NumberResearchThousands-blocks in 636-821
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 636-821 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 |
|---|---|---|---|---|---|---|---|
| — | 636-821-0XXX | 0000–0999 | Available | POND | MO | ||
| 2003-12-03 | 636-821-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | POND | MO |
| — | 636-821-2XXX | 2000–2999 | Reserved | PAETEC ITEL, LLC | 829J | POND | MO |
| 2006-03-21 | 636-821-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | POND | MO |
| 2005-09-13 | 636-821-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MO | 4932 | POND | MO |
| 2009-07-21 | 636-821-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | POND | MO |
| 2010-01-19 | 636-821-6XXX | 6000–6999 | Assigned | PEERLESS NETWORK OF MISSOURI, LLC - MO | 225F | POND | MO |
| 2023-07-14 | 636-821-7XXX | 7000–7999 | Assigned | ONVOY, LLC - MO | 093F | POND | MO |
| 2004-11-17 | 636-821-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MO | 4932 | POND | MO |
| — | 636-821-9XXX | 9000–9999 | Available | POND | 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.