There is no area code 163 in North America (USA, Canada, etc.). North American area codes never begin with '1'.
North American telephone numbers are often quoted as, for example, "1-63x-555-0123," where the '1' is the domestic long-distance dialing prefix (coincidentally the same as the telephone country code). Then you would be looking for area code 63x, but you need one more digit.
Leichtenstein is telephone country code +423.
where is telephone country code 1816
That is not a country code.
Country code +57 is Colombia.
Country code 52 is Mexico.
Fiji has telephone country code +679.
Gibraltar is country code +350.
Moldova is country code +373.
Slovenia is country code +386.
Vanuatu is country code +678.
Niue is country code +683.
Togo is country code +228.