Nmap: Network Exploration and Security Auditing Cookbook - Second Edition

Disabling cache

Sometimes, cached responses will be preferred over querying the WHOIS service, and this might prevent the discovery of an IP address assignment. To disable cache, you could set the script argument whodb to nocache:

$nmap -sn --script whois-ip --script-args whois.whodb=nocache <target>  

As with every free service, we need to consider the number of queries that we need to make to avoid reaching the daily limit and getting banned.