NumberResearchThousands-blocks in 928-557
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 928-557 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 928 blocks
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 |
|---|---|---|---|---|---|---|---|
| 2026-07-24 | 928-557-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ | 6572 | SAFFORD | AZ |
| — | 928-557-1XXX | 1000–1999 | Available | SAFFORD | AZ | ||
| — | 928-557-2XXX | 2000–2999 | Available | SAFFORD | AZ | ||
| — | 928-557-3XXX | 3000–3999 | Available | SAFFORD | AZ | ||
| — | 928-557-4XXX | 4000–4999 | Available | SAFFORD | AZ | ||
| — | 928-557-5XXX | 5000–5999 | Available | SAFFORD | AZ | ||
| — | 928-557-6XXX | 6000–6999 | Available | SAFFORD | AZ | ||
| 2026-08-25 | 928-557-7XXX | 7000–7999 | Assigned | AHOI LLC | 883K | SAFFORD | AZ |
| 2026-07-24 | 928-557-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF ARIZONA, LLC - AZ | 579F | SAFFORD | AZ |
| 2026-01-14 | 928-557-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SAFFORD | AZ |
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.