Annoying RedAlert.com activity

[Jack L. Stone]

This is semi-OT, but is a FBSD firewall question.

Every day, I see this in the logs:
65.194.51.136 - - [29/Mar/2003:00:26:47 -0600] "HEAD / HTTP/1.0" 200 0 "-"
"RedAlert.com"
65.194.51.133 - - [29/Mar/2003:00:26:47 -0600] "HEAD / HTTP/1.0" 200 0 "-"
"RedAlert.com"
65.194.51.131 - - [29/Mar/2003:00:26:49 -0600] "HEAD / HTTP/1.0" 200 0 "-"
"RedAlert.com"
65.194.51.135 - - [29/Mar/2003:00:26:50 -0600] "HEAD / HTTP/1.0" 200 0 "-"
"RedAlert.com"
65.194.51.132 - - [29/Mar/2003:00:26:52 -0600] "HEAD / HTTP/1.0" 200 0 "-"
"RedAlert.com"
65.194.51.134 - - [29/Mar/2003:00:26:55 -0600] "HEAD / HTTP/1.0" 200 0 "-"
"RedAlert.com"
65.194.51.155 - - [29/Mar/2003:00:28:24 -0600] "HEAD / HTTP/1.0" 200 0 "-"
"RedAlert.com"
65.194.51.156 - - [29/Mar/2003:00:29:14 -0600] "HEAD / HTTP/1.0" 200 0 "-"
"RedAlert.com"
65.194.51.137 - - [29/Mar/2003:00:30:45 -0600] "HEAD / HTTP/1.0" 200 0 "-"
"RedAlert.com"
65.194.51.154 - - [29/Mar/2003:00:34:13 -0600] "HEAD / HTTP/1.0" 200 0 "-"
"RedAlert.com"
65.194.51.152 - - [29/Mar/2003:00:34:21 -0600] "HEAD / HTTP/1.0" 200 0 "-"
"RedAlert.com"
65.194.51.151 - - [29/Mar/2003:00:34:50 -0600] "HEAD / HTTP/1.0" 200 0 "-"
"RedAlert.com"
65.194.51.165 - - [29/Mar/2003:00:34:52 -0600] "HEAD / HTTP/1.0" 200 0 "-"
"RedAlert.com"

Question:
At the "redalert.com" web site, they claim to be a server monitoring
service, but I've never signed up for the service and don't want this daily
waste of BW that appears on all of my web servers. It is annoying and I
would like to block their network via the firewall.

Based on the above, what would be the best choice of how to block the network:
65.194.51.?/?

Thanks for any suggestions....

Best regards,
Jack L. Stone,
Administrator

SageOne Net
http://www.sage-one.net
jackstone at sage-one.net