d8a09277_e_DNS_lookups_on_Web_Site_Logs__Description
[Option] -x max tries [Description] 
Specifies the maximum number of attempts to resolve an IP address. Specifying 0 forces an indefinite attempt toward resolving the IP address. Works in conjunction with the -y switch. Default is 3 tries.
RDNSLOGS - Performs Reverse DNS lookups on Web Site Logs
Description