NumberResearchThousands-blocks in 973-531
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 973-531 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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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2002-04-16 | 973-531-0XXX | 0000–0999 | Assigned | MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ | 3639 | MENDHAM | NJ |
| 2008-03-12 | 973-531-1XXX | 1000–1999 | Assigned | FUSION, LLC | 482E | MENDHAM | NJ |
| — | 973-531-2XXX | 2000–2999 | Reserved | CABLEVISION LIGHTPATH, INC. - NJ | 4948 | MENDHAM | NJ |
| — | 973-531-3XXX | 3000–3999 | Reserved | CABLEVISION LIGHTPATH, INC. - NJ | 4948 | MENDHAM | NJ |
| 2006-03-24 | 973-531-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MENDHAM | NJ |
| 2025-06-12 | 973-531-5XXX | 5000–5999 | Assigned | TERRA NOVA TELECOM INC. | 145J | MENDHAM | NJ |
| 2006-11-28 | 973-531-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MENDHAM | NJ |
| 2008-11-05 | 973-531-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - NJ | 118F | MENDHAM | NJ |
| — | 973-531-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | MENDHAM | NJ |
| — | 973-531-9XXX | 9000–9999 | Reserved | CABLEVISION LIGHTPATH, INC. - NJ | 4948 | MENDHAM | NJ |
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.