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
2015-06-30 312-471-1XXX 1000–1999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2015-06-30 312-471-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2015-06-30 312-471-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2015-06-30 312-471-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2015-06-30 312-471-9XXX 9000–9999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2015-06-30 312-536-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-06-30 312-536-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-06-30 312-536-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-06-30 312-536-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-06-30 312-536-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-06-30 312-536-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-06-30 312-536-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-06-30 312-536-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-06-30 312-536-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-06-30 312-536-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-06-26 312-889-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2015-06-26 312-889-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2015-06-26 312-989-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-26 312-989-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-26 312-989-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-26 312-989-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-26 312-989-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-26 312-989-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-17 312-722-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-17 312-722-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-17 312-722-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-17 312-722-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-17 312-722-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-17 312-722-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-17 312-722-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-17 312-722-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-17 312-778-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-09 312-874-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-09 312-874-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-09 312-874-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-09 312-874-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-09 312-874-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2015-06-08 312-722-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2015-06-08 312-722-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2015-05-29 312-874-5XXX 5000–5999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2015-05-29 312-874-6XXX 6000–6999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2015-05-29 312-874-7XXX 7000–7999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2015-05-27 312-874-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-05-27 312-874-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2015-05-26 312-778-4XXX 4000–4999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2015-05-26 312-778-9XXX 9000–9999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2015-05-26 312-937-6XXX 6000–6999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2015-05-26 312-937-7XXX 7000–7999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2015-05-26 312-937-8XXX 8000–8999Assigned METROPCS, INC. 5562 CHICGOZN01 IL
2015-05-19 312-778-1XXX 1000–1999Assigned METROPCS, INC. 5562 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.