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
2001-06-12 312-242-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2001-06-12 312-242-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2001-06-12 312-242-8XXX 8000–8999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2001-06-12 312-242-9XXX 9000–9999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2001-06-07 312-994-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2001-05-24 312-298-2XXX 2000–2999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2001-05-24 312-298-3XXX 3000–3999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2001-05-24 312-298-4XXX 4000–4999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2001-05-24 312-298-5XXX 5000–5999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2001-05-24 312-298-6XXX 6000–6999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2001-05-24 312-298-7XXX 7000–7999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2001-05-24 312-298-8XXX 8000–8999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2001-05-21 312-846-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2001-05-21 312-846-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2001-05-21 312-846-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2001-05-21 312-846-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2001-05-21 312-846-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2001-05-21 312-846-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2001-05-21 312-846-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2001-04-19 312-970-7XXX 7000–7999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2001-02-07 312-528-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2001-01-04 312-884-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2001-01-04 312-948-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2001-01-04 312-981-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2001-01-03 312-242-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2000-11-15 312-242-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2000-09-29 312-242-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2000-09-29 312-870-8XXX 8000–8999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2000-09-28 312-799-8XXX 8000–8999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2000-09-27 312-884-6XXX 6000–6999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2000-09-15 312-612-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2000-09-15 312-612-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2000-09-08 312-612-6XXX 6000–6999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2000-09-08 312-612-7XXX 7000–7999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2000-09-08 312-612-8XXX 8000–8999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2000-08-16 312-528-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2000-08-16 312-799-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2000-08-15 312-476-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2000-08-15 312-476-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2000-08-04 312-884-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2000-08-03 312-994-7XXX 7000–7999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2000-08-02 312-268-3XXX 3000–3999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2000-08-02 312-278-6XXX 6000–6999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2000-08-02 312-278-8XXX 8000–8999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2000-07-05 312-881-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2000-07-05 312-881-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2000-06-27 312-281-3XXX 3000–3999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2000-06-19 312-932-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2000-06-13 312-994-9XXX 9000–9999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2000-05-31 312-799-6XXX 6000–6999Assigned ILLINOIS BELL TEL CO 9329 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.