NumberResearchThousands-blocks in 321-878
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 321-878 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 321 blocks
Most active assignees, all time — NPA 321
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 |
|---|---|---|---|---|---|---|---|
| 2017-06-06 | 321-878-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | COCOABEACH | FL |
| 2017-11-16 | 321-878-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | COCOABEACH | FL |
| 2019-03-11 | 321-878-2XXX | 2000–2999 | Assigned | TELNYX LLC | 073H | COCOABEACH | FL |
| 2019-03-28 | 321-878-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - FL | 982E | COCOABEACH | FL |
| 2019-04-04 | 321-878-4XXX | 4000–4999 | Assigned | CORETEL FLORIDA, INC. - FL | 481F | COCOABEACH | FL |
| 2019-04-04 | 321-878-5XXX | 5000–5999 | Assigned | CORETEL FLORIDA, INC. - FL | 481F | COCOABEACH | FL |
| 2017-04-26 | 321-878-6XXX | 6000–6999 | Assigned | COMMIO, LLC | 939H | COCOABEACH | FL |
| 2018-11-16 | 321-878-7XXX | 7000–7999 | Assigned | ONVOY, LLC - FL | 937C | COCOABEACH | FL |
| 2018-07-26 | 321-878-8XXX | 8000–8999 | Assigned | ONVOY, LLC - FL | 937C | COCOABEACH | FL |
| 2018-11-16 | 321-878-9XXX | 9000–9999 | Assigned | ONVOY, LLC - FL | 937C | COCOABEACH | FL |
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.