NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 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 773
ONVOY, 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
2006-03-28 773-225-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2006-03-28 773-225-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2006-03-28 773-360-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN04 IL
2006-03-28 773-696-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2006-03-23 773-574-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2006-03-23 773-574-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2006-03-23 773-574-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2006-03-23 773-574-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2006-03-23 773-574-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2006-03-23 773-876-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2006-03-23 773-876-1XXX 1000–1999Assigned METROPCS, INC. 5562 CHICGOZN03 IL
2006-03-23 773-876-2XXX 2000–2999Assigned METROPCS, INC. 5562 CHICGOZN03 IL
2006-03-23 773-876-3XXX 3000–3999Assigned METROPCS, INC. 5562 CHICGOZN03 IL
2006-03-23 773-876-4XXX 4000–4999Assigned METROPCS, INC. 5562 CHICGOZN03 IL
2006-03-23 773-876-5XXX 5000–5999Assigned METROPCS, INC. 5562 CHICGOZN03 IL
2006-03-23 773-876-6XXX 6000–6999Assigned METROPCS, INC. 5562 CHICGOZN03 IL
2006-03-23 773-876-7XXX 7000–7999Assigned METROPCS, INC. 5562 CHICGOZN03 IL
2006-03-23 773-876-8XXX 8000–8999Assigned METROPCS, INC. 5562 CHICGOZN03 IL
2006-03-23 773-876-9XXX 9000–9999Assigned METROPCS, INC. 5562 CHICGOZN03 IL
2006-03-23 773-990-1XXX 1000–1999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
2006-03-23 773-990-2XXX 2000–2999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
2006-03-23 773-990-3XXX 3000–3999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
2006-03-23 773-990-4XXX 4000–4999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
2006-03-23 773-990-5XXX 5000–5999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
2006-03-23 773-990-6XXX 6000–6999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
2006-03-23 773-990-7XXX 7000–7999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
2006-03-23 773-990-8XXX 8000–8999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN03 IL
2006-03-21 773-225-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2006-03-21 773-225-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2006-03-21 773-899-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN03 IL
2006-03-21 773-899-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN03 IL
2006-03-21 773-899-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN03 IL
2006-03-21 773-899-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN03 IL
2006-03-20 773-553-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2006-03-15 773-273-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN02 IL
2006-03-15 773-362-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN08 IL
2006-03-14 773-701-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2006-03-14 773-942-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2006-03-08 773-362-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN08 IL
2006-03-02 773-309-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN05 IL
2006-03-02 773-360-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN04 IL
2006-02-23 773-295-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN05 IL
2006-02-23 773-295-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN05 IL
2006-02-17 773-299-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2006-02-17 773-867-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2006-02-13 773-724-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2006-02-13 773-864-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2006-02-08 773-241-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL
2006-02-08 773-241-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL
2006-02-08 773-241-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL

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.