our server has been subjected to sustained brute force attacks from this IP Oct 21 03:52:29 server1 sshd[23621]: Failed password for invalid user testuser from 199.168.141.203 port 52794 ssh2 Oct 21 03:52:29 server1 sshd[23622]: Received disconnect from 199.168.141.203: 11: Bye Bye Oct 21 03:52:29 server1 sshd[23623]: Invalid user testuser from 199.168.141.203 Oct 21 03:52:29 server1 sshd[23624]: input_userauth_request: invalid user testuser Oct 21 03:52:29 server1 sshd[23623]: pam_unix(sshd:auth): check pass; user unknown Oct 21 03:52:29 server1 sshd[23623]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=mail1.jornalportoalegre.enviosilimitados.com.br Oct 21 03:52:31 server1 sshd[23623]: Failed password for invalid user testuser from 199.168.141.203 port 53478 ssh2 Oct 21 03:52:31 server1 sshd[23624]: Received disconnect from 199.168.141.203: 11: Bye Bye Oct 21 03:52:31 server1 sshd[23626]: Invalid user testuser from 199.168.141.203 Oct 21 03:52:31 server1 sshd[23627]: input_userauth_request: invalid user testuser Oct 21 03:52:31 server1 sshd[23626]: pam_unix(sshd:auth): check pass; user unknown Oct 21 03:52:31 server1 sshd[23626]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=mail1.jornalportoalegre.enviosilimitados.com.br Oct 21 03:52:33 server1 sshd[23626]: Failed password for invalid user testuser from 199.168.141.203 port 54115 ssh2 Oct 21 03:52:33 server1 sshd[23627]: Received disconnect from 199.168.141.203: 11: Bye Bye Oct 21 03:52:33 server1 sshd[23629]: Invalid user testuser from 199.168.141.203 Oct 21 03:52:33 server1 sshd[23630]: input_userauth_request: invalid user testuser Oct 21 03:52:33 server1 sshd[23629]: pam_unix(sshd:auth): check pass; user unknown Oct 21 03:52:33 server1 sshd[23629]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=mail1.jornalportoalegre.enviosilimitados.com.br Oct 21 03:52:35 server1 sshd[23629]: Failed password for invalid user testuser from 199.168.141.203 port 54742 ssh2 Oct 21 03:52:35 server1 sshd[23630]: Received disconnect from 199.168.141.203: 11: Bye Bye Oct 21 03:52:35 server1 sshd[23634]: Invalid user testuser from 199.168.141.203 Oct 21 03:52:35 server1 sshd[23635]: input_userauth_request: invalid user testuser Oct 21 03:52:35 server1 sshd[23634]: pam_unix(sshd:auth): check pass; user unknown Oct 21 03:52:35 server1 sshd[23634]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=mail1.jornalportoalegre.enviosilimitados.com.br Oct 21 03:52:37 server1 sshd[23634]: Failed password for invalid user testuser from 199.168.141.203 port 55484 ssh2 Oct 21 03:52:37 server1 sshd[23635]: Received disconnect from 199.168.141.203: 11: Bye Bye Oct 21 03:52:37 server1 sshd[23637]: Invalid user testuser from 199.168.141.203 Oct 21 03:52:37 server1 sshd[23638]: input_userauth_request: invalid user testuser Oct 21 03:52:37 server1 sshd[23637]: pam_unix(sshd:auth): check pass; user unknown Oct 21 03:52:37 server1 sshd[23637]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=mail1.jornalportoalegre.enviosilimitados.com.br
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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.