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 312
BANDWIDTH.COM CLEC, LLC - 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
2014-09-10 312-483-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-09-10 312-995-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2014-09-10 312-998-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-09-10 312-998-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-09-10 312-998-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-09-10 312-998-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-09-10 312-998-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-09-10 312-998-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-09-10 312-998-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-09-10 312-998-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-09-10 312-998-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-26 312-483-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2014-08-26 312-483-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2014-08-25 312-483-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-483-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-483-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-483-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-483-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-483-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-483-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-522-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-522-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-522-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-522-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-522-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-522-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-522-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-522-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-522-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-522-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-866-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-866-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-866-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-866-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-866-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-866-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-866-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-866-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-866-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-25 312-866-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-20 312-785-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2014-08-20 312-785-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2014-08-20 312-785-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2014-08-20 312-785-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2014-08-20 312-785-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2014-08-20 312-785-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2014-08-20 312-785-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2014-08-20 312-785-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2014-08-20 312-785-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2014-08-20 312-785-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 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.