NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

4 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, last 30 days — NPA 641
ONVOY, LLC - IA 2
T-MOBILE USA, INC. 1
NEW CINGULAR WIRELESS PCS, LLC - IL 1
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 thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2006-11-16 641-814-9XXX 9000–9999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F OTTUMWA IA
2006-11-08 641-455-5XXX 5000–5999Assigned QWEST CORPORATION 9631 OTTUMWA IA
2006-11-02 641-229-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 NEWHAMPTON IA
2006-10-26 641-843-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BRITT IA
2006-10-17 641-569-1XXX 1000–1999Assigned LOCAL TELEPHONE DATA SERVICES CORP. 2842 OSKALOOSA IA
2006-10-04 641-210-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 MASON CITY IA
2006-10-02 641-583-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MANLY IA
2006-09-28 641-208-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BLOOMFIELD IA
2006-09-12 641-275-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEWTON IA
2006-08-31 641-210-7XXX 7000–7999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F MASON CITY IA
2006-08-30 641-229-5XXX 5000–5999Assigned UNITED STATES CELLULAR - IA 6266 NEWHAMPTON IA
2006-08-30 641-229-6XXX 6000–6999Assigned UNITED STATES CELLULAR - IA 6266 NEWHAMPTON IA
2006-08-25 641-832-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 OSAGE IA
2006-08-08 641-377-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 COLO IA
2006-08-07 641-210-4XXX 4000–4999Assigned OMNITEL COMMUNICATIONS, INC. - IA 3620 MASON CITY IA
2006-07-26 641-832-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 OSAGE IA
2006-07-24 641-691-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MARSHALLTN IA
2006-05-24 641-858-6XXX 6000–6999Assigned UNITED STATES CELLULAR - IA 6266 ELDORA IA
2006-05-11 641-814-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J OTTUMWA IA
2006-04-05 641-844-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 MARSHALLTN IA
2006-03-23 641-715-0XXX 0000–0999Assigned OMNITEL COMMUNICATIONS, INC. - IA 3620 CHARLES CY IA
2006-03-21 641-275-3XXX 3000–3999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F NEWTON IA
2006-03-01 641-814-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OTTUMWA IA
2006-01-12 641-275-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEWTON IA
2006-01-03 641-210-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 MASON CITY IA
2005-08-31 641-323-7XXX 7000–7999Assigned WINNEBAGO COOPERATIVE TELEPHONE ASSOCIATION - IA 6103 NORTHWOOD IA
2005-07-29 641-233-7XXX 7000–7999Assigned UNITED STATES CELLULAR - IA 6266 FAIRFIELD IA
2005-07-29 641-233-8XXX 8000–8999Assigned UNITED STATES CELLULAR - IA 6266 FAIRFIELD IA
2005-07-27 641-455-8XXX 8000–8999Assigned UNITED STATES CELLULAR - IA 6266 OTTUMWA IA
2005-07-27 641-814-2XXX 2000–2999Assigned UNITED STATES CELLULAR - IA 6266 OTTUMWA IA
2005-07-27 641-814-3XXX 3000–3999Assigned UNITED STATES CELLULAR - IA 6266 OTTUMWA IA
2005-06-29 641-335-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 PRESCOTT IA
2005-06-29 641-336-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CLEARFIELD IA
2005-06-29 641-347-7XXX 7000–7999Assigned IOWA RSA 2 LIMITED PARTNERSHIP DBA CHAT MOBILITY 9572 AFTON IA
2005-05-04 641-414-9XXX 9000–9999Assigned UNITED STATES CELLULAR - IA 6266 OSCEOLA IA
2005-04-25 641-418-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CORNING IA
2005-04-25 641-484-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TOLEDO IA
2005-04-18 641-856-7XXX 7000–7999Assigned UNITED STATES CELLULAR - IA 6266 CENTERVL IA
2005-04-18 641-856-9XXX 9000–9999Assigned UNITED STATES CELLULAR - IA 6266 CENTERVL IA
2005-04-07 641-202-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CRESTON IA
2005-04-07 641-224-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SIGOURNEY IA
2005-04-07 641-343-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 GREENFIELD IA
2005-03-22 641-226-7XXX 7000–7999Assigned UNITED STATES CELLULAR - IA 6266 OTTUMWA IA
2005-03-22 641-226-8XXX 8000–8999Assigned UNITED STATES CELLULAR - IA 6266 OTTUMWA IA
2005-03-17 641-373-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 IOWA FALLS IA
2005-03-17 641-373-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 IOWA FALLS IA
2005-03-07 641-210-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 MASON CITY IA
2005-03-02 641-351-4XXX 4000–4999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F MARSHALLTN IA
2005-03-01 641-201-3XXX 3000–3999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F MASON CITY IA
2005-03-01 641-351-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 MARSHALLTN IA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.