NumberResearchRecent thousands-block assignments
10 blocks assigned in May 2026 · 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, May 2026 — NPA 331
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-05-27 | 331-462-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LOMBARD | IL |
| 2026-05-26 | 331-338-6XXX | 6000–6999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | AURORA | IL |
| 2026-05-26 | 331-339-3XXX | 3000–3999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | AURORA | IL |
| 2026-05-18 | 331-346-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | NAPERVILLE | IL |
| 2026-05-11 | 331-208-3XXX | 3000–3999 | Assigned | TERRA NOVA TELECOM INC. | 145J | AURORA | IL |
| 2026-05-08 | 331-205-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | AURORA | IL |
| 2026-05-07 | 331-342-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | NAPERVILLE | IL |
| 2026-05-01 | 331-325-3XXX | 3000–3999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | LEMONT | IL |
| 2026-05-01 | 331-325-4XXX | 4000–4999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | LEMONT | IL |
| 2026-05-01 | 331-325-5XXX | 5000–5999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | LEMONT | 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.