Most of the sites on my server only target US traffic, but a few deal with international so I can't really block through the firewall. Currently, I have a MySQL table with a series of IP ranges listed, and I allow each user to access that table in their header and deny access to any IP within a found range, which saves a lot of server stress but it doesn't help prevent spam (unfortunately).

I'm pasting below the IP ranges that are being blocked. I'm concerned about the list staying updated, though... I had one local internet provider that started using what used to be a foreign IP range, so now I worry that I need to access an up-to-date public database somewhere.

So the first question is, can you guys recommend a way to block RIPE, APNIC, AFRINIC, and LACNIC IPs on a site level? And, if possible, on an email level?

If not, what are your thoughts on permanently blocking the following IP ranges? If it's not a good idea, do you know of a public database I can use instead of gathering them locally?

# Russia .ru
89.0.0.0/8

# RIPE.NET (Europe, the Middle East and parts of Central Asia)
62.0.0.0/8
77.0.0.0/8
78.0.0.0/8
79.0.0.0/8
80.0.0.0/8
81.0.0.0/8
82.0.0.0/8
83.0.0.0/8
84.0.0.0/8
85.0.0.0/8
86.0.0.0/8
87.0.0.0/8
88.0.0.0/8
89.0.0.0/8
90.0.0.0/8
91.0.0.0/8
193.0.0.0/8
194.0.0.0/8
195.0.0.0/8
212.0.0.0/8
213.0.0.0/8
217.0.0.0/8

# APNIC (Asian Pacific Network Information Center)
58.0.0.0/8
59.0.0.0/8
60.0.0.0/8
61.0.0.0/8
202.0.0.0/8
203.0.0.0/8
210.0.0.0/8
211.0.0.0/8
218.0.0.0/8
219.0.0.0/8
220.0.0.0/8
221.0.0.0/8
222.0.0.0/8
116.0.0.0/8
117.0.0.0/8
118.0.0.0/8
119.0.0.0/8
120.0.0.0/8
121.0.0.0/8
122.0.0.0/8
123.0.0.0/8
124.0.0.0/8
125.0.0.0/8
126.0.0.0/8

# LACNIC (Latin American and Caribbean Network Information Center)
189.0.0.0/8
190.0.0.0/8
200.0.0.0/8
201.0.0.0/8

# Other
141.0.0.0/8
88.0.0.0/8
85.0.0.0/8