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
2016-09-15 312-684-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-09-15 312-684-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-09-15 312-684-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-09-15 312-684-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-09-15 312-687-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-09-15 312-687-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-09-15 312-687-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-09-15 312-687-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-09-15 312-687-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-09-15 312-687-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-09-15 312-687-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-09-15 312-687-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-09-15 312-687-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-09-15 312-687-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-09-02 312-414-4XXX 4000–4999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2016-09-02 312-414-5XXX 5000–5999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2016-09-02 312-414-6XXX 6000–6999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2016-09-02 312-414-7XXX 7000–7999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2016-09-02 312-414-8XXX 8000–8999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2016-08-23 312-414-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2016-08-19 312-796-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2016-08-15 312-414-0XXX 0000–0999Assigned VONAGE AMERICA LLC 197D CHICGOZN01 IL
2016-08-11 312-783-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-08-11 312-783-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-08-11 312-783-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-08-11 312-783-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-08-11 312-783-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-08-11 312-783-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-08-11 312-783-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-08-11 312-783-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-08-11 312-783-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-08-11 312-783-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-08-09 312-796-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2016-08-09 312-796-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2016-08-09 312-796-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2016-08-09 312-796-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2016-08-09 312-796-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2016-08-03 312-796-2XXX 2000–2999Assigned LEVEL 3 TELECOM OF ILLINOIS, LLC - IL 138G CHICGOZN01 IL
2016-07-27 312-796-0XXX 0000–0999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2016-07-08 312-824-1XXX 1000–1999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2016-07-08 312-824-5XXX 5000–5999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2016-07-08 312-824-7XXX 7000–7999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2016-07-08 312-824-8XXX 8000–8999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2016-07-08 312-824-9XXX 9000–9999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2016-07-05 312-824-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2016-06-24 312-824-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2016-06-22 312-517-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2016-06-22 312-586-0XXX 0000–0999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2016-06-22 312-586-5XXX 5000–5999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2016-06-22 312-586-6XXX 6000–6999Assigned METROPCS, INC. 5562 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.