Internet Protocol version 6
has a 128-bit address space, which is 340 undecillion addresses. An
IPv6 address looks like this: 2001:0db8::53. Where there are two colons
side by side, all the segments in between contain only zeros. So without
the double colons, you would expand the example address to 200
1:0db8:0000:0000:0000:0000:0000:0053.
