Just a short snippet from my logs: Apr 4 00:48:25 zdolinux sshd[54205]: Failed keyboard-interactive/pam for invalid user nagios from 130.238.11.42 port 46528 ssh2 Apr 4 00:48:26 zdolinux sshd[54208]: Failed keyboard-interactive/pam for invalid user nagios from 130.238.11.42 port 47968 ssh2 Apr 4 00:48:27 zdolinux sshd[54212]: Failed keyboard-interactive/pam for invalid user nagios from 130.238.11.42 port 49169 ssh2 Apr 4 00:48:28 zdolinux sshd[54215]: Failed keyboard-interactive/pam for invalid user nagios from 130.238.11.42 port 50624 ssh2 Apr 4 00:48:29 zdolinux sshd[54218]: Failed keyboard-interactive/pam for invalid user backuppc from 130.238.11.42 port 51826 ssh2 Apr 4 00:48:30 zdolinux sshd[54221]: Failed keyboard-interactive/pam for invalid user wolfgang from 130.238.11.42 port 53085 ssh2 Apr 4 00:48:31 zdolinux sshd[54224]: Failed keyboard-interactive/pam for invalid user vmware from 130.238.11.42 port 54592 ssh2 Apr 4 00:48:32 zdolinux sshd[54227]: Failed keyboard-interactive/pam for invalid user stats from 130.238.11.42 port 55756 ssh2 Apr 4 00:48:33 zdolinux sshd[54230]: Failed keyboard-interactive/pam for invalid user kor from 130.238.11.42 port 57011 ssh2 Apr 4 00:48:34 zdolinux sshd[54233]: Failed keyboard-interactive/pam for invalid user wei from 130.238.11.42 port 58343 ssh2 Apr 4 00:48:35 zdolinux sshd[54236]: Failed keyboard-interactive/pam for invalid user cvsuser from 130.238.11.42 port 59755 ssh2 Apr 4 00:48:35 zdolinux sshd[54239]: Failed keyboard-interactive/pam for invalid user cvsuser from 130.238.11.42 port 32882 ssh2 Apr 4 00:48:36 zdolinux sshd[54242]: Failed keyboard-interactive/pam for invalid user cvsuser from 130.238.11.42 port 34083 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.