NumberResearchThousands-blocks in 813-551
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 813-551 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 813 blocks
Most active assignees, all time — NPA 813
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2014-09-30 | 813-551-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - FL | 982E | TAMPAWST | FL |
| 2014-09-30 | 813-551-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - FL | 982E | TAMPAWST | FL |
| 2014-09-30 | 813-551-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - FL | 982E | TAMPAWST | FL |
| 2014-09-30 | 813-551-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - FL | 982E | TAMPAWST | FL |
| 2016-05-19 | 813-551-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | TAMPAWST | FL |
| 2016-05-19 | 813-551-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | TAMPAWST | FL |
| 2016-05-19 | 813-551-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | TAMPAWST | FL |
| 2016-02-19 | 813-551-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | TAMPAWST | FL |
| 2016-02-19 | 813-551-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | TAMPAWST | FL |
| 2015-09-22 | 813-551-9XXX | 9000–9999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | TAMPAWST | FL |
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.