NumberResearchThousands-blocks in 260-503
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 260-503 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 260 blocks
Most active assignees, all time — NPA 260
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2003-12-19 | 260-503-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | COLUMBIACY | IN |
| — | 260-503-1XXX | 1000–1999 | Reserved | METROPCS, INC. | 5562 | COLUMBIACY | IN |
| 2021-06-11 | 260-503-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - IN | 105F | COLUMBIACY | IN |
| 2021-08-05 | 260-503-3XXX | 3000–3999 | Assigned | ONVOY, LLC - IN | 097D | COLUMBIACY | IN |
| 2008-05-28 | 260-503-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | COLUMBIACY | IN |
| 2003-04-22 | 260-503-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | COLUMBIACY | IN |
| 2020-06-25 | 260-503-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IN | 4803 | COLUMBIACY | IN |
| 2011-04-19 | 260-503-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | COLUMBIACY | IN |
| 2012-01-18 | 260-503-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | COLUMBIACY | IN |
| — | 260-503-9XXX | 9000–9999 | Reserved | T-MOBILE USA, INC. | 6529 | COLUMBIACY | IN |
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.