Telephone country codes never begin with zero.
Country code +994, dialed as 00 994 from many places, is Azerbaijan.
Country code +94, dialed as 009 94 from many places, is Sri Lanka.
To avoid confusion, it is best to write an international telephone number in correct international format, beginning with the plus symbol and the correct telephone country code (e.g., +994 or +94), omitting any dialing prefix.
(The plus signmeans "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Country code +94 (dialed as 00 94 from many places) is Sri Lanka. Note that you must drop the trunk prefix 0 from the beginning of the Sri Lankan number when calling internationally. For example, Colombo's area code 011 becomes +94 11. Mobilenumbers begin with +94 7.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
0094
There is no such thing as a "country zip code." Zip codes are postal codes for "snail mail" in the United States or in the Philippines. Each zip code is for a town or a part of a city. There is no such thing as a zip code or postal code for a whole country. Telephone country code +994, dialed as 00 994 from many places, is Azerbaijan. However, dialing 00994 from some countries will reach a place other than Azerbaijan, such as Sri Lanka.
Leichtenstein is telephone country code +423.
where is telephone country code 1816
That is not a country code.
There is no 909 country code.
There is no telephone country code +897, nor +89, nor any other country code beginning with +89. There are no valid telephone numbers beginning with +89.
Gibraltar is country code +350.
Moldova is country code +373.
Slovenia is country code +386.
Togo is country code +228.
Liberia is country code +231.
Angola is country code +244.