NumberResearchThousands-blocks in 351-204
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 351-204 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 351 blocks
Most active assignees, all time — NPA 351
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-02-02 | 351-204-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | LAWRENCE | MA |
| 2019-03-27 | 351-204-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | LAWRENCE | MA |
| 2020-02-12 | 351-204-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | LAWRENCE | MA |
| 2018-09-12 | 351-204-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | LAWRENCE | MA |
| 2023-04-24 | 351-204-4XXX | 4000–4999 | Assigned | ONVOY, LLC - MA | 892D | LAWRENCE | MA |
| 2025-10-29 | 351-204-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | LAWRENCE | MA |
| 2025-10-29 | 351-204-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | LAWRENCE | MA |
| 2019-03-18 | 351-204-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | LAWRENCE | MA |
| 2021-09-02 | 351-204-8XXX | 8000–8999 | Assigned | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | LAWRENCE | MA |
| 2018-06-26 | 351-204-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | LAWRENCE | MA |
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.