India STD Code Lookup

What is an STD Code?

STD stands for Subscriber Trunk Dialing. It is the area code system used in India to make long-distance landline telephone calls without operator assistance. Each city and town in India is assigned a unique STD code by the Department of Telecommunications (DoT). Major metro cities like Delhi (011), Mumbai (022), Chennai (044), and Kolkata (033) have short 2-3 digit codes, while smaller towns have 4-5 digit codes. The STD system was introduced in India in the 1960s and remains essential for landline telephony.

How to Dial Using STD Codes

• Domestic call: Dial 0 + STD Code + Phone Number
  Example: 011-23456789 (New Delhi)
• International call to India: Dial +91 + STD Code (without 0) + Phone Number
  Example: +91-22-23456789 (Mumbai)
• Local call:No STD code needed — dial the phone number directly within the same area.

STD Code Format

Indian STD codes follow a hierarchical numbering plan managed by DoT. The total digits (STD code + subscriber number) always add up to 10 digits (excluding the trunk prefix 0):

• 2-digit STD codes(e.g., 11, 22, 33, 44, 80) — 8-digit subscriber numbers — major metros
• 3-digit STD codes(e.g., 141, 265, 484) — 7-digit subscriber numbers — large cities
• 4-digit STD codes(e.g., 1892, 5942) — 6-digit subscriber numbers — towns
• 5-digit STD codes(e.g., 08472, 03222) — 5-digit subscriber numbers — smaller towns

Tips for Calling Indian Landlines

• Mobile numbers in India start with 6, 7, 8, or 9 and do not use STD codes — just dial the 10-digit number.
• When calling from a mobile phone within India, always prefix the STD code with 0 (e.g., 0522-XXXXXXX for Lucknow).
• STD codes starting with 0 are only for domestic dialing. For international calls, replace the leading 0 with +91.
• BSNL and MTNL are the primary landline operators in India. Private operators like Jio and Airtel also offer landline services in many cities.
• If you hear "The number you have dialed does not exist," verify the STD code — the city may have been reassigned a different code.
• Some cities share STD codes with nearby areas. For example, Noida (0120) and Ghaziabad (0131) are separate from Delhi (011) despite being part of the NCR region.