I honestly wish there was - it would certainly make my work life an awful lot easier. I've mentioned before on here that I work in admissions and recruitment at a university. Any university I've come across that even remotely deals with international students, will have entire teams of people dedicated to things like entry requirements, visas, immigration status of students/academics etc. It would amaze you how something so simple can snowball into a complex mess of ever changing rules and regulations based on something that from the outset seems like an insignificant detail. There really isn't a simple solution that has the utility to cover even a sizable minority of people. I blame politicians

I do believe if the rules were more straightforward, then the likes of airlines, universities, businesses, even governments would have systems already set up to make it easy for people to work out if they are able to enter a country, stay, study etc. They have every incentive to do so - the punishment for getting it wrong is severe both to the finances and corporate image. Alas, it is not. Hence the unfortunate situation that has happened. It is a lamentable fact that this situation will have happened to a few people today and will happen again tomorrow and so on.

People have already quoted links to places that can help others if they are unsure of a country's entry requirements. However, as you'll see when you read them, even they don't have all the answers. I'll leave this little snippet from the gov.uk website for the entry requirements to India: "The guidelines regarding passport validity on arrival in India are unclear. To avoid possible problems at immigration, make sure your passport is valid for a minimum of 180 days at the time of entry into India." LOL.