There are numerous ways to obtain information about a dynamic IP address. The most common method is probably to visit a site on the Internet that is displaying information about the IP in the web browser. Ghacks for example has a small IP Lookup script for that purpose. There are also other ways of obtaining the dynamic IP address. One is by running the lightweight portable software program IP2. IP2 is compatible with most Microsoft operating systems.
The program will display its basic interface upon execution that is showing four blank rows. The first two rows display the local area network (LAN) IP and computer name while the two other rows display the IP assigned by the Internet Service Provider and the hostname.
The user has to click on the Find my IP addresses button to start the lookup. IP2 will query one of several IP lookup services on the Internet to display the information in the second row. Each entry can be easily copied to the clipboard by clicking on the Copy button next to each row.
The developer lists the services that are used to lookup the external IP address on the website. IP2 can be downloaded from that website as well. The program has a tiny size of only 8 Kilobytes.
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I think it it easier to use online checks that have separate utility around. There is such thing as too much utilities in folder. :)