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Every time a computer reboots it asks the router for an IP address.The router then hands the computer an IP address that has not already been handed out to another computer.The IPv6 protocol followed IPv4 and provided for 128-bit addressing for virtually unlimited IP addresses.
A static IP address is also known as a fixed address.
This means that a computer with an assigned static IP address uses the same IP address when connecting to the Internet. The ISP assigns each address to its networked computers via the Dynamic Host Configuration Protocol (DHCP) server, which is configured to allocate static IP addresses to specific computers.
But after restarting your computer it may use a different IP address.
When this happens the ports are no longer forwarded to that computer's IP address.
Your router most likely assigns dynamic IP addresses by default.
Routers do this because having a dynamic IP address network requires no configuration on your part.Even then, ISPs approached static addressing conservatively by limiting static addresses to unused IP addresses to facilitate temporary IP, or dynamic IP, addressing to requesting DHCP servers.With the rapidly expanding use of IP-addressable devices, IPv4's limitations became more apparent.You can also view this information from your router’s DHCP server settings, which can be foundby accessing its setup/configuration page.For the Preferred DNS server and Alternate DNS server fields, you can take a look for the exact DNS values that your router is getting from your ISP, which can be usually found by accessing your router’s configuration page.IP addresses are four sets of numbers that are separated by periods that allow computers to identify each other.Every computer on your network has at least one ip address.One way of organizing your home network is by assigning each of your networked computers with a static IP address instead of using DHCP.With DHCP (Dynamic Host Configuration Protocol), each computers and devices will have to request for an IP address everytime it’s booted up.The addresses are used for network identification and communication. Unlimited IP address requirements were not considered when the Internet was first conceptualized.At that time, Internet Protocol version 4, based on 32-bit addressing (IPv4) allowed for 4.2 billion unique addresses.