Dar made his Test match umpiring debut in a match between Bangladesh and England at Dhaka in 2003. He has officiated 376 games across all formats.
The 51-year-old umpire considers Bucknor as his idol and is thankful to ICC, PCB, and his family.
"It's a great honour to equal the number of Test matches of my role model, umpire Steve Bucknor," ICC quoted Dar as saying.
"I am thankful to Almighty God, ICC, PCB (Pakistan Cricket Board), my colleagues, my coaches, my club P and T and especially thanks to my family as without their help it was not easy to achieve this," he added.
Besides Dar and Bucknor, South Africa's Rudi Koertzen is the only other umpire to have reached the three-figure mark in Tests, having stood in 108 Tests.