Today is IPv6 world launch day, as several major companies switched to the new protocol at 00:01 GMT. IPv6 enables trillions of Internet addresses and will eventually replace the current IPv4, which allows for just over four billion unique IPs. Full details at BBC News.
Experts said users should not notice any difference in their web use, and new devices should be using the new system as standard.
Companies such as Google, Facebook and major internet service providers have enabled the new system in order to encourage the widespread adoption of the standard.
The actions come as part of World IPv6 Launch Day, a special event organised by the Internet Society.
IPv6 will eventually replace IPv4, which was conceived during the early days of the internet. It only allows just over four billion unique IP addresses - the sequences of numbers used to identify a device.