Skills: finding IP addresses, domain names and organization (whois) information Concepts: host, IP address, domain name, command line interface, graphical.

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Skills: finding IP addresses, domain names and organization (whois) information Concepts: host, IP address, domain name, command line interface, graphical user interface This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License. Finding IP addresses

Where does this topic fit? Internet concepts – Applications – Technology (communication) – Implications Internet skills – Application development – Content creation – User skills

Internet hosts

IP addresses and domain names =

Web sites Command line

continued

Reverse lookup

Summary

Self-study questions Can two hosts have the same domain name? (explain) Can two hosts have the same IP address? (explain) Why do you get an error message when you try to go to on the Web? We used to look up an IP address. What is another service that does the same thing? Use the nslookup command to find the IP address of Who is responsible for organization technology (OrgTechName) at You can also do a reverse lookup, finding the domain name of a host given its IP address? Find the domain name of the host at

Resources A IP lookup sites (forward and reverse lookup and Whois):