NumberResearchThousands-blocks in 610-536
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 610-536 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 610 blocks
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 |
|---|---|---|---|---|---|---|---|
| — | 610-536-0XXX | 0000–0999 | Available | PHPHSBZN21 | PA | ||
| — | 610-536-1XXX | 1000–1999 | Available | PHPHSBZN21 | PA | ||
| 2004-01-30 | 610-536-2XXX | 2000–2999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7315 | PHPHSBZN21 | PA |
| 2019-02-04 | 610-536-3XXX | 3000–3999 | Assigned | CORE COMMUNICATIONS, INC. - PA | 3806 | PHPHSBZN21 | PA |
| 2021-10-12 | 610-536-4XXX | 4000–4999 | Assigned | ONVOY SPECTRUM, LLC | 624H | PHPHSBZN21 | PA |
| 2016-08-24 | 610-536-5XXX | 5000–5999 | Assigned | NUSO, LLC | 551G | PHPHSBZN21 | PA |
| 2008-06-05 | 610-536-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | PHPHSBZN21 | PA |
| 2016-08-24 | 610-536-7XXX | 7000–7999 | Assigned | NUSO, LLC | 551G | PHPHSBZN21 | PA |
| — | 610-536-8XXX | 8000–8999 | Available | PHPHSBZN21 | PA | ||
| — | 610-536-9XXX | 9000–9999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | PHPHSBZN21 | 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.