NumberResearchThousands-blocks in 712-831
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 712-831 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 712 blocks
Most active assignees, all time — NPA 712
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-02-09 | 712-831-0XXX | 0000–0999 | Assigned | GREAT LAKES COMMUNICATION CORP. - IA | 345D | LAKE PARK | IA |
| 2024-08-13 | 712-831-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | LAKE PARK | IA |
| 2024-11-07 | 712-831-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | LAKE PARK | IA |
| 2025-01-14 | 712-831-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | LAKE PARK | IA |
| 2025-03-25 | 712-831-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | LAKE PARK | IA |
| 2022-12-15 | 712-831-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IA | 9877 | LAKE PARK | IA |
| — | 712-831-6XXX | 6000–6999 | Available | LAKE PARK | IA | ||
| — | 712-831-7XXX | 7000–7999 | Assigned (pending) | LAKE PARK | IA | ||
| 2018-09-24 | 712-831-8XXX | 8000–8999 | Assigned | GREAT LAKES COMMUNICATION CORP. - IA | 345D | LAKE PARK | IA |
| 2018-09-24 | 712-831-9XXX | 9000–9999 | Assigned | GREAT LAKES COMMUNICATION CORP. - IA | 345D | LAKE PARK | IA |
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.