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
2010-03-02 641-451-6XXX 6000–6999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F FAIRFIELD IA
2010-03-02 641-464-8XXX 8000–8999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F MOUNT AYR IA
2010-03-02 641-634-8XXX 8000–8999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F WHAT CHEER IA
2010-03-02 641-637-8XXX 8000–8999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F NEW SHARON IA
2010-03-02 641-652-0XXX 0000–0999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F ELDON IA
2010-03-02 641-766-2XXX 2000–2999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F LUCAS IA
2010-03-02 641-783-0XXX 0000–0999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F KELLERTON IA
2010-03-02 641-932-4XXX 4000–4999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F ALBIA IA
2010-03-02 641-934-8XXX 8000–8999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F BLADENSBG IA
2010-03-02 641-937-8XXX 8000–8999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F AGENCY IA
2010-03-02 641-943-3XXX 3000–3999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F ATTICA IA
2010-03-02 641-944-2XXX 2000–2999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F BUSSEY IA
2010-03-02 641-946-2XXX 2000–2999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F LOVILIA IA
2010-03-02 641-947-7XXX 7000–7999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F MELCHER IA
2009-11-12 641-954-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 OTTUMWA IA
2009-10-26 641-243-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IA 9877 MASON CITY IA
2009-10-02 641-442-5XXX 5000–5999Assigned IOWA RSA 2 LIMITED PARTNERSHIP DBA CHAT MOBILITY 9572 DAVIS CITY IA
2009-10-02 641-442-6XXX 6000–6999Assigned IOWA RSA 2 LIMITED PARTNERSHIP DBA CHAT MOBILITY 9572 DAVIS CITY IA
2009-10-01 641-203-9XXX 9000–9999Assigned UNITED STATES CELLULAR - IA 6266 CHARITON IA
2009-08-27 641-247-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 FONTANELLE IA
2009-06-04 641-289-0XXX 0000–0999Assigned UNITED STATES CELLULAR - IA 6266 LAMONI IA
2009-06-04 641-572-0XXX 0000–0999Assigned UNITED STATES CELLULAR - IA 6266 LEON IA
2009-06-04 641-980-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 OTTUMWA IA
2009-06-04 641-980-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 OTTUMWA IA
2009-03-03 641-479-3XXX 3000–3999Assigned HEART OF IOWA VENTURES, L.L.C. - IA 346F LE GRAND IA
2009-02-18 641-275-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEWTON IA
2009-02-06 641-324-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 NORTHWOOD IA
2009-02-05 641-758-3XXX 3000–3999Assigned HEART OF IOWA VENTURES, L.L.C. - IA 346F MARSHALLTN IA
2009-01-14 641-247-0XXX 0000–0999Assigned UNITED STATES CELLULAR - IA 6266 FONTANELLE IA
2009-01-08 641-464-5XXX 5000–5999Assigned UNITED STATES CELLULAR - IA 6266 MOUNT AYR IA
2009-01-06 641-203-8XXX 8000–8999Assigned UNITED STATES CELLULAR - IA 6266 CHARITON IA
2008-11-07 641-481-3XXX 3000–3999Assigned UNITED STATES CELLULAR - IA 6266 TOLEDO IA
2008-10-21 641-781-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 NEWTON IA
2008-10-03 641-954-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OTTUMWA IA
2008-08-22 641-923-7XXX 7000–7999Assigned ONVOY, LLC - IA 221F GARNER IA
2008-07-30 641-324-7XXX 7000–7999Assigned ONVOY, LLC - IA 221F NORTHWOOD IA
2008-07-30 641-435-7XXX 7000–7999Assigned ONVOY, LLC - IA 221F NASHUA IA
2008-07-30 641-458-7XXX 7000–7999Assigned ONVOY, LLC - IA 221F GENEVA IA
2008-07-30 641-583-7XXX 7000–7999Assigned ONVOY, LLC - IA 221F MANLY IA
2008-07-30 641-632-7XXX 7000–7999Assigned ONVOY, LLC - IA 221F ROSE HILL IA
2008-07-30 641-732-7XXX 7000–7999Assigned ONVOY, LLC - IA 221F OSAGE IA
2008-07-30 641-843-7XXX 7000–7999Assigned ONVOY, LLC - IA 221F BRITT IA
2008-07-30 641-847-7XXX 7000–7999Assigned ONVOY, LLC - IA 221F ACKLEY IA
2008-06-25 641-980-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 OTTUMWA IA
2008-05-28 641-352-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J MARSHALLTN IA
2008-04-11 641-251-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 FORESTCITY IA
2008-04-11 641-909-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 LAKE MILLS IA
2008-04-02 641-954-1XXX 1000–1999Assigned UNITED STATES CELLULAR - IA 6266 OTTUMWA IA
2008-03-31 641-903-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 MASON CITY IA
2008-03-28 641-352-9XXX 9000–9999Assigned 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.