NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

11 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 573
INTRADO COMMUNICATIONS, LLC 4
ONVOY, LLC - MO 2
BANDWIDTH.COM CLEC, LLC - MO 2
EXIANT COMMUNICATIONS LLC 1
E. RITTER COMMUNICATIONS, LLC 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
2012-09-04 573-454-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E FLAT RIVER MO
2012-09-04 573-517-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E PERRYVILLE MO
2012-08-17 573-466-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROLLA MO
2012-08-17 573-466-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROLLA MO
2012-07-26 573-891-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E DEXTER MO
2012-07-18 573-568-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E BLOOMFIELD MO
2012-07-13 573-447-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 COLUMBIA MO
2012-06-26 573-315-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 FLAT RIVER MO
2012-06-14 573-391-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E PORTAGEVL MO
2012-05-30 573-203-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E SENATH MO
2012-05-23 573-719-7XXX 7000–7999Assigned UNITED STATES CELLULAR - MO 6275 HANNIBAL MO
2012-05-07 573-207-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E GRAVOIS ML MO
2012-05-07 573-354-6XXX 6000–6999Assigned WINDSTREAM MISSOURI, INC. 1885 OXLY MO
2012-05-07 573-479-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E HAYTI MO
2012-05-04 573-427-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E CHARLESTON MO
2012-05-02 573-484-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E BEAUFORT MO
2012-05-01 573-204-9XXX 9000–9999Assigned CHARTER IP ENABLED SERVICES, LLC 792K JACKSON MO
2012-04-26 573-985-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 NEW LONDON MO
2012-04-25 573-212-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E ORAN MO
2012-04-25 573-385-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E LILBOURN MO
2012-03-29 573-567-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MEXICO MO
2012-03-29 573-719-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HANNIBAL MO
2012-03-27 573-397-6XXX 6000–6999Assigned MCC TELEPHONY LLC 593K COLUMBIA MO
2012-03-20 573-483-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E BLOOMSDALE MO
2012-03-07 573-283-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E ESSEX MO
2012-03-05 573-213-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 BOWLNGGREN MO
2012-02-17 573-826-3XXX 3000–3999Assigned CHARTER IP ENABLED SERVICES, LLC 792K FULTON MO
2012-02-07 573-362-3XXX 3000–3999Assigned ONVOY, LLC - MO 093F FISK MO
2012-02-07 573-401-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E ST MARYS MO
2012-02-07 573-564-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E MONTGORYCY MO
2012-02-03 573-397-4XXX 4000–4999Assigned CHARTER IP ENABLED SERVICES, LLC 792K COLUMBIA MO
2012-01-27 573-415-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 JEFFERSNCY MO
2012-01-26 573-608-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 STEGNVIEVE MO
2012-01-25 573-372-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 GRAVOIS ML MO
2012-01-25 573-539-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 VERSAILLES MO
2012-01-23 573-246-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CAMPBELL MO
2012-01-18 573-217-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E CAMPBELL MO
2012-01-12 573-276-0XXX 0000–0999Assigned AT&T ENTERPRISES, LLC 516C MALDEN MO
2012-01-04 573-316-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E CARDWELL MO
2011-12-27 573-667-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E MOREHOUSE MO
2011-12-27 573-824-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E ALTEBGFRHN MO
2011-12-19 573-369-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E TUSCUMBIA MO
2011-12-19 573-887-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E CHAFFEE MO
2011-12-16 573-309-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E BELL CITY MO
2011-12-16 573-328-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E QULIN MO
2011-12-16 573-370-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E GIDEON MO
2011-12-16 573-397-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 COLUMBIA MO
2011-12-08 573-402-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E WARDELL MO
2011-12-08 573-653-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E DEERING MO
2011-12-01 573-454-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 FLAT RIVER 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.