IPv$6$ address $192$:$168$:$1$::$0$ is equivalent to

$0192$:$0168$:$0001$:$0000$:$0000$:$0000$:$0000$:$0000$

$0192$:$0168$:$0001$:$0000$

$0000$:$0000$:$0000$:$0000$:$0192$:$0168$:$0001$:$0000$

$0192$:$0168$:$0000$:$0000$:$0000$:$0000$:$0000$:$0001$