NumberResearchRecent thousands-block assignments
0 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, all time — NPA 531
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-03-16 | 531-217-7XXX | 7000–7999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | PLATTSMTH | NE |
| 2026-03-16 | 531-358-4XXX | 4000–4999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | LOUISVILLE | NE |
| 2026-03-16 | 531-377-2XXX | 2000–2999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | WAHOO | NE |
| 2026-03-13 | 531-394-2XXX | 2000–2999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | ASHLAND | NE |
| 2024-09-27 | 531-441-1XXX | 1000–1999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | MEAD | NE |
| 2024-05-23 | 531-308-1XXX | 1000–1999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | MALCOLM | NE |
| 2017-08-11 | 531-207-0XXX | 0000–0999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | LINCOLN | NE |
| 2017-06-29 | 531-218-0XXX | 0000–0999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | LINCOLN | NE |
| 2016-05-31 | 531-500-6XXX | 6000–6999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | LINCOLN | NE |
| 2015-09-14 | 531-289-7XXX | 7000–7999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | LINCOLN | NE |
| 2015-05-28 | 531-739-3XXX | 3000–3999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | LINCOLN | NE |
| 2015-05-28 | 531-739-5XXX | 5000–5999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | LINCOLN | NE |
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.