Dynamic IP address

Your IP address is assigned to you by your Internet service provider (ISP). Two types of IP addresses can be issued to you: Static IP or Dynamic IP. As their naming suggests, Static IP addresses remain the same whereas Dynamic IP addresses constantly change.

Dynamic IP Addresses – Static IP vs Dynamic IP

When a device is assigned with a dynamic IP address, each time the device is rebooted, the ISP dynamically assigns the IP address to this network device using Dynamic Host Configuration Protocol (DHCP) protocol. The DHCP generally reassigns the same IP address to same machine, but it is not guaranteed that your device receive the same IP address previous assigned to it. Moreover even if your machine is always on and permanently connected, some ISPs do change IP address on-the-fly even but this is very rare. Most devices that for example just browsing the Internet  use dynamic IP addresses.

Similarly with static IPs, dynamic IP addresses have their pros and cons.

Dynamic IP address advantages

  • Cost: the allocation of IP address and network configuration are done much faster thus cheaper
  • Maintenance, scaling: all the network devices get IP address automatically from the DHCP server. This makes adding new devices to the network much easier. Regardless of the size of the network, dynamic IP is really useful as it is easy to allocate, distribute and manage. No need to configure every device manually.
  • Security: As the IP might change over time, it can provide more privacy.

Dynamic IP address disadvantages

  • It is not suited to web hosting. The IP address need to be checked constantly, as it changes always.
  • A DHCP server is needed and configured to obtain the dynamic IP address.

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