I would describe your cat as a brown spotted tabby and white domestic shorthair. He is very handsome! Most cats are not any specific breed.
Many domestic shorthairs have a spotted tabby pattern, so it's common for people to be curious if their cats have Egyptian Mau ancestry. However, genuine Egyptian Maus are quite rare, and breeders keep track of where their kittens go. Egyptian Maus have a slender body and different head type from your cat, and do not have white markings.