NumberResearchThousands-blocks in 325-576
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 325-576 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 325 blocks
Most active assignees, all time — NPA 325
New assignments by month
Sep 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-11-10 | 325-576-0XXX | 0000–0999 | Assigned | ONVOY SPECTRUM, LLC | 624H | HAMLIN | TX |
| — | 325-576-1XXX | 1000–1999 | Reserved | SOUTHWESTERN BELL | 9533 | HAMLIN | TX |
| — | 325-576-2XXX | 2000–2999 | Available | HAMLIN | TX | ||
| — | 325-576-3XXX | 3000–3999 | Reserved | SOUTHWESTERN BELL | 9533 | HAMLIN | TX |
| 2023-12-10 | 325-576-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | HAMLIN | TX |
| 2011-12-12 | 325-576-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HAMLIN | TX |
| 2014-07-29 | 325-576-6XXX | 6000–6999 | Assigned | ONVOY, LLC - TX | 903C | HAMLIN | TX |
| 2015-05-18 | 325-576-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | HAMLIN | TX |
| 2023-06-26 | 325-576-8XXX | 8000–8999 | Assigned | ONVOY, LLC - TX | 903C | HAMLIN | TX |
| 2023-12-10 | 325-576-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | HAMLIN | TX |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.