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
2004-08-18 312-479-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2004-08-18 312-479-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2004-08-18 312-479-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2004-08-18 312-479-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2004-07-09 312-730-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2004-07-09 312-730-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2004-07-09 312-730-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2004-07-09 312-730-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2004-07-09 312-730-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2004-06-11 312-376-0XXX 0000–0999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2004-06-11 312-376-1XXX 1000–1999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2004-06-11 312-376-2XXX 2000–2999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2004-06-11 312-376-3XXX 3000–3999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2004-06-11 312-376-4XXX 4000–4999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2004-06-08 312-363-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2004-06-08 312-363-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2004-06-08 312-363-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2004-06-08 312-624-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2004-06-08 312-624-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2004-06-08 312-731-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2004-06-08 312-731-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2004-05-24 312-506-0XXX 0000–0999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-05-24 312-506-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-05-24 312-506-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-05-24 312-506-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-05-24 312-506-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-05-24 312-506-9XXX 9000–9999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-05-11 312-363-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-05-11 312-428-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2004-04-26 312-486-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2004-04-26 312-486-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2004-04-26 312-486-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2004-04-26 312-486-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2004-04-26 312-486-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2004-04-26 312-486-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2004-04-26 312-486-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2004-04-26 312-486-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2004-04-26 312-486-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2004-04-26 312-486-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2004-04-07 312-247-0XXX 0000–0999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-04-07 312-247-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-04-07 312-247-2XXX 2000–2999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-04-07 312-247-3XXX 3000–3999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-04-07 312-247-4XXX 4000–4999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-04-07 312-247-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-04-07 312-247-6XXX 6000–6999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-04-07 312-247-7XXX 7000–7999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-04-07 312-247-8XXX 8000–8999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-04-07 312-247-9XXX 9000–9999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-03-05 312-525-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 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.