NumberResearchThousands-blocks in 575-318
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 575-318 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 575 blocks
Most active assignees, all time — NPA 575
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2011-05-25 | 575-318-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | HOBBS | NM |
| — | 575-318-1XXX | 1000–1999 | Reserved | METROPCS, INC. | 5562 | HOBBS | NM |
| 2004-05-04 | 575-318-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NM | 5470 | HOBBS | NM |
| — | 575-318-3XXX | 3000–3999 | Reserved | METROPCS, INC. | 5562 | HOBBS | NM |
| — | 575-318-4XXX | 4000–4999 | Reserved | METROPCS, INC. | 5562 | HOBBS | NM |
| 2005-10-04 | 575-318-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | HOBBS | NM |
| — | 575-318-6XXX | 6000–6999 | Reserved | METROPCS, INC. | 5562 | HOBBS | NM |
| 2005-02-21 | 575-318-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | HOBBS | NM |
| 2004-10-05 | 575-318-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | HOBBS | NM |
| — | 575-318-9XXX | 9000–9999 | Reserved | T-MOBILE USA, INC. | 6529 | HOBBS | NM |
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.