NumberResearchThousands-blocks in 817-527
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 817-527 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 |
|---|---|---|---|---|---|---|---|
| — | 817-527-0XXX | 0000–0999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GRAPEVINE | TX |
| 2011-06-04 | 817-527-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - TX | 004F | GRAPEVINE | TX |
| 2009-10-15 | 817-527-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GRAPEVINE | TX |
| 2007-08-02 | 817-527-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | GRAPEVINE | TX |
| 2009-02-24 | 817-527-4XXX | 4000–4999 | Assigned | PAETEC ITEL, LLC | 829J | GRAPEVINE | TX |
| 2012-05-25 | 817-527-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - TX | 004F | GRAPEVINE | TX |
| 2011-05-23 | 817-527-6XXX | 6000–6999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | GRAPEVINE | TX |
| 2014-10-21 | 817-527-7XXX | 7000–7999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | GRAPEVINE | TX |
| 2013-03-28 | 817-527-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - TX | 004F | GRAPEVINE | TX |
| 2016-10-03 | 817-527-9XXX | 9000–9999 | Assigned | ONVOY, LLC - TX | 903C | GRAPEVINE | 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.