Shodan (https://www.shodan.io) Is A Search Engine Launched In 2009 That Allows Users To Find Specific Types Of Devices Connected To The Internet Such As Computers, Routers, Firewalls And IoT Devices. The Website Is Available 24/7.
Shodan Was Founded By John Matherly As A Tool For Network Security Researchers To Find Vulnerable Devices. Over The Years It Has Expanded Beyond Security To Give Insight Into The Modern Internet Of Things. Shodan Crawls The Internet Continuously Looking For Publicly Accessible Devices That Reply To Internet Control Message Protocol (ICMP) Echo Requests Or TCP SYN Packets On Their IP Addresses.
Categories On Shodan Include Industrial Control Systems, Webcams, Medical Devices And More. Saving Tips Include Setting Custom Filters To Track Specific IPs, Using The Chrome Plugin For Quick Searches And Bulk Downloads For Large Datasets. Keywords Relevant To Shodan Are Internet Of Things, Device Discovery, Network Monitoring, API, Vulnerability Research And Internet Intelligence.
Shodan Offers Free Membership With Limited Search Queries And Paid Plans Starting At $30/month Including Dedicated Access, Bulk Data Downloads And API Keys. Coupon Codes May Be Available For Discounts On Memberships.
To Search Shodan, Enter Search Terms In The Search Bar Like Keywords, IP Addresses Or Ports. Advanced Searches Allow Filtering By Location, Operating System, Tags And More.
Shodan Has Indexed Billions Of Devices Including Routers, Firewalls, Webcams, Printers, Media Devices, Industrial Controls And Internet Of Things Appliances.
Shodan Itself Is Safe As It Only Provides Information On Internet-connected Devices. However, Some Findings Could Involve Unpatched Vulnerabilities, So Caution Is Advised When Interacting With Found Systems.
Shodan Crawls The Internet Continuously But Some Devices May Be Missed Or No Longer Accessible. Owners Can Also Request Removal Of Private IP Blocks From The Index.
Paid Plans Provide More Search Queries, Access To Historical Data, API Keys For Integrations And Tools Like Network Monitoring And Bulk Data Downloading.