NumberResearchThousands-blocks in 818-273
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 818-273 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
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-08-21 | 818-273-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | SUNLD TJNG | CA |
| 2006-09-07 | 818-273-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SUNLD TJNG | CA |
| — | 818-273-2XXX | 2000–2999 | Reserved | FRONTIER CALIFORNIA INC. | 2319 | SUNLD TJNG | CA |
| 2006-06-07 | 818-273-3XXX | 3000–3999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | SUNLD TJNG | CA |
| 2006-12-05 | 818-273-4XXX | 4000–4999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SUNLD TJNG | CA |
| 2006-12-14 | 818-273-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | SUNLD TJNG | CA |
| 2008-07-18 | 818-273-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | SUNLD TJNG | CA |
| 2008-05-02 | 818-273-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | SUNLD TJNG | CA |
| 2002-07-24 | 818-273-8XXX | 8000–8999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | SUNLD TJNG | CA |
| 2008-12-09 | 818-273-9XXX | 9000–9999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SUNLD TJNG | 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.