NumberResearchThousands-blocks in 505-631
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 505-631 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 505 blocks
Most active assignees, last 30 days — NPA 505
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 |
|---|---|---|---|---|---|---|---|
| 2024-09-10 | 505-631-0XXX | 0000–0999 | Assigned | ONVOY, LLC - NM | 206F | AZTEC | NM |
| 2024-11-19 | 505-631-1XXX | 1000–1999 | Assigned | ONVOY, LLC - NM | 206F | AZTEC | NM |
| 2024-11-21 | 505-631-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM | 6573 | AZTEC | NM |
| 2024-11-21 | 505-631-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM | 6573 | AZTEC | NM |
| 2025-11-26 | 505-631-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | AZTEC | NM |
| — | 505-631-5XXX | 5000–5999 | Available | AZTEC | NM | ||
| — | 505-631-6XXX | 6000–6999 | Available | AZTEC | NM | ||
| 2026-09-03 | 505-631-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - NM | 123F | AZTEC | NM |
| 2026-07-09 | 505-631-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - NM | 123F | AZTEC | NM |
| 2025-02-07 | 505-631-9XXX | 9000–9999 | Assigned | ONVOY, LLC - NM | 206F | AZTEC | NM |
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.