This IP tried to break in to my system. Please check the below logs. Feb 7 21:46:25 fw1 sshd[3591]: Did not receive identification string from 121.241.105.70 Feb 7 21:49:03 fw1 sshd[3592]: reverse mapping checking getaddrinfo for 121.241.105.70.static-delhi.vsnl.net.in [121.241.105.70] failed - POSSIBLE BREAK-IN ATTEMPT! Feb 7 21:49:03 fw1 sshd[3592]: Invalid user globus from 121.241.105.70 Feb 7 21:49:03 fw1 sshd[3592]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.241.105.70 Feb 7 21:49:04 fw1 sshd[3592]: Failed password for invalid user globus from 121.241.105.70 port 36772 ssh2 Feb 7 21:49:05 fw1 sshd[3594]: reverse mapping checking getaddrinfo for 121.241.105.70.static-delhi.vsnl.net.in [121.241.105.70] failed - POSSIBLE BREAK-IN ATTEMPT! Feb 7 21:49:05 fw1 sshd[3594]: Invalid user marine from 121.241.105.70 Feb 7 21:49:05 fw1 sshd[3594]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.241.105.70 Feb 7 21:49:07 fw1 sshd[3594]: Failed password for invalid user marine from 121.241.105.70 port 39002 ssh2
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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.