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shameless plug, I made an ipcalc6 in rust that does it (with colors)

user@box:~/Documents/code/rust/ipcalc6$ cargo run 2600:1ff2:4000::/40

    Finished dev [unoptimized + debuginfo] target(s) in 0.01s

     Running `target/debug/ipcalc6 '2600:1ff2:4000::/40'`

WARNING : netmask /40 is smaller than /48, this is unusual if ip of type : Global Unicast Address and Link-Local Address

Type: Unicast Global

Address: 2600:1ff2:4000:0000:0000:0000:0000:0000

NetMask: 40

Hosts/Net: 19342813113834066795298816

Address: 0010011000000000.0001111111110010.0100000000000000.0000000000000000.0000000000000000.0000000000000000.0000000000000000.0000000000000000

NetMask: 1111111111111111.1111111111111111.1111111111111111.0000000000000000.0000000000000000.0000000000000000.0000000000000000.0000000000000000

HostMin: 0010011000000000.0001111111110010.0100000000000000.0000000000000000.0000000000000000.0000000000000000.0000000000000000.0000000000000000

HostMax: 0010011000000000.0001111111110010.0100000000000000.1111111111111111.1111111111111111.1111111111111111.1111111111111111.1111111111111111