You need to use the search button more often....
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Uses of dynamic addressing
Dynamic IP addresses are most frequently assigned on LANs and broadband networks by Dynamic
Host Configuration Protocol (DHCP) servers. They are used because it avoids the administrative
burden of assigning specific static addresses to each device on a network. It also allows many
devices to share limited address space on a network if only some of them will be online at a particular
time. In most current desktop operating systems, dynamic IP configuration is enabled by default so
that a user does not need to manually enter any settings to connect to a network with a DHCP
server. DHCP is not the only technology used to assign dynamic IP addresses. Dialup and some
broadband networks use dynamic address features of the Point-to-Point Protocol.
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Sticky dynamic IP address
A sticky dynamic IP address is an informal term used by cable and DSL Internet access subscribers to
describe a dynamically assigned IP address that seldom changes. The addresses are usually assigned
with the DHCP protocol. Since the modems are usually powered-on for extended periods of time, the
address leases are usually set to long periods and simply renewed upon expiration. If a modem is
turned off and powered up again before the next expiration of the address lease, it will most likely
receive the same IP address.
As i know it, you cant make a public server with a dynamic IP address...
Need help
. If you could shed some light on it that would be great 
