
There are two different types of services that act as an IP changer online.
Virtual Private Networks
The first is called a virtual private network (VPN). VPNs are private networks that are often used by companies, institutions, government institutions, and individuals. They offer high security networks with encryption and tunneling protocols. When connected to a VPN, all software running and data sent over your connection is protected on these two levels. Each computer/phone connected to the network is assigned a virtual IP address, which allows you to pass many firewalls.
Proxies
An alternative IP changer online is a proxy. When using a proxy, requests from your computer for traffic are sent to the proxy, where it analyzes them, strips your IP data from the request, and allows you to browse the web through its server. Data stored in the proxy means you are actually accessing the proxies stored info, and not that of the website requested. In this way you're able to bypass firewalls, because you're not communicating directly with the blocked sites IP.
Which one to use?
There is a lot of Internet jargon to go over in the short space of a blog post that will keep you interested. In a nutshell, as you've requested to find an "IP changer online", most likely, both a proxy or a VPN will do. They both make you anonymous while you browse the Internet, though they do it in different ways. However, there are some differences to note.
Proxies don't actually "change" your IP, but "mask" it. This means that it won't get past every filter, and some sites actually block proxy users because they're often used for illegal activity. You also won't get access to Hulu/Netflix/BBC iPlayer, and you won't be able to choose your country location (though most proxies will stick to the US/UK if not NE/DE.
Using a web based proxy as your IP changer online works great for those that want to bypass firewalls at work and school because there's nothing to install. Everything is accessible from your web browser or email inbox.
Cheap, Fast, Reliable, and Spam Free Web Based Proxy ($6/month) – SecuriTales
www.securitales.com
VPNs as an IP changer online provide better security, in more forms, and for all your programs/apps. They assign you an IP that can pass most firewalls, and you can even sign up for a dedicated IP if you want a new IP address, but don't want it changing all the time. However, VPNs are a bit more expensive, and you've got to install them, so sneaking around on Facebook at work and school isn't really an option.
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19,000+ IP addresses for $6.55/ month ($79/year) – Hide My Ass
Dedicated IP addresses for $12.08/ month ($145/year) – PureVPN