How can i change my public ip?

You most likely can just turn the modem off for a while and it will get a different IP. All depends if you provider gave you a static one (normally they charge extra) or they have a very high timeout.

If they own the vent server it will very well give them your public IP. One of the key reasons to not use a private vent server.

What they can do with your IP is not much. They can of course try denial of service but they will soon tire of that. If they are very skilled they might be able to disconnect you from a game with ip spoofing but you can get right back in.

Just be sure you do not have port forwarding or DMZ configured. The NAT function in the router because it is stupid will not know which machine in your house to send traffic to so it will just throw it away. Nat alone does almost as much as a firewall.

Most likely they are script kiddies that talk big but have no clue how to really attack someone.

yea he says hes hacked ppls accounts and such but really it was all scam...if he ddos me my isp would know or would i have to call?

Anyone who threatens you with an intentional DoS attack should be brought to the attention of the ISP, esp. if you have written proof. It might very well be illegal in some jurisdictions and shouldn't be tolerated! At the very least, he might be using the same ISP (or your ISP may be able to work w/ his ISP), and they might not take kindly to such threats to their customers and their network, perhaps in turn threatening to take THEM offline, permanently!

i don't have written proof or a ss or recorded his voice saying it  ,i do know where he lives and is fb and other infos

Best answer selected by ryan333.

What IP are you using?Static or Dynamic?If it is dynamic you can easily change it by resetting your modem (Switch it OFF and ON) or in Windows operating systems, open a command prompt and type "ipconfig /release," which dumps the automatic address it had, and then "ipconfig /renew," which gets a new address, which will be in the address space that you just changed the router to. Of course you won't type the quotes, and depending on which Windows version you have you may need to make it "release all" and "renew all."For Mac OS, either restart your computer, or go to the Apple menu, choose System Preferences, choose Network from the View menu, and then Active Network Ports from the View menu. Deselect the "ON" checkbox for your network adapter, click on Apply, then reselect the "ON" checkbox and click Apply again. Finally you can check your new ip address at IP-Details.com ....if they win the vent they probably have the provision to view your Public IP. Do not get frightened by the threaten...if it is illegal then you can approach them legally.