Plugin to check coverage

I am looking for a plugin that allows me to enter certain values and that the user can check if a value is between the values that I have previously submitted . More precisely is this:

I have a list of Postal Codes, these codes determine if an area has coverage of our services or do not. The user will see if the area he lives is covered or not. If he has coverage will get a message “You have coverage,” and on the contrary “ You do not have coverage” If someone could give me a hand with this, it would help me a lot! thank you very much everyone!