adding OSINT resources

useful_commands_and_scripts/dns_recon.md

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+# DNS Reconnassaince
+
+## DNSRECON
+* [dnsrecon](https://github.com/darkoperator/dnsrecon) - DNS Enumeration Script created by Carlos Perez (darkoperator)
+
+Reverse lookup for IP range:
+`./dnsrecon.rb -t rvs -i 10.1.1.1,10.1.1.50`
+
+Retrieve standard DNS records:
+`./dnsrecon.rb -t std -d example.com`
+
+Enumerate subdornains:
+`./dnsrecon.rb -t brt -d example.com -w hosts.txt`
+
+DNS zone transfer:
+`./dnsrecon -d example.com -t axfr`
+
+
+## Parsing NMAP Reverse DNS Lookup
+
+`nmap -R -sL -Pn -dns-servers dns svr ip range | awk '{if( ($1" "$2" "$3)=="NMAP scan report")print$5" "$6}' | sed 's/(//g' | sed 's/)//g' dns.txt `