NumberResearchThousands-blocks in 803-857
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 803-857 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2011-04-27 | 803-857-0XXX | 0000–0999 | Assigned | SUNCOM DBA T-MOBILE USA | 8645 | SANTEE | SC |
| — | 803-857-1XXX | 1000–1999 | Reserved | SUNCOM DBA T-MOBILE USA | 8645 | SANTEE | SC |
| 2011-08-19 | 803-857-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - SC | 077F | SANTEE | SC |
| 2012-01-04 | 803-857-3XXX | 3000–3999 | Assigned | SUNCOM DBA T-MOBILE USA | 8645 | SANTEE | SC |
| 2015-05-20 | 803-857-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - SC | 077F | SANTEE | SC |
| 2021-04-16 | 803-857-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | SANTEE | SC |
| — | 803-857-6XXX | 6000–6999 | Reserved | SUNCOM DBA T-MOBILE USA | 8645 | SANTEE | SC |
| 2015-04-22 | 803-857-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | SANTEE | SC |
| 2013-12-13 | 803-857-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - SC | 5258 | SANTEE | SC |
| — | 803-857-9XXX | 9000–9999 | Reserved | SUNCOM DBA T-MOBILE USA | 8645 | SANTEE | 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.