NumberResearchThousands-blocks in 442-266
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 442-266 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 442 blocks
Most active assignees, all time — NPA 442
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-04-01 | 442-266-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | OCSD OCSD | CA |
| 2017-06-15 | 442-266-1XXX | 1000–1999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | OCSD OCSD | CA |
| 2017-09-28 | 442-266-2XXX | 2000–2999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | OCSD OCSD | CA |
| 2021-07-14 | 442-266-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | OCSD OCSD | CA |
| 2021-02-22 | 442-266-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | OCSD OCSD | CA |
| 2018-10-08 | 442-266-5XXX | 5000–5999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | OCSD OCSD | CA |
| 2019-08-07 | 442-266-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7147 | OCSD OCSD | CA |
| 2017-10-31 | 442-266-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | OCSD OCSD | CA |
| 2019-01-29 | 442-266-8XXX | 8000–8999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | OCSD OCSD | CA |
| 2021-02-22 | 442-266-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | OCSD OCSD | CA |
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.