NumberResearchThousands-blocks in 309-243
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 309-243 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 309 blocks
Most active assignees, all time — NPA 309
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 |
|---|---|---|---|---|---|---|---|
| 2020-04-22 | 309-243-0XXX | 0000–0999 | Assigned | ONVOY, LLC | 224C | DUNLAP | IL |
| — | 309-243-1XXX | 1000–1999 | Reserved | FRONTIER NORTH, INC. - IL | 1015 | DUNLAP | IL |
| — | 309-243-2XXX | 2000–2999 | Reserved | FRONTIER NORTH, INC. - IL | 1015 | DUNLAP | IL |
| 2004-04-30 | 309-243-3XXX | 3000–3999 | Assigned | FRONTIER NORTH, INC. - IL | 1015 | DUNLAP | IL |
| 2018-07-03 | 309-243-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | DUNLAP | IL |
| — | 309-243-5XXX | 5000–5999 | Reserved | FRONTIER NORTH, INC. - IL | 1015 | DUNLAP | IL |
| 2017-04-05 | 309-243-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | DUNLAP | IL |
| — | 309-243-7XXX | 7000–7999 | Reserved | FRONTIER NORTH, INC. - IL | 1015 | DUNLAP | IL |
| — | 309-243-8XXX | 8000–8999 | Reserved | FRONTIER NORTH, INC. - IL | 1015 | DUNLAP | IL |
| — | 309-243-9XXX | 9000–9999 | Reserved | FRONTIER NORTH, INC. - IL | 1015 | DUNLAP | IL |
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.