my AIR is 591 gate score 730 in Ece which iit i can get

Hello Saubhadra, first of all congratulations on getting such a good score in GATE. You can assess your chances of getting into IITs by considering previous year's cut offs of electronics and communication engineering.

Following is the previous year's cut off for M.Tech in various IITs for all categories(gen/OBC/SC/ST/PwD):

1. IIT Delhi (2018)

General- 675

OBC- 620

SC/ST/PH- 415

2. IIT Madras (depending on different courses provided in M.Tech, therefore you can look into the link given below and see the cut offs according to your choice)

https://engineering.careers360.com/articles/gate-cutoff-for-iit-madras

3. IIT Bombay (2018)

General- 510

OBC (NCL)- 459

SC/ST- 340

4. IIT Kharagpur ( it also depends upon courses provided, check the link)

https://engineering.careers360.com/articles/gate-cutoff-for-iit-kharagpur

5. IIT Guwahati (2017)

General- 411

ST- 339

6. IIT Kanpur (2017)

General- 720

OBC- 612

SC/ST/PwD- 475

7. IIT Roorkee

General- 53.54

OBC- 48.59

SC- 35.95

ST- 36.75

PD- 37.5

8. IIT Hyderabad (2017)

General- 697

OBC- 658

SC- 508

ST- 444

9. IIT Indore- (check the link)

https://engineering.careers360.com/articles/gate-cutoff-for-iit-indore

10. IIT BHU

General- 618

OBC- 566

SC- All Applicants

11. IIT Jodhpur (2018)

General- (707-630)

OBC- (624-567)

SC/ST/ PwD- (514-415)

12. IIT Gandhinagar (2017)

General- 600

OBC- 540

SC/ST/PwD- 400

13. IISc Bangalore (2018)

General- (1000-898)

OBC- (923- 818)

SC- 627

ST- 395

14. IIT Dhanbad (2017)

General- 471

OBC- 383

SC- 295

ST- 263

So after looking at the previous year's cut off you have very high chances of getting into IIT of your choice.

But if you want to have a more accurate prediction, go visit the college predictor (link given below):

http://bit.ly/2J9S0MN

All the best!

I hope this helps.