NumberResearchThousands-blocks in 878-291
This prefix’s ten 1,000-number blocks and who holds each — 1 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 878-291 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
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2023-10-26 | 878-291-6XXX | 6000–6999 | Assigned | ADVANCED TELEPHONE SYS INC DBA HTC COMMUNICATIONS | 2522 | TAYLORSTN | 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.