NumberResearchThousands-blocks in 605-857
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 605-857 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 605 blocks
Most active assignees, all time — NPA 605
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 605-857-0XXX | 0000–0999 | Reserved | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | YANKTON | SD |
| — | 605-857-1XXX | 1000–1999 | Reserved | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | YANKTON | SD |
| 2018-09-13 | 605-857-2XXX | 2000–2999 | Assigned | TELNYX LLC | 073H | YANKTON | SD |
| 2014-10-10 | 605-857-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - SD | 106F | YANKTON | SD |
| 2021-02-14 | 605-857-4XXX | 4000–4999 | Assigned | ONVOY, LLC - SD | 162G | YANKTON | SD |
| 2018-06-15 | 605-857-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD | 6569 | YANKTON | SD |
| 2021-02-14 | 605-857-6XXX | 6000–6999 | Assigned | ONVOY, LLC - SD | 162G | YANKTON | SD |
| 2017-05-09 | 605-857-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | YANKTON | SD |
| 2013-09-03 | 605-857-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - SD | 5180 | YANKTON | SD |
| — | 605-857-9XXX | 9000–9999 | Reserved | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | YANKTON | SD |
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.