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
2008-06-05 312-348-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 CHICGOZN01 IL
2008-06-05 312-348-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 CHICGOZN01 IL
2008-06-05 312-348-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 CHICGOZN01 IL
2008-05-30 312-651-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2008-05-30 312-651-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2008-05-30 312-878-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2008-05-30 312-878-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2008-05-30 312-878-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2008-05-30 312-878-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2008-05-27 312-229-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2008-05-19 312-789-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2008-05-09 312-526-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2008-05-05 312-589-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2008-05-05 312-589-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2008-05-02 312-445-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2008-05-01 312-445-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2008-05-01 312-445-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2008-04-08 312-369-1XXX 1000–1999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2008-04-08 312-369-2XXX 2000–2999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2008-04-08 312-369-3XXX 3000–3999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2008-04-08 312-369-4XXX 4000–4999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2008-04-08 312-369-5XXX 5000–5999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2008-04-08 312-369-6XXX 6000–6999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2008-04-08 312-369-7XXX 7000–7999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2008-04-08 312-369-8XXX 8000–8999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2008-04-01 312-235-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2008-04-01 312-878-0XXX 0000–0999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2008-04-01 312-878-9XXX 9000–9999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2008-03-19 312-775-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2008-03-18 312-447-8XXX 8000–8999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2008-03-18 312-506-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2008-03-11 312-445-4XXX 4000–4999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2008-03-11 312-445-5XXX 5000–5999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2008-03-03 312-234-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2008-02-21 312-445-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2008-02-21 312-445-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2008-02-11 312-532-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2008-02-11 312-532-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2008-02-06 312-626-2XXX 2000–2999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2008-02-06 312-878-3XXX 3000–3999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2008-02-06 312-878-4XXX 4000–4999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2008-02-06 312-878-5XXX 5000–5999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2008-02-06 312-878-6XXX 6000–6999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2008-01-28 312-929-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2008-01-28 312-929-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2008-01-24 312-646-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2008-01-24 312-646-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2007-11-20 312-462-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2007-11-15 312-572-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2007-10-29 312-985-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 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.