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The public IP addresses are not statically allocated to a computer but are leased dynamically by a DHCP server which sits somewhere in the network managing allocation of IP addresses.When a lease runs out the computer makes another DHCP request which typically extends the lease for same IP address. However if the IP address was allocated to someone  else in the meantime then a new DHCP address is offered.

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mo7ammedfarooq asked Jan 23
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when i know the ip address in classfull adress i can directly send a message right why to identfy the network id of that and mac address of that ip