NumberResearchThousands-blocks in 331-240
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026
The ten 1,000-number thousand-blocks inside prefix 331-240 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 331 blocks
Most active assignees, all time — NPA 331
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2013-11-22 | 331-240-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | W CHICAGO | IL |
| 2014-02-13 | 331-240-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | W CHICAGO | IL |
| 2013-11-08 | 331-240-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | W CHICAGO | IL |
| 2013-04-12 | 331-240-3XXX | 3000–3999 | Assigned | PEERLESS NETWORK OF ILLINOIS, LLC - IL | 063E | W CHICAGO | IL |
| 2013-04-12 | 331-240-4XXX | 4000–4999 | Assigned | PEERLESS NETWORK OF ILLINOIS, LLC - IL | 063E | W CHICAGO | IL |
| 2013-10-18 | 331-240-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | W CHICAGO | IL |
| 2013-10-18 | 331-240-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | W CHICAGO | IL |
| 2013-10-18 | 331-240-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | W CHICAGO | IL |
| 2013-10-18 | 331-240-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | W CHICAGO | IL |
| 2014-02-13 | 331-240-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | W CHICAGO | 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.