NumberResearchThousands-blocks in 878-333
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 878-333 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
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-03-02 | 878-333-0XXX | 0000–0999 | Assigned | ONVOY, LLC - PA | 547E | ELLWOOD CY | PA |
| 2016-03-02 | 878-333-1XXX | 1000–1999 | Assigned | ONVOY, LLC - PA | 547E | ELLWOOD CY | PA |
| 2017-07-25 | 878-333-2XXX | 2000–2999 | Assigned | TELNYX LLC | 073H | ELLWOOD CY | PA |
| 2015-06-30 | 878-333-3XXX | 3000–3999 | Assigned | ONVOY, LLC - PA | 547E | ELLWOOD CY | PA |
| 2015-07-14 | 878-333-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | ELLWOOD CY | PA |
| 2017-12-13 | 878-333-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | ELLWOOD CY | PA |
| 2017-12-13 | 878-333-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | ELLWOOD CY | PA |
| 2017-10-27 | 878-333-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | ELLWOOD CY | PA |
| 2017-06-19 | 878-333-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | ELLWOOD CY | PA |
| 2016-08-08 | 878-333-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF PENNSYLVANIA, LLC - PA | 967E | ELLWOOD CY | PA |
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.