NumberResearchThousands-blocks in 978-600
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 978-600 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 978 blocks
Most active assignees, all time — NPA 978
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 978-600-0XXX | 0000–0999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BILLERICA | MA |
| — | 978-600-1XXX | 1000–1999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BILLERICA | MA |
| — | 978-600-2XXX | 2000–2999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BILLERICA | MA |
| 2022-04-11 | 978-600-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | BILLERICA | MA |
| — | 978-600-4XXX | 4000–4999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BILLERICA | MA |
| 2024-11-15 | 978-600-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | BILLERICA | MA |
| 2024-11-15 | 978-600-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | BILLERICA | MA |
| — | 978-600-7XXX | 7000–7999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BILLERICA | MA |
| 2010-01-22 | 978-600-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MA | 990E | BILLERICA | MA |
| 2024-02-05 | 978-600-9XXX | 9000–9999 | Assigned | COMMIO, LLC | 939H | BILLERICA | MA |
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.