thanks nate, i´ve found this. 
for who may need it...
if someone find more just let me know TO BLOCK IT! jejeje >:-#


thx

> Here is the final list which blocks AOL, MSN, ICQ, & Yahoo only:
> Blocking the IP of the messaging server is better than blocking ports. Most
> messengers will probe
> to find an open port.
>
>
> AOL Instant Messengers:
> AOLim_1 = 152.163.214.75
> AOLim_2 = 152.163.214.76
> AOLim_3 = 152.163.214.108
> AOLim_4 = 152.163.214.109
> AOLim_5 = 205.188.1.56
> AOLim_6 = 205.188.4.106
> AOLim_7 = 205.188.147.114
> AOLim_8 = 152.163.241.121
> AOLim_9 = 152.163.241.129
> AOLim_10 = 152.163.242.28
> AOLim_11 = 152.163.242.24
> AOLim_12 = 152.163.241.120
> AOLim_13 = 152.163.241.128
> AOLim_14 = 152.163.241.96
>
> ICQ Instant Messengers:
> ICQ_1 = 205.188.153.0
> ICQ_2 = 216.122.100.172
>
> MSN Instant Messengers:
> MSNim_1 = 207.46.183.253
>
> Yahoo Instant Messengers:
> Yahoo_1 = 24.71.200.68
> Yahoo_2 = 204.71.202,73
> Yahoo_3 = 204.71.200.54
> Yahoo_4 = 204.71.200.55
> Yahoo_5 = 204.71.200.56
> Yahoo_6 = 204.71.200.57
> Yahoo_7 = 204.71.177.35
> Yahoo_8 = 204.71.202.59
> Yahoo_9 = 204.71.202.58
> Yahoo_10 = 216.115.105.214
> Yahoo_11 = 204.71.201.47
> Yahoo_12 = 204.71.201.48
> Yahoo_13 = 216.115.105.215
> Yahoo_14 = 216.136.172.221
> Yahoo_15 = 216.115.107.63  es21.msg.yahoo.com
> Yahoo_16 = 216.115.107.64  es22.msg.yahoo.com
> Yahoo_17 = 216.115.107.65  es23.msg.yahoo.com
> Yahoo_18 = 216.115.107.66  es24.msg.yahoo.com
> Yahoo_19 = 216.115.107.67  es25.msg.yahoo.com
> Yahoo_20 = 216.115.107.101  es26.msg.yahoo.com
> Yahoo_21 = 216.115.107.102  es27.msg.yahoo.com
> Yahoo_22 = 216.115.107.103  es28.msg.yahoo.com
> Yahoo_23 = 216.115.107.104  es29.msg.yahoo.com
> Yahoo_24 = 216.115.107.105  es30.msg.yahoo.com
> Yahoo_25 = 216.136.173.179  es31.msg.yahoo.com




> 
> I have not tried this myself, haven't had a need but ..
> 
> find out which server(s)/subnet(s) the clients are connecting to and block
> all access to those ips at your external firewall or using router acls. I'm
> sure you can find some of the addresses with google, others you may
> just have to run a sniffer and track what addresses are being connected
> to.
> 
> nate
> 
> 
> 
> 
> 
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