NumberResearchThousands-blocks in 254-577
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 254-577 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 254 blocks
Most active assignees, all time — NPA 254
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2009-11-10 | 254-577-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | COPPERASCV | TX |
| 2011-01-25 | 254-577-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | COPPERASCV | TX |
| 2011-07-12 | 254-577-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | COPPERASCV | TX |
| 2011-01-11 | 254-577-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TX | 7249 | COPPERASCV | TX |
| 2005-03-18 | 254-577-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | COPPERASCV | TX |
| 2006-02-08 | 254-577-5XXX | 5000–5999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | COPPERASCV | TX |
| 2008-02-06 | 254-577-6XXX | 6000–6999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | COPPERASCV | TX |
| 2008-02-06 | 254-577-7XXX | 7000–7999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | COPPERASCV | TX |
| 2010-12-02 | 254-577-8XXX | 8000–8999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | COPPERASCV | TX |
| 2010-07-30 | 254-577-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | COPPERASCV | TX |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.