NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

12 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 319
ONVOY, LLC - IA 6
T-MOBILE USA, INC. 2
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 2
BANDWIDTH.COM CLEC, LLC - IA 2
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
2011-05-24 319-371-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 FT MADISON IA
2011-05-24 319-383-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E IOWA CITY IA
2011-05-24 319-529-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E WATERLOO IA
2011-05-24 319-596-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E WAVERLY IA
2011-05-17 319-450-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2011-05-17 319-529-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WATERLOO IA
2011-05-05 319-214-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E VINTON IA
2011-05-05 319-333-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 IOWA CITY IA
2011-05-05 319-423-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E CEDAR RPDS IA
2011-05-05 319-531-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E CEDAR RPDS IA
2011-05-05 319-531-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E CEDAR RPDS IA
2011-05-05 319-535-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E MT VERNON IA
2011-04-29 319-486-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 WATERLOO IA
2011-04-29 319-499-1XXX 1000–1999Assigned MCC TELEPHONY LLC 593K IOWA CITY IA
2011-04-22 319-333-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 IOWA CITY IA
2011-04-22 319-693-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CEDAR RPDS IA
2011-04-22 319-720-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2011-04-18 319-777-7XXX 7000–7999Assigned AUREON COMMUNICATIONS, LLC 444G CEDAR RPDS IA
2011-04-08 319-826-2XXX 2000–2999Assigned MCC TELEPHONY LLC 593K CEDAR RPDS IA
2011-04-01 319-529-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 WATERLOO IA
2011-03-28 319-499-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 IOWA CITY IA
2011-03-25 319-529-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 WATERLOO IA
2011-03-23 319-383-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 IOWA CITY IA
2011-03-22 319-376-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FT MADISON IA
2011-03-17 319-333-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 IOWA CITY IA
2011-03-17 319-333-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 IOWA CITY IA
2011-03-17 319-529-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WATERLOO IA
2011-03-14 319-596-5XXX 5000–5999Assigned UNITED STATES CELLULAR - IA 6266 WAVERLY IA
2011-03-03 319-450-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2011-03-03 319-450-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2011-03-03 319-450-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2011-03-03 319-883-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 WATERLOO IA
2011-02-24 319-208-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BURLINGTON IA
2011-02-22 319-423-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E CEDAR RPDS IA
2011-02-22 319-450-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E CEDAR RPDS IA
2011-02-10 319-520-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 KEOKUK IA
2011-01-10 319-238-9XXX 9000–9999Assigned UNITED STATES CELLULAR - IA 6266 OELWEIN IA
2011-01-10 319-333-7XXX 7000–7999Assigned ONVOY, LLC - IA 221F IOWA CITY IA
2011-01-06 319-333-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 IOWA CITY IA
2010-12-28 319-529-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 WATERLOO IA
2010-12-28 319-775-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CEDAR RPDS IA
2010-12-28 319-775-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CEDAR RPDS IA
2010-12-13 319-217-4XXX 4000–4999Assigned LOCAL TELEPHONE DATA SERVICES CORP. 2842 MTPLEASANT IA
2010-12-06 319-529-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 WATERLOO IA
2010-11-26 319-774-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IA 9877 CEDAR RPDS IA
2010-11-24 319-529-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 WATERLOO IA
2010-11-24 319-804-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CEDAR RPDS IA
2010-11-19 319-820-1XXX 1000–1999Assigned ONVOY, LLC - IA 221F MONTICELLO IA
2010-11-19 319-984-7XXX 7000–7999Assigned ONVOY, LLC - IA 221F DENVER IA
2010-11-01 319-450-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CEDAR RPDS 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.