How this tool works
IPv6 addresses contain 128 bits. The double-colon abbreviation may appear only once; an IPv4-mapped suffix is also supported.
Worked example
2001:0db8:0000:0000:0000:0000:0000:0001 compresses to 2001:db8::1.
Always verify outputs before changing production systems. These tools are for learning, planning, and troubleshooting.