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
2006-05-01 641-795 not yet reported which blocks → FARMERS TEL. CO. 1177 LTL CEDAR IA
2006-05-01 641-992 not yet reported which blocks → FARMERS TEL. CO. 1177 LTL CEDAR IA
2006-03-24 641-909 0XXX2XXX4XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 LAKE MILLS IA
2005-12-31 641-251 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → T-MOBILE USA, INC. 6529 FORESTCITY IA
2005-12-01 641-826 not yet reported which blocks → FARMERS TEL. CO. 1177 LTL CEDAR IA
2005-12-01 641-827 not yet reported which blocks → FARMERS TEL. CO. 1177 NEW HAVEN IA
2005-08-30 641-323 0–9 XXXall 10 · 6 holders which blocks → WINNEBAGO COOPERATIVE TELEPHONE ASSOCIATION - IA 6103 NORTHWOOD IA
2005-06-17 641-903 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 MASON CITY IA
2005-05-13 641-715 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - IA 221F CHARLES CY IA
2005-02-01 641-316 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - IA 221F IOWA FALLS IA
2004-11-11 641-413 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 LENOX IA
2004-11-11 641-418 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CORNING IA
2004-08-17 641-204 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 PELLA IA
2004-05-06 641-229 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 NEWHAMPTON IA
2004-03-01 641-208 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 BLOOMFIELD IA
2004-01-14 641-207 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LOCAL TELEPHONE DATA SERVICES CORP. 2842 KEOTA IA
2003-09-25 641-234 not yet reported which blocks → IOWA RSA 2 LIMITED PARTNERSHIP DBA CHAT MOBILITY 9572 MOUNT AYR IA
2003-07-17 641-436 2XXX3XXX4XXX5XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CENTERVL IA
2003-07-17 641-481 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 TOLEDO IA
2003-07-17 641-849 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 ELDORA IA
2003-07-17 641-931 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 ALBIA IA
2003-07-14 641-451 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 FAIRFIELD IA
2003-05-01 641-676 9XXX which blocks → MAHASKA COMMUNICATION GROUP, LLC - IA 916A OSKALOOSA IA
2003-04-29 641-221 2XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → UNITED STATES CELLULAR - IA 6266 GREENFIELD IA
2002-07-16 641-373 0–9 XXXall 10 · 2 holders which blocks → UNITED STATES CELLULAR - IA 6266 IOWA FALLS IA
2002-05-07 641-832 0–9 XXXall 10 · 5 holders which blocks → OSAGE MUNICIPAL COMMUNICATIONS UTILITY - IA 9758 OSAGE IA
2002-02-25 641-295 4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → UNITED STATES CELLULAR - IA 6266 OSKALOOSA IA
2002-01-28 641-352 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → PAETEC ITEL, LLC 829J MARSHALLTN IA
2001-10-30 641-332 2XXX3XXX4XXX6XXX · 2 holders which blocks → GUTHRIE TELECOMMUNICATIONS NETWORK, INC. - IA 5840 GUTHRIECTR IA
2001-09-12 641-224 2XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → LOCAL TELEPHONE DATA SERVICES CORP. 2842 SIGOURNEY IA
2001-09-12 641-225 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LOCAL TELEPHONE DATA SERVICES CORP. 2842 EDDYVILLE IA
2001-08-09 641-231 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CLEAR LAKE IA
2001-08-02 641-210 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 MASON CITY IA
2001-07-11 641-226 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OTTUMWA IA
2001-07-11 641-232 2XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LEIGHTON IA
2001-07-11 641-569 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OSKALOOSA IA
2001-07-11 641-583 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MANLY IA
2001-07-11 641-691 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MARSHALLTN IA
2001-06-05 641-230 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PELLA IA
2001-05-23 641-328 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 MARSHALLTN IA
2001-05-15 641-233 5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 FAIRFIELD IA
2001-04-24 641-752 not yet reported which blocks → QWEST CORPORATION 9631 MARSHALLTN IA
2001-04-24 641-753 not yet reported which blocks → QWEST CORPORATION 9631 MARSHALLTN IA
2001-04-24 641-754 not yet reported which blocks → QWEST CORPORATION 9631 MARSHALLTN IA
2001-04-23 641-351 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → METROPCS, INC. 5562 MARSHALLTN IA
2001-04-09 641-201 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 MASON CITY IA
2001-03-20 641-275 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEWTON IA
2001-02-14 641-202 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → UNITED STATES CELLULAR - IA 6266 CRESTON IA
2001-02-14 641-203 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → UNITED STATES CELLULAR - IA 6266 CHARITON IA
2001-02-09 641-455 0XXX2XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 OTTUMWA 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.