Using Lookup, Ping, and Traceroute to work out why you can’t connect to a website. Is your ISP blocking it, perhaps?
name service
You may think that you type URLs into your browser. In fact they’re IRIs, and the internet still can’t cope with Unicode. Why not?
Can I speed up my browsing by running my own Name Server?
What is the network address of your Mac? Is that its MAC, IPv4, or IPv6 address, how is each assigned, and how do they relate to one another?
What can I do to deal with the threat to Internet name servers?
The Eclectic Light Company 