If you do decide to take the plunge and setup your own proxy, besides knowing how many IPs to get, which I discussed HERE, you should also be careful about the range of the IPs that your proxy server is assigned. Why is this important? It’s important because not only does Craigslist monitor IP activity, meaning you obviously can’t overpost using just a single IP, but it also monitors the range of IP activity. What you need to do is make sure any IPs you get for your proxy server are from different C class IP ranges if possible. It isn’t a topic that is discussed often, but by not making sure you are using IPs on your proxy server from different C class IP ranges you are opening the door to be blocked by Craiglsist.
IPs are seperated into four ranges, A B C and D. If that confused you, remember that IPs look like this: 87.125.98.43. They are divided into four sections, so this means that the four ranges are AAA.BBB.CCC.DDD. By using ranges we are able to log network IDs and network activity. Everyone on the internet is assigned an IP which is used to identify them while they are online. Most people know that by going offline and then back online you are able to change your IP, but usually the new IP you are assigned is within the same range, which in our example would be the DDD section. This makes it easy for companies to log your activities, as even though you have changed your IP, it has not been changed to the extent that they are unable to make any connection between your old and new IP. It is more than possible that this is exactly what Craigslist uses as part of their system to filter out spam. If you wish to remain anonymous to Craigslist, then C class IP ranges for your proxy server should help you to do so.
As already stated above, using IPs in the same C class IP range may make it possible for Craigslist to detect your activity even though you could be using several different accounts (since your new IP isn’t varied enough from the old one to make you look like a completely different user). This also applies to proxy servers and is why you should consider getting IPs from as many different C class IP ranges as possible. Generally speaking, most IPs on proxy servers are all from the same C class IP range, try to make sure this is not the case for your proxy server. How can you do this? There are two ways. The first is to simply ask your host if they can give you IPs from different C class ranges, and the second method is to just setup multiple proxy servers. Obviously the first method is cheaper, but sometimes a host won’t allow you to have different IP ranges on the same server. If you wish to post a lot of ads on Craigslist then remaining anonymous is very important, so be sure to get a Craigslist Proxy with IPs in different C class IP ranges.
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