Your IOB Customer ID (CIF) is an 11-digit number. IOB usually recommends checking your passbook first.
- Open your passbook and check the first page
- Look below the account number or account opening date
- Your Customer ID is usually printed there
Tip: If your account or passbook is old, the Customer ID may be written manually with a pen instead of printed.
Alternative options: Check below if you are unable to find it in your passbook.
Check Other Documents to Find Your CIF
If you can’t find it in your passbook, check your other bank documents to retrieve your Customer ID. These methods don’t require any login or internet access.
1. Welcome Letter
Received after partial (half) KYC, usually sent via post or email. Your Customer ID is printed right at the top.
2. Welcome Kit
Given after completing full KYC and activating the account. It often includes your:
- Account info
- Debit card
- ATM PIN
- Customer ID (usually on the cover page or leaflet)
4. Cheque Book
Sometimes the Customer ID is mentioned on the inner pages or on the first slip of your cheque book.
5. Physical Statement
If you’ve received printed statements, the ID is often listed at the top. You can request a physical statement via the IOB Mobile App under “Request Services.”
Note: The charges: ₹100 + GST may apply for each duplicate statement request.
6. IOB Credit Card Kit
If you have an IOB Credit Card, your Customer ID might appear above the credit limit section or on the welcome documents provided with your card.
How to Check IOB Customer ID Online (Net Banking & Mobile App)
Indian Overseas Bank provides two official digital methods to help you find your Customer ID — via Internet Banking and the IOB Mobile App. Both methods require your registered mobile number, account number, debit card and an Active SMS pack. Here are the steps to follow –
1. IOB Netbanking
If you are already registered for IOB NetBanking or want to register as a new user, follow these steps:
- Search for “IOB Internet Banking” on Google
- Tap on “Personal Banking” under the login section.
- Simply, enter your Login ID and password to access.
- If you are not registered, follow these steps –
- Tap on New register button.
- Enter your Account Number, Mobile Number, Email ID and branch token or debit card.
- Create a Login ID and Password.
- Enter the Captcha Code and submit.
- Now, you need to use your Debit Card to activate the online system and verify via OTP.
- Once registered, simply use your ID and password to access.
- Go to the Dashboard → Tap on the Menu → Select Edit Profile.
- Click on “View My Customer ID” — your IOB CIF ID will be displayed on the screen.
2. IOB Mobile Banking App
If you have your smartphone and have installed the IOB App, it is much simpler for you. Follow the steps –
A few Requirements first:
- Registered Mobile Number
- Account Number
- Debit Card
- an Android or an iOS smartphone
Steps to follow –
- Download the “IOB Mobile” App
→ Available on both the Google Play Store and Apple App Store. - Open the app and select your preferred language.
- Tap on “Send SMS” to verify your SIM.
- Enter your Account Number when prompted.
- Here, you get the OTP to your phone to activate.
- Set a 6-digit MPIN (passcode) to log in securely.
- Complete first-time activation using your Debit Card.
- On the App dashboard, navigate to the Profile icon in your top-left corner.
- Your Customer ID will be clearly displayed in the profile section.
Note: confirm first that your SIM card has enough SMS balance for OTP and SIM verification.
Can You Get IOB Customer ID Using Mobile Number Only?
Many users search “how can I know my IOB customer ID using mobile number only, or via SMS, or missed call” — however, there’s no such option available as per the Indian Overseas Bank official website.
IOB does not allow customer ID retrieval using just mobile numbers for security reasons. You always need one of these:
- Registered account number and login ID
- Debit card or branch token
- Verified login to the IOB digital banking and mobile banking.
- Original bank-issued documents
How to Get IOB Customer ID for New Account Holders
If you just opened your IOB account:
- Wait for the Welcome Letter or Kit – it contain your all required details.
- Visit your home branch or ask your agent if you don’t receive one
- Ask the staff to write your Customer ID at the time of account activation
- Register immediately for digital banking to avoid future hassle
What to Do If You Lost Passbook and Login Details
Tip: Keep your Account Number and Date of Birth ready before calling.
1. IOB Customer Care Numbers:
- Toll-Free: 1800 890 4445 / 1800 425 4445
- Landline: +91-044-28889352
- NRI Helpline: 044 24353640 / 044 2851 9611
- Email: gmcsd@iob.in
When connected, tell them: “I want to know my Customer ID. I have my account details ready.” They may ask for: Your Full Name, Account Number, DOB, Registered Mobile Number.
Note: Never share full account numbers, OTP, passwords, and any other very personal details even with bank staff.
2. Visit the Nearest IOB Branch
This is the most reliable method if everything else fails.
Just walk into any IOB branch nearby you with:
- A valid Govt-approved ID (For ex., Aadhaar, PAN, driving license, Passport, etc.)
- Your old passbook or account number (if required)
Ask the staff to print or update your passbook with the Customer ID or request a proper document with all details.
Decoding the Customer ID in Indian Overseas Bank
Your Customer ID (also known as CIF Number in some places, like doing re-KYC) is a unique 11-digit number provided by the bank. It’s different from your Login ID or Account Number, and a unique number that acts as your digital identity across all IOB services.
To manage such a large customer base, IOB assigns a Customer ID as a special number to each individual. IOB bank has a touch customer base of over 4 crore (40 million).
Why Customer ID Is Important (Uses & Benefits)
The Customer ID is mandatory for:
- Opening or downloading account statements
- Logging into or registering for IOB NetBanking
- Registering on the IOB Mobile App
- Accessing your IOB mPassbook or mobile services
- Recovering or resetting your Login ID
- Doing Re-KYC of your account and filling out application forms at the branch.
Frequently Asked Questions
I forgot my IOB Customer ID — is it the same as my Login ID?
Nope. Your Login ID is user-created for netbanking login, but Customer ID is system-generated, provided by the bank and used to confirm a single identity across all your accounts.
Can I get my Customer ID through UPI apps like PhonePe?
Not directly. UPI apps don’t show Customer ID, you can use them to confirm account number, IFSC, if linked correctly.
Can I find the Customer ID using just my mobile number?
Not really, you still need your account number, debit card to retrieve it from the official methods offered by IOB Bank.
Can I find my IOB Customer ID without internet?
Yes, as I already told you, check your old physical statement and other official documents provided by the Bank. If lost or stolen, please visit your home branch for help.
Why does the IOB staff insist on Customer ID even when you know your account number?
Indian Overseas Bank systems fetch customer profiles using CIF, not account numbers. Branch staff can’t access KYC, loans, or digital services properly without a Customer ID, even if account details are correct.
Why do some IOB passbooks not show Customer ID clearly?
Older passbooks printed before CBS upgrades often missed CIF placement. Branches now manually write or reprint passbooks with Customer ID during re-KYC, account modification, or when issuing duplicate passbooks.
Can branch staff see my Customer ID without my debit card?
Yes. If your identity matches Aadhaar/PAN records, staff can retrieve CIF directly from CBS. A debit card is helpful but not mandatory during in-person verification at the branch counter.
Why does netbanking registration fail even with the correct details?
Most failures happen due to inactive SMS alerts or outdated mobile numbers. IOB systems block registration if OTP delivery or debit card mapping fails at the backend verification stage.
Does reopening a closed IOB account generate a new Customer ID?
Usually no. IOB reactivates your old CIF to maintain historical records. New IDs are issued only in rare cases like duplicate profiles or legacy data migration conflicts.
Is Customer ID required for non-digital services too?
Yes. Even offline services like account modification, service request via application form, nominee updates, or complaint registration require a Customer ID to pull your profile faster and reduce manual verification delays.
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