NumberResearchThousands-blocks in 712-350
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/21/2026
The ten 1,000-number thousand-blocks inside prefix 712-350 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
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 712-350-0XXX | 0000–0999 | Reserved | UNITED STATES CELLULAR - IA | 6266 | HAMBURG | IA |
| — | 712-350-1XXX | 1000–1999 | Reserved | UNITED STATES CELLULAR - IA | 6266 | HAMBURG | IA |
| 2016-06-22 | 712-350-2XXX | 2000–2999 | Assigned | ONVOY, LLC - IA | 221F | HAMBURG | IA |
| 2018-06-20 | 712-350-3XXX | 3000–3999 | Assigned | TELNYX LLC | 073H | HAMBURG | IA |
| 2022-09-28 | 712-350-4XXX | 4000–4999 | Assigned | COMMIO, LLC | 939H | HAMBURG | IA |
| 2019-08-23 | 712-350-5XXX | 5000–5999 | Assigned | ONVOY, LLC - IA | 221F | HAMBURG | IA |
| 2017-05-03 | 712-350-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HAMBURG | IA |
| 2015-11-23 | 712-350-7XXX | 7000–7999 | Assigned | ONVOY, LLC - IA | 221F | HAMBURG | IA |
| 2016-03-16 | 712-350-8XXX | 8000–8999 | Assigned | ONVOY, LLC - IA | 221F | HAMBURG | IA |
| 2016-03-16 | 712-350-9XXX | 9000–9999 | Assigned | ONVOY, LLC - IA | 221F | HAMBURG | IA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.