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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2007-07-12 773-691-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2007-07-12 773-937-4XXX 4000–4999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN08 IL
2007-07-12 773-971-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2007-07-12 773-971-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2007-07-12 773-971-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2007-07-12 773-971-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2007-07-12 773-971-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2007-07-12 773-971-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2007-07-11 773-877-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-07-11 773-877-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-07-11 773-877-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-07-11 773-877-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-07-11 773-877-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-07-11 773-877-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-07-11 773-877-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-07-10 773-823-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN06 IL
2007-07-10 773-952-2XXX 2000–2999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN07 IL
2007-07-06 773-952-5XXX 5000–5999Assigned AT&T - LOCAL 7421 CHICGOZN07 IL
2007-07-05 773-253-7XXX 7000–7999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN10 IL
2007-07-05 773-359-6XXX 6000–6999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN09 IL
2007-07-02 773-749-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-07-02 773-749-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-07-02 773-749-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-07-02 773-749-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-07-02 773-749-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-06-28 773-432-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2007-06-28 773-526-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2007-06-28 773-788-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2007-06-28 773-788-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2007-06-28 773-939-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2007-06-28 773-939-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN08 IL
2007-06-27 773-565-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2007-06-27 773-629-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2007-06-26 773-749-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-06-26 773-749-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-06-26 773-749-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-06-26 773-749-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-06-26 773-749-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-06-25 773-629-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2007-06-25 773-629-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2007-06-25 773-629-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2007-06-21 773-952-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2007-06-21 773-952-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2007-06-21 773-952-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2007-06-20 773-698-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2007-06-20 773-698-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2007-06-20 773-698-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2007-06-19 773-595-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2007-06-18 773-790-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2007-06-18 773-790-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 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.