NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

1 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, last 30 days — NPA 312
BANDWIDTH.COM CLEC, LLC - IL 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
2019-06-06 312-668-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2019-06-06 312-668-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2019-05-28 312-668-2XXX 2000–2999Assigned CSC WIRELESS, LLC 425J CHICGOZN01 IL
2019-05-14 312-779-0XXX 0000–0999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-05-14 312-779-1XXX 1000–1999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-05-09 312-210-7XXX 7000–7999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-05-09 312-210-8XXX 8000–8999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-05-09 312-210-9XXX 9000–9999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-05-09 312-872-3XXX 3000–3999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-05-09 312-872-4XXX 4000–4999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-05-09 312-872-7XXX 7000–7999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-05-09 312-872-8XXX 8000–8999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-05-09 312-900-8XXX 8000–8999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-05-01 312-741-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2019-04-30 312-776-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2019-04-30 312-776-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2019-04-22 312-776-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2019-04-22 312-776-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2019-04-18 312-900-9XXX 9000–9999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2019-04-05 312-598-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2019-03-21 312-598-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2019-03-21 312-598-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2019-03-21 312-598-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2019-03-21 312-598-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2019-02-06 312-604-5XXX 5000–5999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2019-01-31 312-776-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-31 312-776-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-31 312-776-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-31 312-776-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-31 312-776-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-31 312-776-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-28 312-284-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-28 312-284-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-28 312-598-0XXX 0000–0999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-01-28 312-598-1XXX 1000–1999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-01-28 312-598-2XXX 2000–2999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-01-28 312-598-3XXX 3000–3999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-01-28 312-598-4XXX 4000–4999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-01-28 312-900-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-28 312-900-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-28 312-900-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-28 312-900-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-28 312-900-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-28 312-900-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-28 312-900-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-28 312-960-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2019-01-23 312-736-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2019-01-23 312-900-0XXX 0000–0999Assigned FRACTEL, LLC 965H CHICGOZN01 IL
2019-01-22 312-488-0XXX 0000–0999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2019-01-22 312-584-1XXX 1000–1999Assigned ONVOY, LLC 224C CHICGOZN01 IL

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.