Can someone tell me what is the weightage of different sectors in Nifty,{ like CNXIT, bank nifty etc? }

CNXIT, Bank Nifty are Indices similar to Nifty.

Many Stocks constitute to form an Index. You can find the constituents of Nifty and the relevant links by clicking here: http://www.nseindia.com/content/indices/niftymcwb.csv

Source: www.nseindia.com

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NSE keeps documenting the Sector representation in S&P CNX NIFTY at their website. Refer the Fact sheet of CNX Nifty.

There is no direct valaue available. You need to do some reverse calculation.
You need to download market wise weightage files of those indices from nse website and check individual weightages.
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