NumberResearchThousands-blocks in 616-557
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 616-557 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 616 blocks
Most active assignees, all time — NPA 616
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 |
|---|---|---|---|---|---|---|---|
| 2021-05-24 | 616-557-0XXX | 0000–0999 | Assigned | ONVOY SPECTRUM, LLC | 624H | SAND LAKE | MI |
| 2004-08-23 | 616-557-1XXX | 1000–1999 | Assigned | ACD TELECOM, INC. - MI | 3535 | SAND LAKE | MI |
| 2005-05-10 | 616-557-2XXX | 2000–2999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | SAND LAKE | MI |
| 2007-01-17 | 616-557-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | SAND LAKE | MI |
| 2014-06-17 | 616-557-4XXX | 4000–4999 | Assigned | DAYSTARR LLC DBA DAYSTARR COMMUNICATIONS | 993L | SAND LAKE | MI |
| 2011-08-11 | 616-557-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SAND LAKE | MI |
| 2015-07-20 | 616-557-6XXX | 6000–6999 | Assigned | ONVOY, LLCV - MI | 543C | SAND LAKE | MI |
| 2013-02-21 | 616-557-7XXX | 7000–7999 | Assigned | ONVOY, LLCV - MI | 543C | SAND LAKE | MI |
| 2015-08-17 | 616-557-8XXX | 8000–8999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | SAND LAKE | MI |
| 2015-11-30 | 616-557-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF MICHIGAN, LLC - MI | 933G | SAND LAKE | MI |
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.