IP addresses

[johnah]

How do I decode an IP address such as 80.7.1.110

[mattie]

I am not really sure what you mean by decode, but 80.7.1.110 is a class A IP address, Class A 0-126, Class B 128-191, Class C 192-223. The first part (80) is the network ID and the rest is the host ID. Class A addresses are used by large companies e.g ISP's and Governments and allow over 16 million hosts. A host is something connected to the network that uses an IP address, either a PC or a network printer. You can also identify a class of address by its subnet mask, Class A would be 255.0.0.0. If you want to convert it to binary, do as follows : 128 64 32 16 8 4 2 1 0 1 0 1 0 0 0 0 = 80 0 0 0 0 0 1 1 1 = 7 0 0 0 0 0 0 0 1 = 1 0 1 1 0 1 1 1 0 = 110 hope this helps

[mattie]

Apologies, that binary calculation did not come as I had typed it, place a comma between the 1 and first zero of the first string of numbers and it should be clearer.

[moonacre]

Do you mean resolve the IP address to a domain name?

This is called a IP Whois lookup and there are several sites which offer this as a service such as http://stat.lookanswer.com/whois/ip-index.jsp

[johnah]

Thanks Mattie & Moonacre. I get a regular ping from 80.7.1.110 & I want to know who they are. I should now be able to find out.