Brute force attack. Large number of failed login attempts on my webserver from this IP: 216.24.240.138 Reverse DNS: 138-240-24-216-dedicated.multacom.com Origin Country: United States (US)
Many Unauthorized remote login attempts. Failed SSH login attempt from 216.24.240.138 at 2012:10:10-15:49:12 with username root.
Failed login attempts to account root (system) -- Large number of attempts from this IP: 198.74.116.2 Reverse DNS: 2-116-74-198-dedicated.multacom.com Origin Country: United States (US)
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- Why Can't I See The Exact Address?
DNSBL* - is a list of IP addresses published through the Internet Domain Name Service (DNS) either as a zone file that can be used by DNS server software, or as a live DNS zone that can be queried in real-time. DNSBLs are most often used to publish the addresses of computers or networks linked to spamming; most mail server software can be configured to reject or flag messages which have been sent from a site listed on one or more such lists.
WHOIS** - is a query/response protocol that is widely used for querying databases in order to determine the registrant or assignee of Internet resources, such as a domain name, an IP address block, or an autonomous system number. WHOIS lookups were traditionally performed with a command line interface application, and network administrators predominantly still use this method, but many simplified web-based tools exist. WHOIS services are typically communicated using the Transmission Control Protocol (TCP). Servers listen to requests on the well-known port number 43.
** Approximate Geographic Location - This is NOT the exact geographical location of the person/organization with the given IP address. However, this should still give you a good idea about the area/region where this person/orgranization is located.