NumberResearchThousands-blocks in 636-671
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 636-671 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 636-671-0XXX | 0000–0999 | Reserved | SOUTHWESTERN BELL | 9533 | HIGH RIDGE | MO |
| — | 636-671-1XXX | 1000–1999 | Reserved | SOUTHWESTERN BELL | 9533 | HIGH RIDGE | MO |
| 2010-12-07 | 636-671-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | HIGH RIDGE | MO |
| — | 636-671-3XXX | 3000–3999 | Reserved | SOUTHWESTERN BELL | 9533 | HIGH RIDGE | MO |
| 2014-02-11 | 636-671-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | HIGH RIDGE | MO |
| 2002-10-28 | 636-671-5XXX | 5000–5999 | Assigned | ONVOY, LLC - MO | 093F | HIGH RIDGE | MO |
| — | 636-671-6XXX | 6000–6999 | Reserved | SOUTHWESTERN BELL | 9533 | HIGH RIDGE | MO |
| 2008-07-22 | 636-671-7XXX | 7000–7999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | HIGH RIDGE | MO |
| — | 636-671-8XXX | 8000–8999 | Reserved | SOUTHWESTERN BELL | 9533 | HIGH RIDGE | MO |
| 2005-10-04 | 636-671-9XXX | 9000–9999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | HIGH RIDGE | 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.