NumberResearchThousands-blocks in 574-598
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 574-598 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-10-29 | 574-598-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - IN | 105F | AKRON | IN |
| 2026-02-09 | 574-598-1XXX | 1000–1999 | Assigned | PEERLESS NETWORK OF INDIANA, LLC - IN | 279F | AKRON | IN |
| — | 574-598-2XXX | 2000–2999 | Reserved | RTC COMMUNICATIONS CORP. | 4552 | AKRON | IN |
| 2011-03-10 | 574-598-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | AKRON | IN |
| 2004-06-28 | 574-598-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IN | 4803 | AKRON | IN |
| 2013-07-23 | 574-598-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - IN | 4803 | AKRON | IN |
| 2016-08-19 | 574-598-6XXX | 6000–6999 | Assigned | RTC COMMUNICATIONS CORP. | 4552 | AKRON | IN |
| 2014-06-25 | 574-598-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | AKRON | IN |
| 2016-08-19 | 574-598-8XXX | 8000–8999 | Assigned | RTC COMMUNICATIONS CORP. | 4552 | AKRON | IN |
| 2013-11-07 | 574-598-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF INDIANA, LLC - IN | 279F | AKRON | 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.