Work out ipv4 to ipv6 mapping instantly with clear inputs, formula shown and shareable results.
Three transition formats embed an IPv4 address inside an IPv6 address. IPv4-mapped addresses (::ffff:0:0/96) let a dual-stack socket handle both families; 6to4 (2002::/16) derived a /48 from a public IPv4 address for automatic tunnels and is now deprecated; NAT64 with 64:ff9b::/96 is the current way an IPv6-only client reaches IPv4-only servers.
Embedding
split the 32-bit IPv4 value into two 16-bit groups and append them to the transition prefix
NAT64 with the well-known prefix 64:ff9b::/96 paired with DNS64. 6to4 is deprecated and IPv4-mapped addresses are an API convention, not something you route.
Not across the network. It only has meaning inside a host's socket layer, where the stack turns it back into an IPv4 packet.