NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

2 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 815
VERSATEL LLC 1
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 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
2004-06-10 815-858-5XXX 5000–5999Assigned UNITED STATES CELLULAR - IL 6265 ELIZABETH IL
2004-06-08 815-918-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CLIFTON IL
2004-06-03 815-239-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PECATONICA IL
2004-06-03 815-362-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 GERMAN VLY IL
2004-06-03 815-539-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 MENDOTA IL
2004-06-03 815-745-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 WARREN IL
2004-05-21 815-698-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K ASHKUM IL
2004-05-13 815-826-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 SOMONAUK IL
2004-05-11 815-280-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 JOLIET IL
2004-05-10 815-276-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CRYSTAL LK IL
2004-05-09 815-566-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BELVIDERE IL
2004-04-30 815-214-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 KANKAKEE IL
2004-04-30 815-215-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 NEW LENOX IL
2004-04-30 815-221-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 LOCKPORT IL
2004-04-30 815-308-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 WOODSTOCK IL
2004-04-30 815-313-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 OTTAWA IL
2004-04-30 815-318-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 MORRIS IL
2004-04-30 815-410-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 LA SALLE IL
2004-04-30 815-521-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 MINOOKA IL
2004-04-28 815-608-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 ROCKFORD IL
2004-04-15 815-388-2XXX 2000–2999Assigned METROPCS, INC. 5562 MCHENRY IL
2004-04-15 815-388-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 MCHENRY IL
2004-03-25 815-403-8XXX 8000–8999Assigned METROPCS, INC. 5562 MCHENRY IL
2004-03-12 815-267-3XXX 3000–3999Assigned ILLINOIS BELL TEL CO 9329 PLAINFIELD IL
2004-03-09 815-272-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 JOLIET IL
2004-03-09 815-590-4XXX 4000–4999Assigned UNITED STATES CELLULAR - IL 6265 STERLING IL
2004-03-09 815-590-5XXX 5000–5999Assigned UNITED STATES CELLULAR - IL 6265 STERLING IL
2004-03-09 815-590-6XXX 6000–6999Assigned UNITED STATES CELLULAR - IL 6265 STERLING IL
2004-03-09 815-590-7XXX 7000–7999Assigned UNITED STATES CELLULAR - IL 6265 STERLING IL
2004-03-09 815-590-8XXX 8000–8999Assigned UNITED STATES CELLULAR - IL 6265 STERLING IL
2004-03-09 815-600-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 JOLIET IL
2004-03-09 815-600-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 JOLIET IL
2004-03-09 815-651-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 JOLIET IL
2004-03-09 815-651-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 JOLIET IL
2004-03-09 815-651-5XXX 5000–5999Assigned METROPCS, INC. 5562 JOLIET IL
2004-03-09 815-651-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 JOLIET IL
2004-03-09 815-999-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 JOLIET IL
2004-03-09 815-999-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 JOLIET IL
2004-03-09 815-999-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 JOLIET IL
2004-03-07 815-601-1XXX 1000–1999Assigned UNITED STATES CELLULAR - IL 6265 ROCKFORD IL
2004-03-07 815-601-2XXX 2000–2999Assigned UNITED STATES CELLULAR - IL 6265 ROCKFORD IL
2004-03-07 815-601-3XXX 3000–3999Assigned UNITED STATES CELLULAR - IL 6265 ROCKFORD IL
2004-03-07 815-601-4XXX 4000–4999Assigned UNITED STATES CELLULAR - IL 6265 ROCKFORD IL
2004-03-07 815-601-5XXX 5000–5999Assigned UNITED STATES CELLULAR - IL 6265 ROCKFORD IL
2004-03-07 815-601-6XXX 6000–6999Assigned UNITED STATES CELLULAR - IL 6265 ROCKFORD IL
2004-03-07 815-601-7XXX 7000–7999Assigned UNITED STATES CELLULAR - IL 6265 ROCKFORD IL
2004-03-07 815-601-8XXX 8000–8999Assigned UNITED STATES CELLULAR - IL 6265 ROCKFORD IL
2004-03-07 815-601-9XXX 9000–9999Assigned UNITED STATES CELLULAR - IL 6265 ROCKFORD IL
2004-02-25 815-272-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 JOLIET IL
2004-02-25 815-644-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CRESCENTCY 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.