NumberResearchThousands-blocks in 217-923
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 217-923 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
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 217-923-0XXX | 0000–0999 | Reserved | FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL | 1000 | GREENUP | IL |
| 2004-08-13 | 217-923-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | GREENUP | IL |
| 2021-03-10 | 217-923-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | GREENUP | IL |
| — | 217-923-3XXX | 3000–3999 | Reserved | FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL | 1000 | GREENUP | IL |
| 2017-07-24 | 217-923-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | GREENUP | IL |
| — | 217-923-5XXX | 5000–5999 | Reserved | FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL | 1000 | GREENUP | IL |
| 2010-06-30 | 217-923-6XXX | 6000–6999 | Assigned | MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL | 846F | GREENUP | IL |
| 2020-10-26 | 217-923-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | GREENUP | IL |
| 2016-03-21 | 217-923-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | GREENUP | IL |
| 2025-07-09 | 217-923-9XXX | 9000–9999 | Assigned | TERRA NOVA TELECOM INC. | 145J | GREENUP | 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.