NumberResearchThousands-blocks in 973-521
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 973-521 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 |
|---|---|---|---|---|---|---|---|
| 2012-05-23 | 973-521-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ | 6391 | CALDWELL | NJ |
| 2012-05-23 | 973-521-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ | 6391 | CALDWELL | NJ |
| 2012-05-23 | 973-521-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ | 6391 | CALDWELL | NJ |
| 2014-11-18 | 973-521-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | CALDWELL | NJ |
| 2014-12-16 | 973-521-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | CALDWELL | NJ |
| 2011-06-24 | 973-521-5XXX | 5000–5999 | Assigned | PEERLESS NETWORK OF NEW JERSEY, LLC - NJ | 264F | CALDWELL | NJ |
| 2018-05-21 | 973-521-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | CALDWELL | NJ |
| 2011-11-08 | 973-521-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | CALDWELL | NJ |
| 2013-09-20 | 973-521-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF NEW JERSEY, LLC - NJ | 264F | CALDWELL | NJ |
| 2011-10-04 | 973-521-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | CALDWELL | 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.