NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 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, all time — NPA 573
CENTURYLINK COMMUNICATIONS, LLC 31
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
2018-07-10 573-691-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J JEFFERSNCY MO
2016-04-11 573-554-1XXX 1000–1999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COLUMBIA MO
2015-10-02 573-702-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BLOOMSDALE MO
2014-12-17 573-720-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BLYTHEVL MO
2014-06-27 573-229-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J META MO
2014-06-27 573-553-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WESTPHALIA MO
2014-06-27 573-744-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FREEBURG MO
2014-06-23 573-328-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J QULIN MO
2014-06-23 573-401-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ST MARYS MO
2014-06-23 573-599-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J TUSCUMBIA MO
2014-06-20 573-390-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J OLDAPPLETN MO
2014-06-20 573-448-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J GIDEON MO
2014-06-20 573-688-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LILBOURN MO
2014-06-20 573-717-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J KENNETT MO
2014-06-19 573-360-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J E PRAIRIE MO
2014-06-19 573-362-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FISK MO
2014-06-17 573-313-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BENTON MO
2014-06-17 573-350-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J DELTA MO
2014-06-17 573-534-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BONNETERRE MO
2014-06-17 573-733-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BELL CITY MO
2014-06-17 573-734-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J BISMARCK MO
2013-11-01 573-745-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J LKOZKOSBCH MO
2013-09-18 573-261-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ST JAMES MO
2013-09-18 573-842-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WAYNESVL MO
2013-09-17 573-773-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J PALMYRA MO
2013-09-13 573-677-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CUBA MO
2013-08-06 573-488-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ASHLAND MO
2013-05-14 573-469-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J JEFFERSNCY MO
2013-05-03 573-554-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J COLUMBIA MO
2013-04-25 573-590-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FULTON MO
2013-03-27 573-612-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ROLLA MO

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.