Where do I find my Visa Number on the TDAC form with a Non Imm O Visa?

You don't need to put a Visa number in there if you have a extension of stay

IT IS NOT A MANDATORY FIELD, just leave it blank, no one cares,

On the TDAC website IF there is no asterisks next to the data field, just leave it blank

I didn’t use one today, (did hear that the best number to put down is the no of your re-entry) . just put down Thailand and Phuket as residence. Showed the guy my address on my phone from the email that was sent back to me so have that ready. Departure information don’t come with asterix and not a requirement to pull through your info.

You will find a number similiar to the one below on your latest extension, use that.