NumberResearchThousands-blocks in 618-921
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 618-921 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 618 blocks
Most active assignees, all time — NPA 618
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-05-11 | 618-921-0XXX | 0000–0999 | Assigned | TERRA NOVA TELECOM INC. | 145J | METROPOLIS | IL |
| 2003-02-13 | 618-921-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | METROPOLIS | IL |
| 2021-02-02 | 618-921-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | METROPOLIS | IL |
| — | 618-921-3XXX | 3000–3999 | Available | METROPOLIS | IL | ||
| — | 618-921-4XXX | 4000–4999 | Available | METROPOLIS | IL | ||
| — | 618-921-5XXX | 5000–5999 | Available | METROPOLIS | IL | ||
| 2017-10-04 | 618-921-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - IL | 7136 | METROPOLIS | IL |
| — | 618-921-7XXX | 7000–7999 | Available | METROPOLIS | IL | ||
| 2008-11-17 | 618-921-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | METROPOLIS | IL |
| 2024-02-01 | 618-921-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | METROPOLIS | IL |
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.