What ISP are you using? Also the only way to get the same IP is not to change it. Depending on your ISP they will use a large pool of IP's for everyone, also if you need a Static IP you can contact your ISP to get one but I honestly don't think it's a good idea if you are running multiple Accounts.
Ebay/Paypal doesn't care if you have the same IP or different, just needs to make sure you don't use the same IP on different accounts.
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