NumberResearchThousands-blocks in 818-306
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 818-306 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 818 blocks
Most active assignees, all time — NPA 818
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2005-12-27 | 818-306-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | LACRSCENTA | CA |
| 2022-09-23 | 818-306-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | LACRSCENTA | CA |
| 2014-07-22 | 818-306-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | LACRSCENTA | CA |
| 2005-03-21 | 818-306-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | LACRSCENTA | CA |
| 2003-08-05 | 818-306-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | LACRSCENTA | CA |
| 2005-03-21 | 818-306-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | LACRSCENTA | CA |
| 2014-11-19 | 818-306-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | LACRSCENTA | CA |
| 2005-06-01 | 818-306-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | LACRSCENTA | CA |
| 2014-11-19 | 818-306-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | LACRSCENTA | CA |
| 2005-12-20 | 818-306-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CA | 649C | LACRSCENTA | CA |
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.