To integrate Shodan sub-domain retrieval into Sn1per, edit your /root/.sniper.conf file and enable the Shodan plugin by changing the value to "1":

SHODAN="1"

Next, add your Shodan API key to your /root/.sniper_api_keys.conf file:

# SHODAN API KEY
SHODAN_API_KEY=""

Note: This only works under "recon" mode scans (ie. -re switch):

sniper -t example.com -re -w example.com