The currently used Internet Protocol version 4 (IPv4) manages about four billion addresses and has reached its limit, experts said.

专家称，目前使用的网络协议IPv 4管理的约40亿个互联网地址，已经达到它的上限。

youdao

Internet Protocol version 4 (IPv4) will not be able to cope with the growing popularity of smartphones, IPTV, and other gadgets connecting to the Internet.

Internet Protocol version 4 (IPv4)无法适应不断增长的智能手机、IPTV和其他连接Internet的gadget。

youdao

The internet was built on version 4 of the Internet Protocol (IPv4) which has an upper limit of about four billion addresses.

BBC: Net approaches address exhaustion