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You cannot verify a passport number. But the local police and the embassy / consulate of the country that issued the passport are normally able to do so. Most issuing authorities keep lists of cancelled passports. The Interpol also has such a list to which your local police may have access. Views.
The question you are asking is totally unofficial. If you are working in PSK office or other related department only, u can identify whether the passport number is original or fake on officially. If you are a normal people in the case, there is no way to find out the passport number is original or fake. okay. Thanks & Regards, Shiva RJ.