NumberResearchThousands-blocks in 803-578
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 803-578 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 803 blocks
Most active assignees, all time — NPA 803
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-06-13 | 803-578-0XXX | 0000–0999 | Assigned | LEVEL 3 TELECOM OF SOUTH CAROLINA, LLC - SC | 5344 | FORT MILL | SC |
| 2007-01-30 | 803-578-1XXX | 1000–1999 | Assigned | FORT MILL TEL. CO. | 0521 | FORT MILL | SC |
| 2007-01-30 | 803-578-2XXX | 2000–2999 | Assigned | FORT MILL TEL. CO. | 0521 | FORT MILL | SC |
| 2008-02-19 | 803-578-3XXX | 3000–3999 | Assigned | FORT MILL TEL. CO. | 0521 | FORT MILL | SC |
| 2007-02-15 | 803-578-4XXX | 4000–4999 | Assigned | FORT MILL TEL. CO. | 0521 | FORT MILL | SC |
| 2007-02-15 | 803-578-5XXX | 5000–5999 | Assigned | FORT MILL TEL. CO. | 0521 | FORT MILL | SC |
| 2007-02-15 | 803-578-6XXX | 6000–6999 | Assigned | FORT MILL TEL. CO. | 0521 | FORT MILL | SC |
| 2008-02-27 | 803-578-7XXX | 7000–7999 | Assigned | LEVEL 3 TELECOM OF SOUTH CAROLINA, LLC - SC | 5344 | FORT MILL | SC |
| 2008-03-07 | 803-578-8XXX | 8000–8999 | Assigned | FORT MILL TEL. CO. | 0521 | FORT MILL | SC |
| 2008-04-23 | 803-578-9XXX | 9000–9999 | Assigned | FORT MILL TEL. CO. | 0521 | FORT MILL | SC |
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.