEZUMA IA
— 641-624 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 DELTA IA
— 641-625 2XXX3XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PEORIA IA
— 641-626 2XXX6XXX7XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 LEIGHTON IA
— 641-627 2XXX3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 OTLEY IA
— 641-628 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PELLA IA
— 641-629 8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 PELLA IA
— 641-632 0XXX1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9631 ROSE HILL IA
— 641-634 7XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 WHAT CHEER IA
— 641-635 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 HARPER IA
— 641-636 4XXX5XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 KEOTA IA
— 641-637 3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 NEW SHARON IA
— 641-638 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 OSKALOOSA IA
— 641-640 2XXX3XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 IOWA FALLS IA
— 641-641 not yet reported which blocks → IA
— 641-642 not yet reported which blocks → FARMERS MUTUAL COOP. TEL. CO. 1169 MOULTON IA
— 641-644 not yet reported which blocks → BARNES CITY COOP. TEL. CO. 1108 BARNESCITY IA
— 641-647 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 MYSTIC IA
— 641-648 not yet reported which blocks → QWEST CORPORATION 9631 IOWA FALLS IA
— 641-649 3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PLANO IA
— 641-651 3XXX7XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 PELLA IA
— 641-652 0XXX2XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 ELDON IA
— 641-653 0XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 HEDRICK IA
— 641-655 2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 FARSON IA
— 641-656 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 MILTON IA
— 641-658 3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 CINCINNATI IA
— 641-660 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 OSKALOOSA IA
— 641-661 3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 MARTINSBG 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.