NumberResearchThousands-blocks in 217-866
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 217-866 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 217 blocks
Most active assignees, all time — NPA 217
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2012-08-03 | 217-866-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHAMPAURBN | IL |
| 2010-05-07 | 217-866-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CHAMPAURBN | IL |
| 2021-06-10 | 217-866-2XXX | 2000–2999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | CHAMPAURBN | IL |
| 2020-01-24 | 217-866-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL | 7196 | CHAMPAURBN | IL |
| — | 217-866-4XXX | 4000–4999 | Available | CHAMPAURBN | IL | ||
| — | 217-866-5XXX | 5000–5999 | Available | CHAMPAURBN | IL | ||
| 2021-09-10 | 217-866-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | CHAMPAURBN | IL |
| 2025-09-12 | 217-866-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | CHAMPAURBN | IL |
| 2025-04-16 | 217-866-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | CHAMPAURBN | IL |
| 2020-02-20 | 217-866-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CHAMPAURBN | IL |
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.