NumberResearchThousands-blocks in 206-687
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 206-687 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 206 blocks
Most active assignees, all time — NPA 206
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2010-09-24 | 206-687-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | SEATTLE | WA |
| — | 206-687-1XXX | 1000–1999 | Reserved | ONVOY, LLC - WA | 483E | SEATTLE | WA |
| 2011-06-09 | 206-687-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | SEATTLE | WA |
| 2011-06-09 | 206-687-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | SEATTLE | WA |
| — | 206-687-4XXX | 4000–4999 | Reserved | ONVOY, LLC - WA | 483E | SEATTLE | WA |
| 2011-07-13 | 206-687-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | SEATTLE | WA |
| 2011-07-13 | 206-687-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SEATTLE | WA |
| 2011-02-09 | 206-687-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | SEATTLE | WA |
| 2011-07-13 | 206-687-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SEATTLE | WA |
| 2010-12-10 | 206-687-9XXX | 9000–9999 | Assigned | ONVOY, LLC - WA | 483E | SEATTLE | WA |
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.