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 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
2005-07-08 773-746-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-07-08 773-746-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-07-08 773-746-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-07-08 773-746-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-07-08 773-746-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-07-08 773-746-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-07-08 773-746-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-07-08 773-746-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-07-08 773-746-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-07-08 773-746-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-07-01 773-371-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN07 IL
2005-07-01 773-371-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN07 IL
2005-07-01 773-751-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN02 IL
2005-07-01 773-751-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN02 IL
2005-07-01 773-751-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN02 IL
2005-06-28 773-494-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-06-23 773-260-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2005-06-23 773-546-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2005-06-23 773-600-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2005-06-23 773-987-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2005-06-23 773-987-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2005-06-23 773-987-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2005-06-23 773-987-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2005-06-22 773-444-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-06-22 773-444-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-06-22 773-992-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-06-16 773-570-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN11 IL
2005-06-16 773-570-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN11 IL
2005-06-16 773-570-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN11 IL
2005-06-14 773-253-2XXX 2000–2999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN10 IL
2005-06-13 773-634-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J CHICGOZN04 IL
2005-06-13 773-992-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-06-13 773-992-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-06-10 773-290-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2005-06-10 773-319-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2005-06-10 773-649-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN02 IL
2005-06-10 773-649-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN02 IL
2005-06-10 773-649-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN02 IL
2005-06-10 773-649-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN02 IL
2005-06-10 773-649-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN02 IL
2005-06-09 773-444-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2005-06-08 773-269-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN04 IL
2005-06-08 773-816-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2005-06-08 773-816-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2005-06-08 773-987-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2005-06-08 773-987-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2005-06-08 773-987-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2005-06-08 773-987-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2005-06-01 773-299-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2005-06-01 773-499-7XXX 7000–7999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN03 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.