NumberResearchThousands-blocks in 205-255
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 205-255 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
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 205-255-0XXX | 0000–0999 | Reserved | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | DORA | AL |
| 2019-02-11 | 205-255-1XXX | 1000–1999 | Assigned | ONVOY, LLC - AL | 604E | DORA | AL |
| 2019-04-04 | 205-255-2XXX | 2000–2999 | Assigned | CORETEL ALABAMA, INC. - AL | 476F | DORA | AL |
| 2008-05-06 | 205-255-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AL | 5255 | DORA | AL |
| 2017-04-06 | 205-255-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AL | 7469 | DORA | AL |
| 2019-05-09 | 205-255-5XXX | 5000–5999 | Assigned | TELNYX LLC | 073H | DORA | AL |
| 2008-06-10 | 205-255-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | DORA | AL |
| 2012-05-14 | 205-255-7XXX | 7000–7999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | DORA | AL |
| 2009-02-18 | 205-255-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AL | 604E | DORA | AL |
| 2019-02-11 | 205-255-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AL | 604E | DORA | AL |
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.