SHODAN is basically a search engine for nmap scans of the internet. Right now it’s primarily covering Web servers, FTP server, SSH servers, and Telnet servers. That’s ports 21, 22, 23, and 80, respectively.
You can also narrow down the results using the following search parameters:
- country:2-letter country code
- hostname:full or partial host name
- net:IP range using CIDR notation (ex: 220.127.116.11/24 )
- port:21, 22, 23 or 80
I imagine this thing will get huge once it takes off….