Returns the address in expanded format with all zeros included, like 2001:0db8:0008:0066:0000:0000:0000:0001.
2001:0db8:0008:0066:0000:0000:0000:0001
Returns the address in expanded format with all zeros included, like
2001:0db8:0008:0066:0000:0000:0000:0001.