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
2011-04-21 573-840-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C POPLAR BLF MO
2011-04-21 573-866-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C PATTON MO
2011-04-21 573-891-2XXX 2000–2999Assigned AT&T ENTERPRISES, LLC 516C DEXTER MO
2011-04-21 573-922-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CARUTHRSVL MO
2011-04-18 573-447-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 COLUMBIA MO
2011-04-18 573-447-8XXX 8000–8999Assigned ONVOY, LLC - MO 093F COLUMBIA MO
2011-04-06 573-333-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E CARUTHRSVL MO
2011-04-06 573-427-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E CHARLESTON MO
2011-03-21 573-719-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HANNIBAL MO
2011-03-15 573-481-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E SIKESTON MO
2011-03-10 573-415-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 JEFFERSNCY MO
2011-03-01 573-469-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JEFFERSNCY MO
2011-03-01 573-664-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FARMINGTON MO
2011-03-01 573-664-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FARMINGTON MO
2011-03-01 573-825-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBIA MO
2011-03-01 573-825-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBIA MO
2011-03-01 573-872-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POPLAR BLF MO
2011-03-01 573-872-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POPLAR BLF MO
2011-02-23 573-525-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C CAMDENTON MO
2011-02-17 573-258-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MO 993E SIKESTON MO
2011-02-04 573-587-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CAPEGIRARD MO
2011-02-04 573-587-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CAPEGIRARD MO
2011-01-11 573-271-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MO 4932 CAPEGIRARD MO
2011-01-11 573-469-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 JEFFERSNCY MO
2011-01-10 573-691-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JEFFERSNCY MO
2011-01-10 573-825-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBIA MO
2011-01-10 573-840-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POPLAR BLF MO
2011-01-10 573-891-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DEXTER MO
2010-12-17 573-608-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 STEGNVIEVE MO
2010-12-17 573-840-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 POPLAR BLF MO
2010-12-13 573-836-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CAMDENTON MO
2010-12-10 573-723-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LKOZKOSBCH MO
2010-12-08 573-644-9XXX 9000–9999Assigned ONVOY, LLC - MO 093F JEFFERSNCY MO
2010-12-07 573-944-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FREDERCKTN MO
2010-11-17 573-755-4XXX 4000–4999Assigned SOUTHWESTERN BELL 9533 JACKSON MO
2010-11-15 573-825-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBIA MO
2010-10-15 573-721-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MEXICO MO
2010-09-28 573-416-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 FULTON MO
2010-09-28 573-944-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 FREDERCKTN MO
2010-09-13 573-854-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POTOSI MO
2010-07-30 573-860-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SULLIVAN MO
2010-07-29 573-324-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BOWLNGGREN MO
2010-07-29 573-327-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 FLAT RIVER MO
2010-07-29 573-416-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 FULTON MO
2010-07-29 573-481-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SIKESTON MO
2010-07-29 573-705-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 FARMINGTON MO
2010-07-29 573-789-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 VERSAILLES MO
2010-07-29 573-846-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PERRYVILLE MO
2010-07-27 573-327-8XXX 8000–8999Assigned CHARTER IP ENABLED SERVICES, LLC 792K FLAT RIVER MO
2010-07-27 573-705-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FARMINGTON 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.