NumberResearchRecent thousands-block assignments
1 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
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
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
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2009-01-16 | 312-298-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2009-01-02 | 312-256-8XXX | 8000–8999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | CHICGOZN01 | IL |
| 2008-12-16 | 312-444-8XXX | 8000–8999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | CHICGOZN01 | IL |
| 2008-12-16 | 312-970-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2008-12-16 | 312-970-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2008-12-02 | 312-765-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2008-12-02 | 312-765-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2008-11-07 | 312-594-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2008-11-07 | 312-594-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2008-11-07 | 312-594-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2008-11-07 | 312-594-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2008-11-07 | 312-594-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2008-11-07 | 312-594-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2008-11-07 | 312-594-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2008-11-07 | 312-594-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2008-11-07 | 312-594-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2008-11-07 | 312-594-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2008-10-23 | 312-929-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | CHICGOZN01 | IL |
| 2008-10-15 | 312-880-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2008-10-10 | 312-283-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2008-10-09 | 312-725-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | CHICGOZN01 | IL |
| 2008-10-07 | 312-428-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL |
| 2008-10-07 | 312-428-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL |
| 2008-10-07 | 312-428-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL |
| 2008-10-07 | 312-450-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL |
| 2008-10-07 | 312-450-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL |
| 2008-10-07 | 312-566-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL |
| 2008-10-07 | 312-566-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL |
| 2008-10-07 | 312-770-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL |
| 2008-10-07 | 312-788-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL |
| 2008-10-07 | 312-788-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL |
| 2008-10-07 | 312-869-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL |
| 2008-10-07 | 312-869-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | CHICGOZN01 | IL |
| 2008-10-03 | 312-547-2XXX | 2000–2999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2008-10-03 | 312-547-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2008-10-03 | 312-547-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2008-10-03 | 312-547-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2008-10-03 | 312-547-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2008-10-03 | 312-547-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2008-10-03 | 312-547-8XXX | 8000–8999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2008-10-02 | 312-204-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2008-10-02 | 312-204-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2008-10-02 | 312-204-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2008-10-02 | 312-254-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2008-09-25 | 312-534-0XXX | 0000–0999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL |
| 2008-09-25 | 312-534-1XXX | 1000–1999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL |
| 2008-09-25 | 312-534-2XXX | 2000–2999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL |
| 2008-09-25 | 312-534-3XXX | 3000–3999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL |
| 2008-09-25 | 312-534-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL |
| 2008-09-25 | 312-534-5XXX | 5000–5999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.