I miss my passport 10 years back so iwant passport number

contact the immigration department, explain the circumstances and request a new passport

The number is on your passport. If you've lost your passport then contact the passport issuing agency for your country.

Re instal the system and backup your data before instal the new system.

Things You'll Need

1. Old passport in original with self-attested photocopy of its first four and last four pages, including ECR/ECNR page.
2. If the old passport was issued when you were a minor or did not have the ECNR stamp - provide attested copy of matriculation or degree certificate
3. Proof of address if different than the one on the old passport. Acceptable documents include phone, gas, electricity bill, ration card, spouse or parent's passport copy
4. Recent passport size photographs (Three) in colour showing frontal view of full face are required.

Steps 1 Re-issue vs. Renew
A new passport is re-issued (not renewed) when a current passport (validity of 10 years or more) is 1 year from expiration or it is less than 3 years after it has expired. A passport issued with a validity of 1-5 years under certain emergency conditions can be renewed at no additional cost. This article covers the re-issuance of a Passport that was issued with 10 years or more of validity.
2 The Application Form
The Application Form for re-issuing a Passport is the same as the one required for a new Passport. You can get the Application Form from any Passport Service Center/Office or any Post Office. You can also use the link below.
3 Fees Required
The application fee for reissue of a passport is the same as a new application. Passport for Adult (36 page) - Rs. 1000, Passport for Adult (60 pages) - Rs. 1500 and Passport for a Minor - Rs. 600. It is better to take extra cash with you when submitting the application as there are additional fees for Police Clearance Certificate/ECNR Reqd, etc.
4 Where to Apply
Completed Passport Application Forms with Supporting documents can be submitted at Passport Offices, District Passport Cells/Collector's Office/DSP's Office or at Speed Post Centers. Please be sure to note down the File Reference Number.
5 How to check status of Application
You can check the status of your application online by providing the file reference number at the Consular and Passport Division Website
Tips

• If you have a busy lifestyle and do not wish to waste your time, use a reputed Travel Agent who can get you a passport quickly for a small fee. The travel agent will also be able to verify that your documentation is accurate and sufficient.
• If you have any other questions or situations please use the link below for the official website of the Indian Passport Division.

Caution In case a person has resided at more than 1 place in the past 1 year, then a separate Person Particulars form (part of the Passport Application) needs to be filled out for each address that he has resided at, for the past 1 year.

If it is a UK passport you are asking about, if the number is 9 digits long, then it is likely to be a passport number.
Thumbs Up!

Marie,
There are all the chances that you will get caught for getting a second passport, which is culpable as one person, one passport is the policy in all countries. And also you have not mentioned if you traveled abroad on the old one. If yes, then all the more reason that you must have it.
I would recommend that you ask the passport authorities after telling them the truth. They will, I am sure, help you locate the old records and help you get a new one. Thruth never hurts, but if you try to hoodwink them then in today's computerized world, you will get caught and penalized. Also, a police complaint is required if the lost passport had still not expired.
Wishing you all the very best.

Please get in touch with your nearest passport office/ high commissioner office/ Embassy / police station extension cell/ administrative office. Lodge an FIR with the police station.
You will need to submit necessary document that will be instructed to reissue.

Go to your local post office. They will assist you with your passport. J.

4 thumbs up please.

my name is balamurali i applied for passport 2 months before still i didn't got what hapeend can u pl z expliendme

You can find it out by your name. date of birth and address