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
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
2004-08-04 773-600-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-08-04 773-600-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-08-04 773-600-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-08-04 773-600-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-08-04 773-600-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-08-04 773-912-4XXX 4000–4999Assigned RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 8702 CHICGOZN08 IL
2004-08-03 773-649-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN02 IL
2004-07-27 773-290-1XXX 1000–1999Assigned ONVOY, LLC 224C CHICGOZN02 IL
2004-07-27 773-299-1XXX 1000–1999Assigned ONVOY, LLC 224C CHICGOZN06 IL
2004-07-27 773-309-6XXX 6000–6999Assigned ONVOY, LLC 224C CHICGOZN05 IL
2004-07-27 773-322-1XXX 1000–1999Assigned ONVOY, LLC 224C CHICGOZN07 IL
2004-07-27 773-341-2XXX 2000–2999Assigned ONVOY, LLC 224C CHICGOZN10 IL
2004-07-27 773-362-2XXX 2000–2999Assigned ONVOY, LLC 224C CHICGOZN08 IL
2004-07-27 773-364-1XXX 1000–1999Assigned ONVOY, LLC 224C CHICGOZN09 IL
2004-07-27 773-537-4XXX 4000–4999Assigned ONVOY, LLC 224C CHICGOZN04 IL
2004-07-27 773-557-7XXX 7000–7999Assigned ONVOY, LLC 224C CHICGOZN03 IL
2004-07-23 773-829-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2004-07-20 773-600-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-07-20 773-600-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-07-20 773-600-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-07-20 773-600-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-07-09 773-289-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2004-07-09 773-321-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J CHICGOZN06 IL
2004-07-09 773-321-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J CHICGOZN06 IL
2004-07-09 773-321-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J CHICGOZN06 IL
2004-07-09 773-321-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J CHICGOZN06 IL
2004-07-09 773-321-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J CHICGOZN06 IL
2004-07-09 773-733-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2004-07-09 773-733-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2004-07-09 773-733-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2004-07-07 773-413-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN05 IL
2004-07-07 773-432-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN08 IL
2004-07-01 773-433-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN02 IL
2004-06-25 773-756-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN03 IL
2004-06-23 773-573-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL
2004-06-23 773-573-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL
2004-06-23 773-573-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL
2004-06-23 773-726-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL
2004-06-23 773-726-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL
2004-06-23 773-726-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL
2004-06-23 773-726-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL
2004-06-23 773-726-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN07 IL
2004-06-23 773-799-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN04 IL
2004-06-22 773-308-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN03 IL
2004-06-22 773-308-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN03 IL
2004-06-22 773-308-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN03 IL
2004-06-22 773-308-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN03 IL
2004-06-22 773-332-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN03 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.