IPv6 addressing

IPv6 subnet calculator

Calculate network boundaries for IPv6 prefixes. Looking for the IPv4 calculator?

Common prefix reference

CIDRTypical useTotal addresses
/128Single host / loopback route1
/127Point-to-point link (RFC 6164)2
/64Standard LAN subnet18,446,744,073,709,551,616
/56Common site delegation4,722,366,482,869,645,213,696
/48Common site allocation1,208,925,819,614,629,174,706,176
/32Common ISP/RIR allocation79,228,162,514,264,337,593,543,950,336