NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2012-12-06 | 773-614-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHICGOZN10 | IL |
| 2011-08-08 | 773-688-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHICGOZN05 | IL |
| 2011-07-01 | 773-666-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHICGOZN04 | IL |
| 2006-06-14 | 773-912-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHICGOZN08 | IL |
| 2006-06-14 | 773-966-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHICGOZN07 | IL |
| 2006-06-07 | 773-565-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHICGOZN06 | IL |
| 2006-06-07 | 773-654-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHICGOZN02 | IL |
| 2006-06-07 | 773-799-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHICGOZN04 | IL |
| 2006-02-03 | 773-437-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHICGOZN09 | IL |
| 2006-02-02 | 773-413-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHICGOZN05 | IL |
| 2006-02-02 | 773-701-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHICGOZN10 | IL |
| 2006-02-02 | 773-974-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHICGOZN11 | IL |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.