NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/25/2026
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
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2007-06-29 | 610-343-2XXX | 2000–2999 | Assigned | CTSI, INC. - PA | 7513 | DOWNINGTN | PA |
| 2007-05-14 | 610-488-3XXX | 3000–3999 | Assigned | CTSI, INC. - PA | 7513 | BERNVILLE | PA |
| 2007-05-14 | 610-589-8XXX | 8000–8999 | Assigned | CTSI, INC. - PA | 7513 | WOMELSDORF | PA |
| 2007-05-14 | 610-693-2XXX | 2000–2999 | Assigned | CTSI, INC. - PA | 7513 | ROBESONIA | PA |
| 2007-01-09 | 610-603-7XXX | 7000–7999 | Assigned | CTSI, INC. - PA | 7513 | READING | PA |
| 2006-11-09 | 610-400-6XXX | 6000–6999 | Assigned | CTSI, INC. - PA | 7513 | COATESVL | PA |
| 2005-06-14 | 610-205-4XXX | 4000–4999 | Assigned | CTSI, INC. - PA | 7513 | PHPHSBZN30 | PA |
| 2005-06-14 | 610-629-2XXX | 2000–2999 | Assigned | CTSI, INC. - PA | 7513 | PHPHSBZN31 | PA |
| 2005-06-14 | 610-746-8XXX | 8000–8999 | Assigned | CTSI, INC. - PA | 7513 | NAZARETH | PA |
| 2004-08-10 | 610-603-3XXX | 3000–3999 | Assigned | CTSI, INC. - PA | 7513 | READING | PA |
| 2004-08-10 | 610-603-5XXX | 5000–5999 | Assigned | CTSI, INC. - PA | 7513 | READING | PA |
| 2004-03-30 | 610-370-8XXX | 8000–8999 | Assigned | CTSI, INC. - PA | 7513 | READING | PA |
| 2003-04-16 | 610-603-2XXX | 2000–2999 | Assigned | CTSI, INC. - PA | 7513 | READING | PA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.