Denmark does not use city or area codes, it just has eight-digit telephone numbers. From outside Denmark, prefix the country code +45
Leichtenstein is telephone country code +423.
where is telephone country code 1816
There is no area code +1 453 in North America. International country code +45 is Denmark.
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.