NumberResearchThousands-blocks in 818-923
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 818-923 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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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2007-07-19 | 818-923-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | SNFN GRHL | CA |
| 2010-01-28 | 818-923-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SNFN GRHL | CA |
| 2009-10-05 | 818-923-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNFN GRHL | CA |
| 2008-05-05 | 818-923-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNFN GRHL | CA |
| 2009-05-04 | 818-923-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNFN GRHL | CA |
| 2009-05-21 | 818-923-5XXX | 5000–5999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SNFN GRHL | CA |
| 2006-11-16 | 818-923-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SNFN GRHL | CA |
| 2007-04-06 | 818-923-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | SNFN GRHL | CA |
| 2007-04-03 | 818-923-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNFN GRHL | CA |
| 2007-04-03 | 818-923-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNFN GRHL | 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.