Can I log into my PS4 account on another PS4?

Yes you can. You could even download your owned games and saved data(ps+ membership) on another ps4 while logged in. However you cannot log into two or more PS4 consoles at the same time with same PSN account.

How do you create a PSN account on PS4?

Press and hold the PS button to reveal the quick menu.
Select Power > Switch User > New User > Create a User.
Follow the on-screen prompts to create the account for PlayStation Network.
Enter the necessary information.
Verify your email address. Check your email for a verification message.

How do I register my PS4?

On your system, select (PS4 Link) > [Start], and then select [Remote Play] or [Second Screen]. Enter the number displayed on the PS4™ system’s screen, and then select [Register]. When registration is complete, the PS4™ system’s screen is displayed on your system.

Do I need to register my PS4 for warranty?

You can extend warranty period for 90 days by registering your console online. Online product registration must be completed within 1 year from the date of purchase with actual purchase date from the original purchase invoice. It doesn’t require online product registration.

How much is a PS4 warranty?

This warranty is a thirty-six (36) month warranty and must be purchased within thirty (30) days from your original PlayStation 4 purchase date. The first twelve (12) months will run along side your standard Limited Warranty and extend for twenty-four (24) additional months. This warranty will cost $59.99.

Where can I send my PS4 to be fixed?

PS4 Repair Options

Sony Repair Center. If your device is still under warranty then the best option would be to send it in to Sony for warranty repairs.
Local Repair Shop. This is a great option if you have a local repair shop who is experienced with the repair that is needed.
Mail in Repair Center.
DIY Repair.

Can Sony ban your IP address?

To put it bluntly, you are now blacklisted from accessing your account on PSN from anything that is tied to your public IP. There is no way to have your IP removed from the listing, it is a permanent ban imposed by a third party company.