Here are the basic search filters you can use:
city: find devices in a particular citycountry: find devices in a particular countrygeo: you can pass it coordinateshostname: find values that match the hostnamenet: search based on an IP or /x CIDRos: search based on operating systemport: find particular ports that are openbefore/after: find results within a timeframe
Find Apache servers in San Francisco:
apache city:"San Francisco"
Find Nginx servers in Germany:
nginx country:"DE"
Find GWS (Google Web Server) servers:
"Server: gws" hostname:"google"
Find Cisco devices on a particular subnet:
cisco net:"216.219.143.0/24"