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
2014-08-20 312-877-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-20 312-877-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-20 312-877-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-20 312-877-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-20 312-877-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2014-08-19 312-877-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
2014-08-19 312-877-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
2014-08-19 312-877-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
2014-08-19 312-877-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHICGOZN01 IL
2014-08-13 312-877-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C CHICGOZN01 IL
2014-08-13 312-998-4XXX 4000–4999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J CHICGOZN01 IL
2014-08-12 312-995-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2014-08-12 312-995-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2014-08-12 312-995-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2014-08-12 312-995-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2014-08-08 312-967-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-08 312-967-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-08 312-967-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-08 312-967-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-08 312-967-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-08 312-967-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-08 312-967-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-08 312-967-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-08 312-967-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-08 312-967-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-04 312-248-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-04 312-248-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-04 312-248-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-04 312-248-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-04 312-248-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-04 312-690-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2014-08-04 312-690-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-04 312-690-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-04 312-763-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-08-04 312-763-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2014-07-02 312-248-5XXX 5000–5999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2014-06-27 312-690-0XXX 0000–0999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2014-06-27 312-690-1XXX 1000–1999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2014-06-27 312-763-0XXX 0000–0999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2014-06-27 312-763-1XXX 1000–1999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2014-06-27 312-962-9XXX 9000–9999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2014-06-18 312-690-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2014-06-18 312-690-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2014-06-18 312-690-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2014-06-17 312-763-7XXX 7000–7999Assigned LEVEL 3 TELECOM OF ILLINOIS, LLC - IL 138G CHICGOZN01 IL
2014-06-16 312-763-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2014-06-13 312-763-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2014-06-13 312-763-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2014-05-22 312-635-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2014-05-14 312-763-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J 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.