NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, all time — NPA 520
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2020-09-14 | 520-619-6XXX | 6000–6999 | Assigned | MCC TELEPHONY LLC | 593K | NOGALES | AZ |
| 2017-04-28 | 520-341-3XXX | 3000–3999 | Assigned | MCC TELEPHONY LLC | 593K | NOGALES | AZ |
| 2012-03-07 | 520-415-1XXX | 1000–1999 | Assigned | MCC TELEPHONY LLC | 593K | NOGALES | AZ |
| 2011-01-06 | 520-463-9XXX | 9000–9999 | Assigned | MCC TELEPHONY LLC | 593K | WHITLOW | AZ |
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.