NumberResearchThousands-blocks in 818-401
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 818-401 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 |
|---|---|---|---|---|---|---|---|
| — | 818-401-0XXX | 0000–0999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RESEDA | CA |
| 2002-02-01 | 818-401-1XXX | 1000–1999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | RESEDA | CA |
| 2005-08-23 | 818-401-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RESEDA | CA |
| 2004-04-15 | 818-401-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | RESEDA | CA |
| 2005-09-16 | 818-401-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | RESEDA | CA |
| 2005-12-21 | 818-401-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | RESEDA | CA |
| 2018-11-02 | 818-401-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | RESEDA | CA |
| 2013-05-08 | 818-401-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | RESEDA | CA |
| 2013-05-08 | 818-401-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | RESEDA | CA |
| — | 818-401-9XXX | 9000–9999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RESEDA | 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.