Forget India, Ireland (right beside the UK) has no postcodes.
Even within the UK (Fermanagh) postcode usage can be spotty.
I navigated more by "When you're past the ornately carved and colourful chapel go straight on and do a right, turn left when you see the blue building, we're in the red one third down with the blue door.".
Some places have such details, but a lot of the towns and villages just added roads organically and wouldn't stop to centrally register them, name them, number them, assign them identifiers, etc.