First of all, be aware that not everyone can change their IP address. IP addresses are provided by your Internet service provider. Some Internet Service Providers give you a static IP address (it never changes for the entire period of your subscription), and other Internet Service Providers give you a dynamic IP address that changes every 24 hours or so so that changes when you restart your ADSL modem. As stated in this article: What is an IP address, you can also use a VPN that will allow you to change IP address as many times as you want. even if your ISP provides you with a fixed IP address.
Looking informations about an IP address. Find the location : city, country, longitude, latitude ...
Enter an IP address and find where the ip address is listed. This RBL check uses multiple servers.
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The SPF Check tool allows you to check whether the SPF of your DNS records is declared.