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 610
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 |
|---|---|---|---|---|---|---|---|
| 2010-06-24 | 610-276-2XXX | 2000–2999 | Assigned | AT&T - LOCAL | 7421 | PHPHSBZN31 | PA |
| 2002-08-22 | 610-427-6XXX | 6000–6999 | Assigned | AT&T - LOCAL | 7421 | POTTSTOWN | PA |
| 2002-04-11 | 610-362-8XXX | 8000–8999 | Assigned | AT&T - LOCAL | 7421 | PHPHSBZN14 | PA |
| 2001-12-13 | 610-479-6XXX | 6000–6999 | Assigned | AT&T - LOCAL | 7421 | PHPHSBZN10 | PA |
| 2001-11-09 | 610-479-3XXX | 3000–3999 | Assigned | AT&T - LOCAL | 7421 | PHPHSBZN10 | PA |
| 2001-11-09 | 610-479-4XXX | 4000–4999 | Assigned | AT&T - LOCAL | 7421 | PHPHSBZN10 | PA |
| 2001-11-09 | 610-479-5XXX | 5000–5999 | Assigned | AT&T - LOCAL | 7421 | PHPHSBZN10 | PA |
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.