After crossing 20,000 points level in early trade and again for a second time in the last hour, the Sensex closed with a gain 80.41 points, or 0.40 per cent, at 19,986.82.
This was the first time since January 6, 2011 that the index crossed the 20,000-mark.
Buying was seen mainly in blue-chip stocks like ITC, Bharti Airtel, ICICI Bank, Tata Motors and ONGC, that contributed the most to Sensex rise. However, profit booking in counters like Infosys, CIL, SBI and Sterlite capped gains.
Bharti Airtel, which rose 4.81 per cent, was the best performer in Sensex today on hopes of tariff hikes.
While the sentiment was buoyant on good set of numbers from Tata Consultancy Services, HCL Tech and Axis Bank, lack of direction due to global markets closing narrowly mixed did not help Indian markets, experts said.
The NSE Nifty closed with a gain of 32.55 points, or 0.54 per cent, at 6,056.60, after touching day's high of 6,068.50.
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"It was another strong day for the markets with the Sensex crossing the 20000 mark during the day. Strong results from companies so far have buoyed the sentiments of market," said Dipen Shah, Head of PCG Research, Kotak Securities.
Yesterday, Sensex had spurted by 242.77 points after postponement of the implementation of controversial GAAR by two years until April 2016 and fall in inflation (WPI) to 3-year low. (MORE)