NumberResearchThousands-blocks in 878-301
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 878-301 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 878 blocks
Most active assignees, all time — NPA 878
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2023-08-03 | 878-301-0XXX | 0000–0999 | Assigned | ONVOY SPECTRUM, LLC | 624H | SMOCK | PA |
| 2023-09-20 | 878-301-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | SMOCK | PA |
| — | 878-301-2XXX | 2000–2999 | Available | SMOCK | PA | ||
| — | 878-301-3XXX | 3000–3999 | Available | SMOCK | PA | ||
| — | 878-301-4XXX | 4000–4999 | Available | SMOCK | PA | ||
| — | 878-301-5XXX | 5000–5999 | Available | SMOCK | PA | ||
| — | 878-301-6XXX | 6000–6999 | Available | SMOCK | PA | ||
| — | 878-301-7XXX | 7000–7999 | Available | SMOCK | PA | ||
| — | 878-301-8XXX | 8000–8999 | Available | SMOCK | PA | ||
| — | 878-301-9XXX | 9000–9999 | Available | SMOCK | PA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.