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
2010-12-03 773-377-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN11 IL
2010-12-03 773-554-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2010-12-03 773-556-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2010-12-03 773-557-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2010-12-03 773-770-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN04 IL
2010-12-03 773-850-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2010-12-03 773-850-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2010-12-03 773-850-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2010-12-03 773-977-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN02 IL
2010-12-03 773-977-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN02 IL
2010-11-08 773-234-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN06 IL
2010-11-03 773-242-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN06 IL
2010-11-03 773-245-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN08 IL
2010-11-03 773-328-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN04 IL
2010-11-03 773-524-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN04 IL
2010-11-02 773-796-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN02 IL
2010-11-02 773-796-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN02 IL
2010-11-01 773-270-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN04 IL
2010-11-01 773-901-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN10 IL
2010-10-27 773-672-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN10 IL
2010-10-27 773-966-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN07 IL
2010-10-21 773-943-3XXX 3000–3999Assigned ONVOY, LLC 224C CHICGOZN02 IL
2010-10-21 773-943-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN02 IL
2010-10-21 773-943-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN02 IL
2010-10-15 773-245-7XXX 7000–7999Assigned ONVOY, LLC 224C CHICGOZN08 IL
2010-10-15 773-765-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN02 IL
2010-10-15 773-850-8XXX 8000–8999Assigned ONVOY, LLC 224C CHICGOZN03 IL
2010-10-05 773-999-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN05 IL
2010-09-29 773-219-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2010-09-29 773-219-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2010-09-29 773-219-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2010-09-29 773-683-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN03 IL
2010-09-29 773-916-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2010-09-24 773-245-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN08 IL
2010-09-16 773-245-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN08 IL
2010-09-07 773-943-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2010-09-07 773-943-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2010-09-07 773-943-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2010-09-07 773-943-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 IL
2010-09-03 773-672-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN10 IL
2010-09-01 773-916-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2010-09-01 773-916-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2010-08-26 773-328-1XXX 1000–1999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN04 IL
2010-08-26 773-940-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN06 IL
2010-08-24 773-798-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2010-08-24 773-798-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN07 IL
2010-08-20 773-280-9XXX 9000–9999Assigned ONVOY, LLC 224C CHICGOZN06 IL
2010-08-19 773-888-6XXX 6000–6999Assigned ONVOY, LLC 224C CHICGOZN04 IL
2010-08-19 773-888-7XXX 7000–7999Assigned ONVOY, LLC 224C CHICGOZN04 IL
2010-08-18 773-961-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN02 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.