Hi

I am a newbie on futures and I was wondering if someone can help me understand how I can find the most liquid 3/5/10year treasuries futures ticker.
I downloaded NinjaTrader and started playing around with their market replay data but for each, for example, 5y Treasury future, there are several contracts/tickers. So how do I find the most liquid one easily?

Thank you

Iamito 

Hi I am a newbie on futures and I was wondering if someone can help me understand how I can find the most liquid 3/5/10year treasuries futures ticker. I downloaded NinjaTrader and started playing around with their market replay data but for each, for example, 5y Treasury future, there are several contracts/tickers. So how do I find the most liquid one easily? Thank you

Look at the instrument's specification page:
5-Year T-Note Futures Quotes - CME Group

As you can see, ZF is currently rolling from June to September 2018 as the most liquid contract.