Shodan Cheat Sheet
Here are the basic search filters you can use:
city: find devices in a particular city
country: find devices in a particular country
geo: you can pass it coordinates
hostname: find values that match the hostname
net: search based on an IP or /x CIDR
os: search based on operating system
port: find particular ports that are open
before/after: find results within a timeframe
Find Apache servers in San Francisco:
apache city:"San Francisco"
Find Nginx servers in Germany:
Find GWS (Google Web Server) servers:
"Server: gws" hostname:"google"
Find Cisco devices on a particular subnet: