See also Dynamic vs Static IP Addresses
What is an static IP address?
Static IP address
assignment (sometimes also called fixed IP addressing
) is an alternative to dynamic addressing on Internet Protocol networks.
Dynamic addressing is convenient. It also allows mobile computers to more easily move between different networks.
As usualy only servers/hostnames and some users have static IP address in Internet
How to know static or dynamic IP address in my computer? (do i know have i a static ip address?)
If this 3 conditions is true for you case, then 98% that your IP is static.
|Natural properties of static IP addresses:|
A static IP address best supports name resolution, so that a computer can be most reliably reached over the network by its host / domain name.
Web and FTP servers in particular benefit from fixed addressing for this reason.|
Using static IP addresses on home networks gives somewhat better protection against network security problems than does DHCP address assignment.
Some network devices do not support DHCP. Using static IP address assignment for all devices on the home network guarantees to avoid potential address
conflicts where DHCP may supply an address already assigned statically elsewhere.
Uses of static addressing
Some infrastructure situations have to use static addressing, such as when finding the Domain Name Service directory host that will translate domain names to IP addresses.
Static addresses are also convenient, but not absolutely necessary, to locate servers inside an enterprise.
An address obtained from a DNS server comes with a time to live, or caching time, after which it should be looked up to confirm that it has not changed.
Even static IP addresses
do change as a result of network administration.
A static IP address is a number (in the form of a dotted quad) that is assigned to a computer by an Internet service provider (ISP)
to be its permanent address on the Internet.
Computers use IP addresses to locate and talk to each other on the Internet, much the same way people use phone numbers to locate and talk to one another on the telephone.