Scan hostnames efficiently with Nmap

Wednesday, 11 July 2007, 1:36 AM EST

Your DNS team sends you the company’s entire domain name inventory in a CSV (comma-separated values) file. You’re tasked with port scanning those hosts, to perform a network inventory, discover rogue services and other policy violations. It’s simple to do this with a short list of domains and a small number of servers. For those who are responsible for entire data centers, hosting thousands of domain names, you’ll need an efficient way to perform this. Since some IP addresses can be hosting more than one domain, and some domains are hosted on multiple servers, a little scripting can help you out.

At ts/sci security.

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