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Bulk DNS Lookup bash script
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| #!/bin/bash | |
| # Bulk DNS Lookup | |
| # Generates a CSV of DNS lookups from a list of domains. | |
| # | |
| # File name/path of domain list: | |
| domain_list='domains.txt' # One FQDN per line in file. | |
| # | |
| # IP address of the nameserver used for lookups: | |
| ns_ip='1.1.1.1' # Is using Cloudflare's 1.1.1.1. | |
| # | |
| # Seconds to wait between lookups: | |
| loop_wait='1' # Is set to 1 second. | |
| echo "Domain name, IP Address, IP PTR, IP NetName (WHOIS)"; # Start CSV | |
| for domain in `cat $domain_list` # Start looping through domains | |
| do | |
| ip=`dig @$ns_ip +short $domain |tail -n1`; # IP address lookup | |
| if [ ! -n "$ip" ] # If the IP is null (expired or invalid domain) | |
| then # Then | |
| echo "$domain,No DNS,,"; # Write "No DNS" in the IP column | |
| else # And if an IP is found perform a PTR and NetName lookup | |
| echo -en "$domain,$ip,"`dig @$ns_ip +short -x $ip |xargs`","; | |
| whois $ip |grep -i 'netname' |awk '{print $NF}'|xargs; | |
| fi | |
| sleep $loop_wait # Pause before the next lookup to avoid flooding NS | |
| done; |
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