At your current height and weight, you're not fat (healthy weight, ideal weight based on height, and BMI calculation). As a result, I highly doubt that dieting would help you achieve your goal.
Since you're not fat and you have a belly fat, it's likely as a result of your current lifestyle (unless it's a medical condition).
- Do you sit a lot (especially with bad posture)?
- Do you drink alcohol often?
- Do you walk with bad posture?
- Do you eat heavy dinner (possibly right before sleeping)?
These could be the culprits.
First, clean up your meals. You don't need to diet; just eat balanced meals (containing protein, complex carbs, vegetables, etc) with proper rationing. As the first answer has mentioned, abs are made in the kitchen. Don't eat junk!
Second, you need to exercise more. While it's true that spot reduction is a myth, your body will utilize stored fat wherever it can find it, and given that your overall body has a lower fat percentage, more fat will be taken from your stomach.
Also, in addition to burning off fat, exercises allow your abdominal muscles to be more activated, revealing the much cherished six pack as your belly fat reduces.
If you're really serious about exercises, you'll need some equipment (dumbbells, barbell, etc). That being said, there are plenty of exercises that do not require any equipment.
- Sprinting (or the lighter form, jogging)
- Knee Jumping
- Body weight exercises such as push ups, squats, planks, burpees, etc
All these (and more) require no equipment and are very effective in keeping you fit (and trimming your belly fat).
You can also obtain workout videos to help you. If you do, I recommend trying out P90X's Ab Ripper X video; it's awesome!
Third, clean up your lifestyle.
- If bad posture is the culprit, walking with a good posture (straight back, eyes forward) naturally activates your abdominal muscles.
- If it's sitting a lot, reduce it and endeavor to always sit straight when you do. Also, you can substitute regular chairs with stability balls.
- If alcohol is the culprit, reduce your intake or switch to lower-calorie alcoholic beverages.
- Eat light dinner, especially if/when it's close to bedtime.
I'm certain there are still lots of causes and solutions I might have missed; however, it's more important to start somewhere soonest than trying to obtain all the possible answers before starting.