NumberResearchThousands-blocks in 205-421
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 205-421 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 205 blocks
Most active assignees, all time — NPA 205
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-02-19 | 205-421-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | BIRMINGHAM | AL |
| — | 205-421-1XXX | 1000–1999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - AL | 8271 | BIRMINGHAM | AL |
| — | 205-421-2XXX | 2000–2999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - AL | 8271 | BIRMINGHAM | AL |
| 2022-12-06 | 205-421-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - AL | 072F | BIRMINGHAM | AL |
| — | 205-421-4XXX | 4000–4999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - AL | 8271 | BIRMINGHAM | AL |
| 2006-03-07 | 205-421-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | BIRMINGHAM | AL |
| 2015-02-19 | 205-421-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | BIRMINGHAM | AL |
| — | 205-421-7XXX | 7000–7999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - AL | 8271 | BIRMINGHAM | AL |
| 2015-02-19 | 205-421-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | BIRMINGHAM | AL |
| 2006-07-24 | 205-421-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL | 7469 | BIRMINGHAM | AL |
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.