title: Hex 3 character to 2 character conversion
body: <p>Looking at a wireshark preview of some hex.</p>
  <p>I see 32 35 36. It previews it as 256.</p>
  <p>I thought the hex representation of 256 is 100. However the hex preview in wireshark is only two characters 1b 01 etc.</p>
  <p>How is 256 encoded as 32 35 36? Where does the 3 come from? In javascript how would you represent a number such as 256 as a hex value encoded with a series of 2 characters?</p>