NumberResearchThousands-blocks in 712-357
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 712-357 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 |
|---|---|---|---|---|---|---|---|
| 2017-04-21 | 712-357-0XXX | 0000–0999 | Assigned | ONVOY, LLC - IA | 221F | RED OAK | IA |
| 2010-03-09 | 712-357-1XXX | 1000–1999 | Assigned | MCC TELEPHONY LLC | 593K | RED OAK | IA |
| 2018-07-30 | 712-357-2XXX | 2000–2999 | Assigned | AUREON COMMUNICATIONS, LLC | 444G | RED OAK | IA |
| 2010-06-29 | 712-357-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | RED OAK | IA |
| 2017-08-08 | 712-357-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IA | 8344 | RED OAK | IA |
| 2012-04-25 | 712-357-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - IA | 985E | RED OAK | IA |
| 2014-12-19 | 712-357-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | RED OAK | IA |
| 2013-03-05 | 712-357-7XXX | 7000–7999 | Assigned | ONVOY, LLC - IA | 221F | RED OAK | IA |
| 2016-03-14 | 712-357-8XXX | 8000–8999 | Assigned | ONVOY, LLC - IA | 221F | RED OAK | IA |
| 2016-03-14 | 712-357-9XXX | 9000–9999 | Assigned | ONVOY, LLC - IA | 221F | RED OAK | 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.