what is ip address look up

The currently used IP addresses (IPv4) look like four blocks of digits ranging from 0 to 255 separated by a period like "192.168.0.255".In the new schema (IPv6) addresses can be written in different ways:

2001:2353:0000:0000:0000:0000:1428:57ab
2001:2353:0000:0000:0000::1428:57ab
2001:2353:0:0:0:0:1428:57ab
2001:2353:0::0:1428:57ab
2001:2353::1428:57ab