NumberResearchThousands-blocks in 667-333
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 667-333 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 667 blocks
Most active assignees, all time — NPA 667
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 |
|---|---|---|---|---|---|---|---|
| 2022-07-13 | 667-333-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | ARGRGBSNIS | MD |
| 2022-09-01 | 667-333-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | ARGRGBSNIS | MD |
| 2020-12-30 | 667-333-2XXX | 2000–2999 | Assigned | TERRA NOVA TELECOM INC. | 145J | ARGRGBSNIS | MD |
| 2015-05-18 | 667-333-3XXX | 3000–3999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ARGRGBSNIS | MD |
| 2022-07-13 | 667-333-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | ARGRGBSNIS | MD |
| 2022-07-13 | 667-333-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | ARGRGBSNIS | MD |
| 2019-05-16 | 667-333-6XXX | 6000–6999 | Assigned | CORE COMMUNICATIONS, INC.- MD | 2593 | ARGRGBSNIS | MD |
| 2019-05-16 | 667-333-7XXX | 7000–7999 | Assigned | CORE COMMUNICATIONS, INC.- MD | 2593 | ARGRGBSNIS | MD |
| 2021-04-23 | 667-333-8XXX | 8000–8999 | Assigned | ONVOY SPECTRUM, LLC | 624H | ARGRGBSNIS | MD |
| 2016-05-03 | 667-333-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | ARGRGBSNIS | MD |
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.