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

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Finding IP addresses

Where does this topic fit?

• Internet concepts– Applications– Technology (communication)– Implications

• Internet skills– Application development– Content creation– User skills

Internet hosts

155.135.55.165www.csudh.edu

IP addresses and domain names

65.55.12.249

www.microsoft.com

65.55.12.249 = www.microsoft.com

Web sites

Commandline

www.ipchecking.com, continued

Reverse lookup

Summary

155.135.55.165www.csudh.edu

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 http://www.google.xom on the Web?

We used www.ipchecking.com 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 www.mit.edu.

Who is responsible for organization technology (OrgTechName) at www.mit.edu?

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 65.55.12.249.

Resources

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

http://www.zoneedit.com/lookup.htmlhttp://www.ipchecking.com