NumberResearchThousands-blocks in 574-891
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 574-891 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 574 blocks
Most active assignees, all time — NPA 574
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-05-21 | 574-891-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - IN | 105F | DUNLAP | IN |
| 2020-05-29 | 574-891-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | DUNLAP | IN |
| — | 574-891-2XXX | 2000–2999 | Reserved | FRONTIER NORTH, INC.. - IN | 0772 | DUNLAP | IN |
| 2011-04-29 | 574-891-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN | 7440 | DUNLAP | IN |
| 2015-02-05 | 574-891-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | DUNLAP | IN |
| 2019-07-09 | 574-891-5XXX | 5000–5999 | Assigned | ONVOY, LLC - IN | 097D | DUNLAP | IN |
| 2012-03-16 | 574-891-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IN | 7314 | DUNLAP | IN |
| 2014-03-25 | 574-891-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | DUNLAP | IN |
| 2018-09-18 | 574-891-8XXX | 8000–8999 | Assigned | ONVOY, LLC - IN | 097D | DUNLAP | IN |
| 2019-07-09 | 574-891-9XXX | 9000–9999 | Assigned | ONVOY, LLC - IN | 097D | DUNLAP | IN |
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.