NumberResearchThousands-blocks in 520-332
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 520-332 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 520 blocks
Most active assignees, all time — NPA 520
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 |
|---|---|---|---|---|---|---|---|
| 2012-08-29 | 520-332-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2012-08-21 | 520-332-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | TUCSON | AZ |
| 2012-05-24 | 520-332-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | TUCSON | AZ |
| 2012-08-01 | 520-332-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
| 2012-05-29 | 520-332-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2012-05-29 | 520-332-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2013-03-22 | 520-332-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AZ | 3285 | TUCSON | AZ |
| 2012-05-18 | 520-332-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | TUCSON | AZ |
| 2012-05-18 | 520-332-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | TUCSON | AZ |
| 2012-05-18 | 520-332-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | TUCSON | AZ |
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.