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
2012-04-05 312-509-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2012-04-04 312-448-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHICGOZN01 IL
2012-04-03 312-448-5XXX 5000–5999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2012-04-02 312-216-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2012-03-30 312-216-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2012-03-30 312-216-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2012-03-30 312-216-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2012-03-22 312-508-3XXX 3000–3999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2012-03-22 312-508-4XXX 4000–4999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2012-03-09 312-509-4XXX 4000–4999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2012-03-02 312-216-2XXX 2000–2999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2012-03-01 312-888-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2012-03-01 312-888-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2012-03-01 312-888-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2012-03-01 312-888-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2012-02-16 312-216-1XXX 1000–1999Assigned FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2012-02-10 312-888-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2012-02-10 312-888-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CHICGOZN01 IL
2012-02-01 312-300-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2012-02-01 312-300-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2012-02-01 312-300-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2012-02-01 312-300-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN01 IL
2012-01-05 312-300-2XXX 2000–2999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2012-01-05 312-300-3XXX 3000–3999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2011-12-29 312-300-1XXX 1000–1999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2011-12-29 312-300-8XXX 8000–8999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2011-12-29 312-300-9XXX 9000–9999Assigned ONVOY, LLC 224C CHICGOZN01 IL
2011-12-14 312-448-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2011-12-14 312-448-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2011-12-14 312-448-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2011-12-14 312-879-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2011-12-02 312-202-3XXX 3000–3999Assigned ACCESS ONE, INC. - IL 5447 CHICGOZN01 IL
2011-11-30 312-683-9XXX 9000–9999Assigned PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CHICGOZN01 IL
2011-11-18 312-340-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2011-11-18 312-340-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2011-11-18 312-340-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2011-11-18 312-340-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICGOZN01 IL
2011-11-15 312-273-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2011-11-15 312-292-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2011-11-11 312-340-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2011-11-11 312-340-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 CHICGOZN01 IL
2011-11-11 312-340-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2011-11-03 312-340-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J CHICGOZN01 IL
2011-11-01 312-292-2XXX 2000–2999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2011-11-01 312-292-3XXX 3000–3999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2011-11-01 312-292-4XXX 4000–4999Assigned ILLINOIS BELL TEL CO 9329 CHICGOZN01 IL
2011-10-10 312-273-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2011-10-10 312-273-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2011-10-10 312-292-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CHICGOZN01 IL
2011-10-10 312-292-7XXX 7000–7999Assigned 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.