IITB IP Allocation provide by Computer Centre administers of Indian Institute of Technology Bombay, as you are asking for ITB IP Allocation info of New IP allocation Policy (Hostel 12),so I am providing same for you :

Wing Floor No IP address Subnet mask Default Gateway
A Ground 10.12.0.X 255.255.240.0 10.12.1.250
1st 10.12.1.X
2nd 10.12.2.X
3rd 10.12.3.X
4th 10.12.4.X
5th 10.12.5.X
6th 10.12.6.X
7th 10.12.7.X

B Ground 10.12.20.X 255.255.240.0 10.12.20.250
1st 10.12.21.X
2nd 10.12.22.X
3rd 10.12.23.X
4th 10.12.24.X
5th 10.12.25.X
6th 10.12.26.X
7th 10.12.27.X

C Ground 10.12.40.X 255.255.240.0 10.12.40.250
1st 10.12.41.X
2nd 10.12.42.X
3rd 10.12.43.X
4th 10.12.44.X
5th 10.12.45.X
6th 10.12.46.X
7th 10.12.47.X

Address

Indian Institute of Technology Bombay
Powai
Mumbai, Maharashtra 400076