NumberResearchThousands-blocks in 973-520
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 973-520 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
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-03-09 | 973-520-0XXX | 0000–0999 | Assigned | ONVOY, LLC - NJ | 637C | MADISON | NJ |
| — | 973-520-1XXX | 1000–1999 | Reserved | MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ | 3639 | MADISON | NJ |
| 2007-05-31 | 973-520-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MADISON | NJ |
| 2015-10-15 | 973-520-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | MADISON | NJ |
| 2007-10-25 | 973-520-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | MADISON | NJ |
| 2016-03-09 | 973-520-5XXX | 5000–5999 | Assigned | ONVOY, LLC - NJ | 637C | MADISON | NJ |
| 2010-07-28 | 973-520-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - NJ | 118F | MADISON | NJ |
| 2010-07-28 | 973-520-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - NJ | 118F | MADISON | NJ |
| 2008-02-13 | 973-520-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | MADISON | NJ |
| 2008-03-19 | 973-520-9XXX | 9000–9999 | Assigned | FUSION, LLC | 482E | MADISON | 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.