NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/23/2026
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, all time — NPA 773
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2009-07-01 | 773-982-3XXX | 3000–3999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN10 | IL |
| 2008-05-19 | 773-674-0XXX | 0000–0999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL |
| 2008-05-19 | 773-674-1XXX | 1000–1999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL |
| 2008-05-19 | 773-674-2XXX | 2000–2999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL |
| 2008-05-19 | 773-674-3XXX | 3000–3999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL |
| 2008-05-19 | 773-674-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL |
| 2008-05-19 | 773-674-5XXX | 5000–5999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL |
| 2008-05-19 | 773-674-6XXX | 6000–6999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL |
| 2008-05-19 | 773-674-7XXX | 7000–7999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL |
| 2008-05-19 | 773-674-8XXX | 8000–8999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL |
| 2008-05-19 | 773-674-9XXX | 9000–9999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL |
| 2008-05-19 | 773-980-2XXX | 2000–2999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN10 | IL |
| 2006-05-22 | 773-801-2XXX | 2000–2999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL |
| 2006-03-23 | 773-990-1XXX | 1000–1999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL |
| 2006-03-23 | 773-990-2XXX | 2000–2999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL |
| 2006-03-23 | 773-990-3XXX | 3000–3999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL |
| 2006-03-23 | 773-990-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL |
| 2006-03-23 | 773-990-5XXX | 5000–5999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL |
| 2006-03-23 | 773-990-6XXX | 6000–6999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL |
| 2006-03-23 | 773-990-7XXX | 7000–7999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL |
| 2006-03-23 | 773-990-8XXX | 8000–8999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL |
| 2004-11-11 | 773-341-5XXX | 5000–5999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN10 | IL |
| 2002-02-27 | 773-269-2XXX | 2000–2999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL |
| 2002-01-30 | 773-770-7XXX | 7000–7999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL |
| 2001-07-19 | 773-328-7XXX | 7000–7999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL |
| 2001-04-19 | 773-289-3XXX | 3000–3999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL |
| 2001-04-19 | 773-289-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL |
| 2001-04-19 | 773-442-8XXX | 8000–8999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN02 | IL |
| 2001-01-02 | 773-948-5XXX | 5000–5999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN08 | IL |
| 2001-01-02 | 773-948-6XXX | 6000–6999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN08 | IL |
| 2000-07-24 | 773-967-6XXX | 6000–6999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL |
| 2000-06-22 | 773-967-1XXX | 1000–1999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL |
| 2000-06-22 | 773-967-2XXX | 2000–2999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL |
| 2000-06-22 | 773-967-3XXX | 3000–3999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL |
| 2000-06-20 | 773-697-2XXX | 2000–2999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL |
| 2000-06-20 | 773-697-6XXX | 6000–6999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN04 | IL |
| 2000-05-24 | 773-557-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN03 | IL |
| 2000-05-24 | 773-648-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN06 | IL |
| 2000-05-19 | 773-359-5XXX | 5000–5999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL |
| 2000-05-19 | 773-967-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL |
| 2000-05-19 | 773-967-5XXX | 5000–5999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN09 | IL |
| 2000-04-07 | 773-442-4XXX | 4000–4999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN02 | IL |
| 2000-04-07 | 773-442-5XXX | 5000–5999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN02 | IL |
| 2000-04-07 | 773-442-6XXX | 6000–6999 | Assigned | ILLINOIS BELL TEL CO | 9329 | CHICGOZN02 | IL |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.