NumberResearchThousands-blocks in 210-878
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 210-878 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 210 blocks
Most active assignees, all time — NPA 210
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 210-878-0XXX | 0000–0999 | Reserved | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | SANANTONIO | TX |
| — | 210-878-1XXX | 1000–1999 | Reserved | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | SANANTONIO | TX |
| — | 210-878-2XXX | 2000–2999 | Reserved | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | SANANTONIO | TX |
| — | 210-878-3XXX | 3000–3999 | Reserved | GRANDE COMMUNICATIONS NETWORKS, INC. - TX | 7670 | SANANTONIO | TX |
| 2006-11-22 | 210-878-4XXX | 4000–4999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SANANTONIO | TX |
| 2005-03-21 | 210-878-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX | 6506 | SANANTONIO | TX |
| 2005-03-23 | 210-878-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SANANTONIO | TX |
| 2005-03-23 | 210-878-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | SANANTONIO | TX |
| 2005-03-23 | 210-878-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SANANTONIO | TX |
| 2005-03-23 | 210-878-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SANANTONIO | 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.