What are the Private IP Addresses

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Question

There are several internet IP Addresses that have been allocated for use by any company internally. By using these addresses, you can guarantee that no communication between machines using these IP addresses and the internet
in general can be achieved. All communications must go through (a) some software that does address translation; or (b) a server (like NTMail/GLWebMail). By using NTMail/GLWebMail in this way you can control the access to the Internet by users.

What are the IP addresses?

Answer

The Private Address Space as defined by the Internet Assigned Numbers Authority (IANA) is the following:

Class A:   10.0.0.0        -   10.255.255.255
Class B:   172.16.0.0      -   172.31.255.255
Class C:   192.168.0.0     -   192.168.255.255

IANA has assigned a single Class A network, 16 Class B networks and 255 Class C networks.

Full details can be found in RFC1918.

Keywords:Private, IP Addresses, Local, Internal, Client, Security, Control, Proxy

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