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
2013-03-27 573-612-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J ROLLA MO
2013-03-26 573-818-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K COLUMBIA MO
2013-03-01 573-953-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIRCH TREE MO
2013-02-22 573-296-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HALLSVILLE MO
2013-02-08 573-922-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CARUTHRSVL MO
2013-02-05 573-525-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 CAMDENTON MO
2013-02-05 573-567-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 MEXICO MO
2013-02-05 573-664-5XXX 5000–5999Assigned SOUTHWESTERN BELL 9533 FARMINGTON MO
2013-01-30 573-324-8XXX 8000–8999Assigned UNITED STATES CELLULAR - MO 6275 BOWLNGGREN MO
2013-01-29 573-818-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBIA MO
2013-01-23 573-603-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K HANNIBAL MO
2013-01-22 573-469-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JEFFERSNCY MO
2013-01-17 573-664-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K FARMINGTON MO
2013-01-03 573-797-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 JEFFERSNCY MO
2012-12-26 573-525-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CAMDENTON MO
2012-12-18 573-567-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 MEXICO MO
2012-12-18 573-612-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 ROLLA MO
2012-12-18 573-828-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 VANDALIA MO
2012-12-18 573-919-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 KENNETT MO
2012-11-26 573-818-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBIA MO
2012-11-16 573-953-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIRCH TREE MO
2012-11-12 573-514-7XXX 7000–7999Assigned MCC TELEPHONY LLC 593K COLUMBIA MO
2012-11-09 573-453-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 SALEM MO
2012-11-07 573-398-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E SCOTT CITY MO
2012-11-06 573-264-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SCOTT CITY MO
2012-11-06 573-370-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C GIDEON MO
2012-11-06 573-391-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C PORTAGEVL MO
2012-11-06 573-416-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C FULTON MO
2012-11-06 573-684-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C WELLSVILLE MO
2012-11-06 573-846-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C PERRYVILLE MO
2012-11-06 573-887-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C CHAFFEE MO
2012-10-19 573-469-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 JEFFERSNCY MO
2012-10-05 573-754-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 LOUISIANA MO
2012-09-28 573-919-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KENNETT MO
2012-09-26 573-933-1XXX 1000–1999Assigned UNITED STATES CELLULAR - MO 6275 CENTRALIA MO
2012-09-24 573-405-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 VIENNA MO
2012-09-21 573-213-2XXX 2000–2999Assigned PEERLESS NETWORK OF MISSOURI, LLC - MO 225F BOWLNGGREN MO
2012-09-21 573-240-6XXX 6000–6999Assigned PEERLESS NETWORK OF MISSOURI, LLC - MO 225F CENTER MO
2012-09-21 573-242-6XXX 6000–6999Assigned PEERLESS NETWORK OF MISSOURI, LLC - MO 225F CLARKSVL MO
2012-09-21 573-312-6XXX 6000–6999Assigned PEERLESS NETWORK OF MISSOURI, LLC - MO 225F ELSBERRY MO
2012-09-21 573-314-9XXX 9000–9999Assigned PEERLESS NETWORK OF MISSOURI, LLC - MO 225F FRANKFORD MO
2012-09-21 573-440-1XXX 1000–1999Assigned PEERLESS NETWORK OF MISSOURI, LLC - MO 225F FREDERCKTN MO
2012-09-21 573-534-0XXX 0000–0999Assigned PEERLESS NETWORK OF MISSOURI, LLC - MO 225F BONNETERRE MO
2012-09-21 573-562-6XXX 6000–6999Assigned PEERLESS NETWORK OF MISSOURI, LLC - MO 225F LEADWOOD MO
2012-09-21 573-665-0XXX 0000–0999Assigned PEERLESS NETWORK OF MISSOURI, LLC - MO 225F PAYNESVL MO
2012-09-21 573-734-0XXX 0000–0999Assigned PEERLESS NETWORK OF MISSOURI, LLC - MO 225F BISMARCK MO
2012-09-10 573-303-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 COLUMBIA MO
2012-09-05 573-842-2XXX 2000–2999Assigned FIDELITY CABLEVISION, LLC 3275 WAYNESVL MO
2012-09-05 573-842-4XXX 4000–4999Assigned FIDELITY CABLEVISION, LLC 3275 WAYNESVL MO
2012-09-04 573-388-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E CAPEGIRARD 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.