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Difference Between IPv4 and IPv6 Addresses

Internet Protocol addresses (IP addresses) are essential to the transmission of data from one device to another, connected by a network. Every computer/electronic device communicating with another server, computer or device, must have an IP address to identify itself.

Version 4 of the Internet Protocol (IPv4) was the first version implemented and utilised for public use, which is currently set to be replaced by IPv6. They function similarly, but independently of each other. Network transmissions cannot switch between IPv4 and IPv6 in route to their destination and the address notation also differs:

Example IPv4 Address Example IPv6 Address
123.123.123.123 1234:5678:90ab:cdef:1234:5678:90ab:cdef

1&1 is currently using IPv4 and IPv6 addresses, allowing customers to use one or the other. Additional IPv4 addresses are still available to sever customers for a charge whereas additional IPv6 addresses are available free-of-cost to our server customers.