NumberResearchThousands-blocks in 567-231
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 567-231 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 567 blocks
Most active assignees, all time — NPA 567
New assignments by month
Sep 2026
Aug 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 567-231-0XXX | 0000–0999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - OH | 4863 | CHESTERVL | OH |
| 2013-09-17 | 567-231-1XXX | 1000–1999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CHESTERVL | OH |
| 2021-09-07 | 567-231-2XXX | 2000–2999 | Assigned | ONVOY, LLC - OH | 464C | CHESTERVL | OH |
| 2011-08-08 | 567-231-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 6025 | CHESTERVL | OH |
| 2005-02-08 | 567-231-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - OH | 4863 | CHESTERVL | OH |
| 2014-04-24 | 567-231-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - OH | 001F | CHESTERVL | OH |
| 2008-05-09 | 567-231-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 6025 | CHESTERVL | OH |
| 2007-03-07 | 567-231-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 6025 | CHESTERVL | OH |
| 2006-12-06 | 567-231-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 6025 | CHESTERVL | OH |
| 2006-10-10 | 567-231-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 6025 | CHESTERVL | OH |
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.