NumberResearchThousands-blocks in 817-508
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 817-508 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 817 blocks
Most active assignees, all time — NPA 817
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 817-508-0XXX | 0000–0999 | Reserved | TWC IP ENABLED SERVICES, LLC | 793K | EULESS | TX |
| 2022-04-06 | 817-508-1XXX | 1000–1999 | Assigned | TERRA NOVA TELECOM INC. | 145J | EULESS | TX |
| 2023-03-29 | 817-508-2XXX | 2000–2999 | Assigned | ONVOY, LLC - TX | 903C | EULESS | TX |
| 2015-09-23 | 817-508-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | EULESS | TX |
| 2015-03-16 | 817-508-4XXX | 4000–4999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | EULESS | TX |
| 2010-10-26 | 817-508-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | EULESS | TX |
| 2021-02-12 | 817-508-6XXX | 6000–6999 | Assigned | TELNYX LLC | 073H | EULESS | TX |
| — | 817-508-7XXX | 7000–7999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | EULESS | TX |
| 2011-04-20 | 817-508-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | EULESS | TX |
| 2016-10-24 | 817-508-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TX | 903C | EULESS | TX |
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.