NumberResearchRecent thousands-block assignments
0 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, all time — NPA 331
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-10-15 | 331-279-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | ELMHURST | IL |
| 2021-10-15 | 331-279-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | ELMHURST | IL |
| 2018-10-29 | 331-233-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | DOWNERSGRV | IL |
| 2015-11-03 | 331-814-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | NAPERVILLE | IL |
| 2013-04-22 | 331-803-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | LEMONT | IL |
| 2012-06-18 | 331-228-7XXX | 7000–7999 | Assigned | PAETEC ITEL, LLC | 829J | ST CHARLES | IL |
| 2012-04-24 | 331-228-6XXX | 6000–6999 | Assigned | PAETEC ITEL, LLC | 829J | ST CHARLES | IL |
| 2009-10-29 | 331-442-8XXX | 8000–8999 | Assigned | PAETEC ITEL, LLC | 829J | ST CHARLES | IL |
| 2009-10-29 | 331-725-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | OSWEGO | IL |
| 2009-10-27 | 331-465-6XXX | 6000–6999 | Assigned | PAETEC ITEL, LLC | 829J | W CHICAGO | IL |
| 2009-10-21 | 331-457-8XXX | 8000–8999 | Assigned | PAETEC ITEL, LLC | 829J | NAPERVILLE | IL |
| 2009-10-21 | 331-826-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | ELMHURST | IL |
| 2009-10-08 | 331-454-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | AURORA | IL |
| 2009-09-16 | 331-725-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | OSWEGO | IL |
| 2009-07-14 | 331-472-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | NAPERVILLE | IL |
| 2008-11-10 | 331-465-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | W CHICAGO | IL |
| 2007-08-21 | 331-684-9XXX | 9000–9999 | Assigned | PAETEC ITEL, LLC | 829J | AURORA | 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.