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
2017-02-22 563-207-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DUBUQUE IA
2017-02-14 563-657-1XXX 1000–1999Assigned CS TECHNOLOGIES, INC. - IA 204A WALCOTT IA
2017-01-13 563-207-0XXX 0000–0999Assigned UNITED STATES CELLULAR - IA 6266 DUBUQUE IA
2017-01-13 563-207-1XXX 1000–1999Assigned UNITED STATES CELLULAR - IA 6266 DUBUQUE IA
2017-01-10 563-770-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 MUSCATINE IA
2016-12-28 563-239-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IA 9877 DUBUQUE IA
2016-11-23 563-214-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DAVENPORT IA
2016-11-14 563-253-9XXX 9000–9999Assigned WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 TIPTON IA
2016-10-13 563-794-9XXX 9000–9999Assigned AUREON COMMUNICATIONS, LLC 444G WAUKON IA
2016-09-23 563-239-1XXX 1000–1999Assigned MCC TELEPHONY OF IOWA, LLC - IA 751F DUBUQUE IA
2016-09-21 563-521-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MAQUOKETA IA
2016-09-15 563-412-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WEST UNION IA
2016-09-15 563-726-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAVENPORT IA
2016-09-15 563-770-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSCATINE IA
2016-09-13 563-228-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BELLEVUE IA
2016-09-13 563-649-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IA 9877 ATALISSA IA
2016-09-07 563-331-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IA 9877 TIPTON IA
2016-09-07 563-657-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WALCOTT IA
2016-09-07 563-855-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WORTHINGTN IA
2016-09-06 563-220-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SABULA IA
2016-09-06 563-724-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MOSCOW IA
2016-09-06 563-770-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MUSCATINE IA
2016-09-06 563-945-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J STANWOOD IA
2016-09-06 563-946-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ROCHESTER IA
2016-09-02 563-522-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LOW MOOR IA
2016-09-02 563-635-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IA 9877 LE CLAIRE IA
2016-09-02 563-853-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LUXEMBURG IA
2016-09-02 563-870-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HOLY CROSS IA
2016-09-02 563-944-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LOWDEN IA
2016-09-01 563-206-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CLINTON IA
2016-09-01 563-221-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DE WITT IA
2016-09-01 563-230-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DYERSVILLE IA
2016-09-01 563-235-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DUBUQUE IA
2016-09-01 563-674-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DELMAR IA
2016-09-01 563-744-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FARLEY IA
2016-09-01 563-785-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DURANT IA
2016-09-01 563-876-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J EPWORTH IA
2016-09-01 563-923-8XXX 8000–8999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J EARLVILLE IA
2016-08-30 563-677-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CHARLOTTE IA
2016-08-30 563-893-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BENNETT IA
2016-08-29 563-422-4XXX 4000–4999Assigned UNITED STATES CELLULAR - IA 6266 WEST UNION IA
2016-08-29 563-949-3XXX 3000–3999Assigned UNITED STATES CELLULAR - IA 6266 DAVENPORT IA
2016-08-26 563-230-9XXX 9000–9999Assigned WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 DYERSVILLE IA
2016-08-03 563-514-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAVENPORT IA
2016-08-03 563-514-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAVENPORT IA
2016-08-02 563-235-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DUBUQUE IA
2016-08-02 563-876-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EPWORTH IA
2016-07-14 563-232-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DAVENPORT IA
2016-07-05 563-232-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAVENPORT IA
2016-07-05 563-232-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAVENPORT 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.