NumberResearchThousands-blocks in 973-387
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 973-387 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 973 blocks
Most active assignees, all time — NPA 973
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 973-387-0XXX | 0000–0999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | MORRISTOWN | NJ |
| 2008-08-25 | 973-387-1XXX | 1000–1999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MORRISTOWN | NJ |
| — | 973-387-2XXX | 2000–2999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | MORRISTOWN | NJ |
| 2008-08-06 | 973-387-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | MORRISTOWN | NJ |
| 2006-05-04 | 973-387-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | MORRISTOWN | NJ |
| 2008-12-03 | 973-387-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ | 6391 | MORRISTOWN | NJ |
| 2025-03-20 | 973-387-6XXX | 6000–6999 | Assigned | ONVOY, LLC - NJ | 637C | MORRISTOWN | NJ |
| 2010-08-11 | 973-387-7XXX | 7000–7999 | Assigned | CABLEVISION LIGHTPATH, INC. - NJ | 4948 | MORRISTOWN | NJ |
| — | 973-387-8XXX | 8000–8999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | MORRISTOWN | NJ |
| — | 973-387-9XXX | 9000–9999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | MORRISTOWN | NJ |
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.