No tutorial needed.. Search terms are important.
1. register account on shodan
2. search for:
Ftp servers
port:21 country:us asus -530 (or whatever country you want)
port:21 asus 230
230 asus port:21country:us (or whatever country you want)
Netgear country:US 230 (or whatever country you want)
Seagate country:US 230 (or whatever country you want)
Http "iomega" or "logitech" servers
iomega port:"443"
iomega port:"80"
"Set-Cookie: iomega="
" Set-Cookie: iomega= " country:us (or whatever country you want)
Logitech port:"9002"
Logitech port:"9000"
Sometimes after hours of searching find nothing...patience and just patience
Happy hunting.