how to deny host

[lemon_3]

hi all
i have a rsyncd.conf file and i want to deny all host except my trust host,for example 
in rsyncd.conf:

host deny = all ip addresses
host allow = my ip address

i read the manual but i am very new to the ip and netmask and don't know how to 
configure it.please tell me what the format is,more specifically.

thanks in advance
  
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