NumberResearchThousands-blocks in 517-446
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 517-446 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 517 blocks
Most active assignees, all time — NPA 517
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2013-12-10 | 517-446-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF MICHIGAN, LLC - MI | 933G | ONSTED | MI |
| — | 517-446-1XXX | 1000–1999 | Reserved | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | ONSTED | MI |
| — | 517-446-2XXX | 2000–2999 | Reserved | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | ONSTED | MI |
| — | 517-446-3XXX | 3000–3999 | Reserved | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | ONSTED | MI |
| 2012-05-31 | 517-446-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | ONSTED | MI |
| 2016-02-23 | 517-446-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 770E | ONSTED | MI |
| 2018-09-13 | 517-446-6XXX | 6000–6999 | Assigned | ONVOY, LLCV - MI | 543C | ONSTED | MI |
| 2017-10-26 | 517-446-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | ONSTED | MI |
| 2020-02-19 | 517-446-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF MICHIGAN, LLC - MI | 933G | ONSTED | MI |
| — | 517-446-9XXX | 9000–9999 | Reserved | DEERFIELD FARMERS' TELEPHONE COMPANY - MI | 558A | ONSTED | 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.