All computers connected to internet have a unique IP address. Generally IP address is dynamic in nature and changes when you restart you system or your modem (Disconnect - connect). Static IP address is necessary when you want to recognize your system by a unique IP address same all the time. Static IP addressing is for one customer on one IP address and Dynamic IP addressing assigns a different IP address each time the ISP customer logs on to their computer, but this is dependent upon the Internet Service Provider (ISP) because some ISP's only change the IP address as they deem it necessary.
If you have Dynamic IP Addressing through your Website Host it means that you are sharing an IP Address with several other customers.
If you are a beginner on the internet, an avid internet user, are entertaining the thought of starting your own website business, are a gamer, use VOIP or VPN there are several things you should know about IP Addressing.
Static IP Addressing
If you feel the need to always know what your IP address is then you need a Static IP address, because it is constant. Static IP addresses are more reliable for Voice over Internet Protocol (VOIP), more reliable to host a gaming website or to play X-Box, Play Station, use Virtual Private Network for secure access to files from your company network computer, etc. Another plus with Static IP's, when hosting a website you are not sharing your IP with another company who sends out a lot of E-mail SPAM and not only has their website been shut down but in turn gets your IP address blacklisted.
Dynamic IP Addressing
Dynamic addressing is usually used by ISP's so that one IP address can be assigned to several users, however some ISP's use Sticky Dynamic IP Addressing and do not change the IP address very often. Dynamic IP Addressing can be used by families with several computers or by a small business owner who has a home office. The software that comes with a router allows for Dynamic Host Configuration Protocol (DHCP) setup and assigns each computer attached to the router an IP address automatically.
In contrast, Dynamic IP addressing should not be used for VOIP, VPN, playing online games or game hosting, running a serious business, because Dynamic IP addressing is less reliable then Static IP addressing and could cause the service to disconnect while you are on a VOIP, VPN or gaming.
Also, Less downtime – Each time your IP address refreshes you run the risk of downtime. While this is usually only for a very short time, it can wreak havoc on your gaming VoIP or business accounts. Having a static address eliminates this risk.
Remote access – With a static IP address you can access your PC no matter where you are in the world. Using programs such as Remote Administrator and PC Anywhere you can log into your work or home PC no matter where you are. Although you can set the connection up regardless of what type of IP address you have, you need a fixed address to maintain it otherwise the program will no longer be able to find your computer when your PC refreshes its dynamic address. There are work arounds, but not as stable as a Static IP address.