As stated, Thailand has around 23.9 million active Internet users, which represents about 37% of the population who regularly connect to the web.
In terms of comparing the amount of Internet users in Thailand to other countries, whilst Thailand has seen rapid growth in 2014, it still ranks pretty poorly in terms of Internet penetration.
Thailand which stands at around 37% Internet penetration is well behind Singapore which has 81% penetration (perhaps not all that surprising) and behind Malaysia which has 66% Internet penetration.
However, Thailand is also behind the Philippines and Vietnam each of which have Internet penetration levels of around 44%.