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
2017-03-07 312-270-8XXX 8000–8999Assigned TELNYX LLC 073H CHICGOZN01 IL
2017-02-17 312-270-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2017-02-10 312-517-2XXX 2000–2999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2017-01-31 312-270-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2017-01-19 312-270-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2017-01-19 312-270-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2017-01-16 312-270-9XXX 9000–9999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2017-01-12 312-569-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2017-01-12 312-572-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2017-01-12 312-599-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2017-01-12 312-599-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-30 312-686-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-30 312-686-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-30 312-686-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-30 312-686-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-30 312-686-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-30 312-686-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-30 312-686-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-30 312-686-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-30 312-686-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-30 312-970-6XXX 6000–6999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2016-12-14 312-686-1XXX 1000–1999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2016-12-13 312-599-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-13 312-599-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-13 312-599-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-13 312-599-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-13 312-599-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-13 312-632-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-13 312-632-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-13 312-632-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-13 312-632-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2016-12-13 312-970-4XXX 4000–4999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2016-12-09 312-469-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2016-12-08 312-632-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2016-12-08 312-632-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2016-11-30 312-439-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-11-30 312-439-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-11-30 312-439-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-11-30 312-439-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-11-30 312-439-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-11-30 312-439-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-11-30 312-439-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-11-30 312-439-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-11-30 312-439-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-11-30 312-439-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-11-30 312-723-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-11-30 312-723-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-11-30 312-723-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-11-30 312-723-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2016-11-30 312-723-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 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.