NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

16 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 563
ONVOY, LLC - IA 8
IMON COMMUNICATIONS, LLC - IA 3
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 3
NEW CINGULAR WIRELESS PCS, LLC - IL 1
LEVEL 3 COMMUNICATIONS, LLC - IA 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
2018-03-06 563-239-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 DUBUQUE IA
2018-03-06 563-239-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 DUBUQUE IA
2018-03-06 563-261-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 MUSCATINE IA
2018-03-06 563-261-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 MUSCATINE IA
2018-03-05 563-207-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 DUBUQUE IA
2018-02-20 563-200-1XXX 1000–1999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F DAVENPORT IA
2018-02-20 563-800-0XXX 0000–0999Assigned ONVOY, LLC - IA 221F CALMAR IA
2018-02-20 563-800-8XXX 8000–8999Assigned ONVOY, LLC - IA 221F CALMAR IA
2018-02-16 563-239-9XXX 9000–9999Assigned IMON COMMUNICATIONS, LLC - IA 695G DUBUQUE IA
2018-02-16 563-655-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DE WITT IA
2018-02-16 563-876-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EPWORTH IA
2018-02-12 563-396-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 DAVENPORT IA
2018-02-07 563-232-7XXX 7000–7999Assigned NUSO, LLC 551G DAVENPORT IA
2018-02-07 563-261-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 MUSCATINE IA
2018-02-07 563-292-1XXX 1000–1999Assigned AIRUS, INC - IA 423H WEST UNION IA
2018-02-07 563-334-1XXX 1000–1999Assigned AIRUS, INC - IA 423H DECORAH IA
2018-02-07 563-770-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 MUSCATINE IA
2018-01-12 563-206-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CLINTON IA
2017-12-20 563-239-5XXX 5000–5999Assigned ONVOY, LLC - IA 221F DUBUQUE IA
2017-12-20 563-239-6XXX 6000–6999Assigned ONVOY, LLC - IA 221F DUBUQUE IA
2017-12-11 563-206-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLINTON IA
2017-11-16 563-519-5XXX 5000–5999Assigned AUREON COMMUNICATIONS, LLC 444G CLINTON IA
2017-10-18 563-261-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 MUSCATINE IA
2017-10-12 563-232-6XXX 6000–6999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F DAVENPORT IA
2017-10-12 563-425-9XXX 9000–9999Assigned AUREON COMMUNICATIONS, LLC 444G FAYETTE IA
2017-09-29 563-666-6XXX 6000–6999Assigned ONVOY, LLC - IA 221F WALCOTT IA
2017-09-28 563-232-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E DAVENPORT IA
2017-09-12 563-239-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DUBUQUE IA
2017-08-31 563-214-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IA 9877 DAVENPORT IA
2017-08-31 563-214-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DAVENPORT IA
2017-08-22 563-770-3XXX 3000–3999Assigned ONVOY, LLC - IA 221F MUSCATINE IA
2017-08-16 563-261-1XXX 1000–1999Assigned IMON COMMUNICATIONS, LLC - IA 695G MUSCATINE IA
2017-08-16 563-261-7XXX 7000–7999Assigned IMON COMMUNICATIONS, LLC - IA 695G MUSCATINE IA
2017-08-16 563-331-9XXX 9000–9999Assigned AUREON COMMUNICATIONS, LLC 444G TIPTON IA
2017-08-14 563-200-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H DAVENPORT IA
2017-08-14 563-207-8XXX 8000–8999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F DUBUQUE IA
2017-08-08 563-207-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DUBUQUE IA
2017-08-03 563-659-7XXX 7000–7999Assigned UNITED STATES CELLULAR - IA 6266 DE WITT IA
2017-07-20 563-202-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DECORAH IA
2017-07-18 563-207-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - IA 985E DUBUQUE IA
2017-06-27 563-206-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLINTON IA
2017-06-12 563-363-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MANCHESTER IA
2017-06-07 563-949-4XXX 4000–4999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F DAVENPORT IA
2017-05-24 563-207-3XXX 3000–3999Assigned ONVOY, LLC - IA 221F DUBUQUE IA
2017-05-24 563-214-0XXX 0000–0999Assigned ONVOY, LLC - IA 221F DAVENPORT IA
2017-05-16 563-217-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WAUKON IA
2017-05-16 563-412-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WEST UNION IA
2017-05-16 563-767-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J VOLGA IA
2017-05-16 563-774-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WADENA IA
2017-05-16 563-776-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WAUCOMA 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.