NumberResearchThousands-blocks in 409-373
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 409-373 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 409 blocks
Most active assignees, all time — NPA 409
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2010-09-07 | 409-373-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | SILSBEE | TX |
| 2015-05-21 | 409-373-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | SILSBEE | TX |
| 2011-12-27 | 409-373-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SILSBEE | TX |
| 2010-05-27 | 409-373-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | SILSBEE | TX |
| 2005-08-04 | 409-373-4XXX | 4000–4999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SILSBEE | TX |
| 2010-10-12 | 409-373-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7239 | SILSBEE | TX |
| 2010-12-02 | 409-373-6XXX | 6000–6999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SILSBEE | TX |
| 2008-12-09 | 409-373-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7138 | SILSBEE | TX |
| 2015-05-29 | 409-373-8XXX | 8000–8999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SILSBEE | TX |
| 2018-05-29 | 409-373-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | SILSBEE | TX |
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.