Enumeration Methodology
=Use tools such as Whois Lookup
=Use Subnet Mask Calculators
=Use tools such as Nmap (nmap -sP xx.xx.xx.xx - xx)
=Use tools such as Nmap (nmap -sS xx.xx.xx.xx - xx)
=Use tools such as Hyena and Network Security Auditor, NetScanTools Pro
=Use tools such as Oputils, engineers Toolset
=Use tools such as Softerra LDAP administrator
=Use commands such as ntptrace, ntpdc and ntpq
=Use tools such as Netscan tools pro
=Use Windows utility NSLookup
=use tools such as Nmap, Ike-scan, Svmap, NetscanTools Pro