IP address for office is rechargeable. You should pay ¥150 for per port opening and ¥25 or more for per IP.
The procedure of applying a new IP address of office as follows:
1. Visit my.sjtu.edu.cn with your jAccount. Find "Tsaks", then find“网络服务” under the “服务大厅”, andchoose “IP申请”.
If you don't have a jAccount, click the linkI want a jAccount.

2. Fill in the related Information including MAC address, building, room and jAccount for the payment, then click “下一步”to continue.

3.After all the procedure is done, you can check the progress of your application under “In Progress”.And all completed application shows under “Completed”.

4.When the IP applying task is completed, you will receive a message of the information about your IP.