NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 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, all time — NPA 773
RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 18
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
2009-01-09 773-980-1XXX 1000–1999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN10 IL
2007-07-16 773-789-2XXX 2000–2999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN08 IL
2007-07-12 773-937-4XXX 4000–4999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN08 IL
2007-07-10 773-952-2XXX 2000–2999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 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
2005-10-12 773-729-4XXX 4000–4999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN07 IL
2005-09-29 773-253-9XXX 9000–9999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN10 IL
2005-08-29 773-336-5XXX 5000–5999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN09 IL
2005-06-14 773-253-2XXX 2000–2999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN10 IL
2004-08-04 773-322-4XXX 4000–4999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN07 IL
2004-08-04 773-336-4XXX 4000–4999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN09 IL
2004-08-04 773-341-4XXX 4000–4999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN10 IL
2004-08-04 773-912-4XXX 4000–4999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN08 IL
2000-09-28 773-358-5XXX 5000–5999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN07 IL
2000-09-28 773-739-9XXX 9000–9999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN02 IL
2000-09-28 773-770-9XXX 9000–9999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN04 IL
2000-09-27 773-648-6XXX 6000–6999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN06 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.