IOB based in Chennai, is a public sector bank with almost 3400 domestic branches, including 1150 branches in Tamil Nadu, and eight offices in overseas as of 31 October 2017. An ISO certified in-house Information Technology department, which had developed the software used by IOB to provide online banking to customers earlier. The IOB had a network of around 3300 ATMs across India, as of 2016. The branches of IOB are in Singapore, Bangkok, Colombo, Seoul. The representative offices of IOB are in Guangzhou, Dubai, and Vietnam. In 1937, the Indian Overseas Bank (IOB) was established by Thiru.M. Ct. M. Chidambaram Chettyar for encouraging foreign exchange operations and overseas banking. IOB opened a representative office each in Guangzhou, China, and Kualalampur. IOB opened other Representative offices in Dubai and the United Arab Emirates in the year 2009. In 2015, IOB launched m Passbook applications and new mobile banking services. The Apollo Munich Health Insurance has tied up with IOB to serve specialized health and personal accident products to its customers.