NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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, all time — NPA 563
CENTURYLINK COMMUNICATIONS, LLC 56
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
2025-12-22 563-341-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DUBUQUE IA
2023-12-11 563-346-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J 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
2017-05-15 563-233-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J SUMNER IA
2017-05-15 563-428-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RANDALIA IA
2017-05-15 563-569-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PROTIVIN IA
2017-05-15 563-778-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ST LUCAS IA
2017-05-15 563-932-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J RYAN IA
2017-05-15 563-933-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J STRAWBRYPT IA
2017-05-11 563-224-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MAYNARD IA
2017-05-11 563-363-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MANCHESTER IA
2017-05-11 563-566-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LIME SPG IA
2017-05-11 563-605-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J POSTVILLE IA
2017-05-10 563-204-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LANSING IA
2017-05-10 563-237-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FREDECKSBG IA
2017-05-10 563-303-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FAYETTE IA
2017-05-10 563-924-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LAMONT IA
2017-05-10 563-925-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J GREELEY IA
2017-05-10 563-928-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J EDGEWOOD IA
2017-05-09 563-202-3XXX 3000–3999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DECORAH IA
2017-05-09 563-203-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CRESCO IA
2017-05-09 563-429-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ALPHA IA
2017-05-09 563-562-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CALMAR IA
2017-05-09 563-633-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ARLINGTON IA
2017-05-09 563-922-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DELHI IA
2017-02-22 563-207-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DUBUQUE IA
2017-02-22 563-207-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DUBUQUE IA
2016-09-21 563-521-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MAQUOKETA IA
2016-09-13 563-228-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BELLEVUE 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
2016-09-02 563-853-7XXX 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

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.