NumberResearchThousands-blocks in 636-667
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 636-667 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 636 blocks
Most active assignees, all time — NPA 636
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2004-06-21 | 636-667-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | WASHINGTON | MO |
| 2005-02-22 | 636-667-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | WASHINGTON | MO |
| 2005-07-06 | 636-667-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | WASHINGTON | MO |
| 2006-01-20 | 636-667-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | WASHINGTON | MO |
| 2005-01-04 | 636-667-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | WASHINGTON | MO |
| 2004-06-15 | 636-667-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | WASHINGTON | MO |
| — | 636-667-6XXX | 6000–6999 | Reserved | T-MOBILE USA, INC. | 6529 | WASHINGTON | MO |
| — | 636-667-7XXX | 7000–7999 | Reserved | T-MOBILE USA, INC. | 6529 | WASHINGTON | MO |
| — | 636-667-8XXX | 8000–8999 | Reserved | T-MOBILE USA, INC. | 6529 | WASHINGTON | MO |
| — | 636-667-9XXX | 9000–9999 | Reserved | METROPCS, INC. | 5562 | WASHINGTON | MO |
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.