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Nmap minor suggestion: "Initiating Parallel DNS resolution of XYZ hosts" is misleading #1918

cnotin opened this issue Feb 10, 2020 · 1 comment


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@cnotin cnotin commented Feb 10, 2020

According to the Nmap documentation:

Normally reverse DNS is only performed against responsive (online) hosts.

However when scanning a large range of XYZ total hosts, with many dead ones, Nmap still writes (in verbose mode):

Initiating Parallel DNS resolution of XYZ hosts. at HH:MM

It looks like it will perform a DNS resolution for all hosts, whereas it will only do it for online ones.

So I suggest adapting this message to show the real number of hosts that will be DNS resolved :)

@nmap-bot nmap-bot closed this in 6753d2e Feb 20, 2020

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@cnotin cnotin commented Feb 20, 2020

Thank you @bonsaiviking !

nitrogen17 added a commit to nitrogen17/nmap that referenced this issue Feb 21, 2020
Report actual number of hosts being resolved. Fixes nmap#1918
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