Here is a list of few reserved IP addresses and their functions:
| Addresses | Functions |
| Network addresses of all 0s | Interpreted to mean "this network or segment" |
| Network addresses of all 1s | Interpreted to mean this all networks |
| Network 127.0.0.1 | Reserved for loopback tests. Designate the local node and allows that node to send a test packet to itself without generating network traffic. |
| Node addresses of all 0s | Interpreted to mean "network address" or any host on a specified network. |
| Node addresses of all 1s | Interpreted to mean all nodes on specified network; for example, 172.8.255.255 means all nodes on network 172.8 (class B address) |
| Entire IP address set to all 0s | Used by Cisco routers to designate default route. Could also mean any network |
| Entire IP address set to all 1s (same as 255.255.255.255) | Broadcast to all nodes on the current netwrok; sometimes called local broadcast |
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