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
2006-10-10 312-492-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2006-09-26 312-239-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2006-09-26 312-239-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2006-09-26 312-239-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2006-09-15 312-912-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2006-08-16 312-714-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2006-07-19 312-714-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2006-07-19 312-714-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2006-07-19 312-714-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2006-07-19 312-714-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2006-07-19 312-714-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2006-07-14 312-265-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2006-07-14 312-265-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2006-06-28 312-447-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-06-28 312-447-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-06-28 312-447-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-06-28 312-447-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-06-28 312-447-7XXX 7000–7999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-06-20 312-676-0XXX 0000–0999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-06-20 312-676-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-06-20 312-676-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-06-20 312-676-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-06-20 312-676-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-06-20 312-676-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-06-20 312-676-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-06-20 312-676-7XXX 7000–7999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-06-20 312-676-8XXX 8000–8999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-06-20 312-676-9XXX 9000–9999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-06-19 312-380-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2006-06-15 312-823-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2006-06-15 312-823-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2006-06-06 312-957-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2006-06-06 312-957-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2006-06-06 312-957-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2006-06-06 312-957-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2006-06-06 312-957-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2006-05-23 312-651-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-05-11 312-823-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2006-05-11 312-823-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2006-05-11 312-823-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2006-05-08 312-506-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2006-04-28 312-291-7XXX 7000–7999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-04-25 312-265-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2006-04-25 312-265-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2006-04-25 312-265-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2006-04-25 312-265-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2006-04-25 312-265-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2006-04-24 312-506-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2006-03-29 312-568-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2006-03-08 312-212-0XXX 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.