NumberResearchThousands-blocks in 813-436
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 813-436 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
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 |
|---|---|---|---|---|---|---|---|
| 2008-03-14 | 813-436-0XXX | 0000–0999 | Assigned | BHN IP ENABLED SERVICES, LLC | 045L | TAMPAEST | FL |
| 2005-03-10 | 813-436-1XXX | 1000–1999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | TAMPAEST | FL |
| — | 813-436-2XXX | 2000–2999 | Reserved | LEVEL 3 TELECOM OF FLORIDA, LP - FL | 7635 | TAMPAEST | FL |
| 2012-11-28 | 813-436-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - FL | 982E | TAMPAEST | FL |
| 2009-10-29 | 813-436-4XXX | 4000–4999 | Assigned | YMAX COMMUNICATIONS CORP. - FL | 594D | TAMPAEST | FL |
| — | 813-436-5XXX | 5000–5999 | Reserved | LEVEL 3 TELECOM OF FLORIDA, LP - FL | 7635 | TAMPAEST | FL |
| 2003-10-16 | 813-436-6XXX | 6000–6999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | TAMPAEST | FL |
| 2003-10-16 | 813-436-7XXX | 7000–7999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | TAMPAEST | FL |
| 2007-08-06 | 813-436-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | TAMPAEST | FL |
| 2005-04-20 | 813-436-9XXX | 9000–9999 | Assigned | MCI WORLDCOM COMMUNICATIONS, INC. - FL | 7448 | TAMPAEST | 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.