Use the Server Status tool to check if any of your websites are offline.

SEO Tools:

• Rank Checker
• Google PageRank
• PageRank Prediction
• Multi-Rank Checker
• Link Popularity
• Backlink Checker
• Keyword Suggestion
• Spider View

Domain Checks:

• Domain Availability
• Domain Whois
• Reverse IP/Look-up
• Server Status
• Website Speed Test
• Ping