The government has issued instructions that all Indian passports with serial numbers Z-000001 to Z-045925 are to be recalled and new passports issued in their place

If your passport is of Z series. (Passport number starts with Z). If your passport is in the serial number from Z000001 to Z073000
You need to submit your Passport to the Passport office for the cancellation.
For this following procedure need to be undertaken:

Log on to www.passport.gov.in
Fill up online form
Submit your original passport along with online filled up form and address proof

This news is from Times of India.

http://timesofindia.indiatimes.com/Government_withdraws_46000_Z-series_passports/articleshow/3007718.cms

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