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
2015-12-22 312-858-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2015-12-22 312-858-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2015-12-22 312-858-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2015-12-22 312-858-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2015-12-18 312-964-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-12-18 312-964-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-12-18 312-964-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-12-07 312-868-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2015-12-01 312-549-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2015-12-01 312-549-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2015-11-25 312-549-0XXX 0000–0999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2015-11-25 312-549-1XXX 1000–1999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2015-11-25 312-549-2XXX 2000–2999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2015-11-19 312-934-0XXX 0000–0999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2015-11-11 312-734-0XXX 0000–0999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2015-11-11 312-734-9XXX 9000–9999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2015-11-11 312-837-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-11-11 312-871-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-11-11 312-934-1XXX 1000–1999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2015-11-10 312-734-1XXX 1000–1999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2015-10-23 312-837-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2015-10-23 312-837-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2015-10-14 312-517-1XXX 1000–1999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2015-10-02 312-837-5XXX 5000–5999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2015-10-02 312-837-6XXX 6000–6999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2015-10-02 312-837-7XXX 7000–7999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2015-10-02 312-837-8XXX 8000–8999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2015-09-28 312-549-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2015-09-28 312-549-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2015-09-28 312-549-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2015-09-28 312-549-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2015-09-28 312-549-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2015-09-23 312-885-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-09-23 312-885-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-09-23 312-885-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-09-23 312-885-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-09-23 312-885-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-09-23 312-885-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-09-23 312-885-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-09-23 312-885-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-09-23 312-885-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-09-23 312-885-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-09-21 312-734-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2015-09-21 312-734-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2015-09-21 312-734-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2015-09-21 312-734-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2015-09-21 312-734-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2015-09-21 312-734-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2015-09-21 312-734-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2015-09-17 312-837-0XXX 0000–0999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E 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.