SenderBase allows you to search for data on almost any IP address sending email on the Internet as well as the domains and network owners that control the servers. Here are examples of the searches SenderBase supports:

• IP address: "206.16.1.160"
• CIDR range: "206.16.1.0/24"
• Domains: "cnet.com"
• Network Owner: "CNET Networks Inc."
• Wildcard: "CNET" (returns all organizations starting with the letters CNET)