An IP address
(Internet Protocol address) is a unique address used to identify a computer and communicate with other computers. There are two types of addresses employed on the Internet...Public and Private IP addresses. A Public IP address
is assigned by your Internet Service Provider (ISP) and is your public identifier on the web. A public IP address is assigned to a computing device to allow direct access over the Internet...it is globally unique and can only be assigned to an unique device. A Private IP address
is assigned by your router, which allows identification within the constraints of your local area. A private address is allocated by InterNIC to allow organizations to create their own private network.
Computers can use static
IP addresses. A static IP address is a number assigned to a computer by an Internet service provider (ISP) and intended to be its permanent
(fixed) address on the Internet, thus, it will not change
. A dynamic IP address uses Dynamic Host Configuration Protocol (DHCP)
to obtain an IP address and might change when you get a new lease. Since there are not enough IP numbers for each computer, many ISPs and DHCP Servers limit the number of static IP addresses they assign by utilizing a pool of IP addresses
instead. The ISP will temporarily assign a dynamic IP address automatically to a requesting DHCP
computer from this pool of addresses and it will change each time you connect
to the Internet. When you disconnect from the Internet, the temporary dynamic IP address is returned to the IP address pool so it can be assigned to someone else. When you reconnect, you are then assigned a different dynamic IP address from those available in the pool.
If the IP address is received via DHCP, it is almost always a Private IP address with ranges as follows.
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255
If not, then it is a Public IP address.
If you don't know whether your IP address is static or dynamic, then it is probably dynamic.What is the difference between public and private IP addresses?Private and Public IP Addresses: What’s the Difference?What is the difference between public and private IP address?What is a Private IP Address? An explanation for the novice user