Whenever you see something like '9234d87d07ad4a3f', you know that is hex. Whenever you see something like 'Kfj+sS8Absa==', it is a good bet it is base64. Hex

Whenever you see something like '9234d87d07ad4a3f', you know that is hex. Whenever you see something like 'Kfj+sS8Absa==', it is a good bet it is base64. Hex uses 0-9,a-f (16 digits), base64 uses A-Z,a-z,0-9,/,+ (64 digits).