NumberResearchRecent thousands-block assignments
1 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026
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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2000-05-26 | 312-884-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHICGOZN01 | IL |
| 2000-05-19 | 312-985-2XXX | 2000–2999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL |
| 2000-05-19 | 312-985-3XXX | 3000–3999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL |
| 2000-05-19 | 312-985-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL |
| 2000-05-16 | 312-881-2XXX | 2000–2999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2000-05-16 | 312-881-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | CHICGOZN01 | IL |
| 2000-04-21 | 312-981-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL |
| 2000-04-21 | 312-981-6XXX | 6000–6999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL |
| 2000-03-29 | 312-985-8XXX | 8000–8999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL |
| 2000-03-09 | 312-884-3XXX | 3000–3999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | CHICGOZN01 | IL |
| 2000-03-09 | 312-884-4XXX | 4000–4999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | CHICGOZN01 | IL |
| 2000-03-08 | 312-863-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2000-03-05 | 312-379-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL |
| 2000-03-05 | 312-379-6XXX | 6000–6999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL |
| 2000-03-05 | 312-379-7XXX | 7000–7999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN01 | IL |
| 2000-02-15 | 312-863-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2000-02-15 | 312-863-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2000-02-15 | 312-863-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2000-02-15 | 312-863-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2000-02-15 | 312-863-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHICGOZN01 | IL |
| 2000-01-05 | 312-229-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2000-01-05 | 312-229-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2000-01-05 | 312-229-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2000-01-05 | 312-229-6XXX | 6000–6999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 2000-01-05 | 312-229-7XXX | 7000–7999 | Assigned | PAETEC ITEL, LLC | 829J | CHICGOZN01 | IL |
| 1999-11-15 | 312-528-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 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.