| Tail Number / N-Number | N657MB |
| Manufacturer | BURWELL MICHAEL B |
| Model | C4 |
| Manufacturer's Serial Number | C04010293 |
| Aircraft Type | Fixed wing single engine |
| Category | Land |
| Builder Certification | Not Type Certificated |
| Number of Seats | 2 seats |
| Weight Class | CLASS 1 (Up to 12,499 pounds gross take off weight) |
| Number of Engines | 1 engine |
| Kit Manufacturer | SKYSTAR ACFT CO |
| Kit Model | KITFOX CLASSIC IV |
| Type of Registrant | Individual |
| Owner Name | BUTTNER THOMAS |
| Street | 1615 GRAND ST APT A |
| City | ALAMEDA |
| State | CA |
| Zip Code | 94501-2521 |
| Region | Western-Pacific |
| County | Alameda County |
| Country | US |
| Fractional Ownership | No |
| Certificate Issue Date | 2020-07-09 |
| Last Action Date | 2022-11-11 |
| Expiration Date | 2027-07-31 |
| Status | Valid Registration |
| Mode S Code | 52123720 |
| Mode S Code Hex | A8A7D0 |