******* Chinese trying root hack my server from synchonius root machines in same Ip domain: May 27 14:48:16 NRK1 sshd[28954]: refused connect from 144.0.0.29 (144.0.0.29) May 27 14:48:17 NRK1 sshd[28955]: refused connect from 144.0.0.29 (144.0.0.29) May 27 14:48:17 NRK1 sshd[28956]: refused connect from 144.0.0.36 (144.0.0.36) May 27 14:48:18 NRK1 sshd[28958]: refused connect from 144.0.0.36 (144.0.0.36) May 27 14:48:18 NRK1 sshd[28959]: refused connect from 144.0.0.36 (144.0.0.36) May 27 14:48:19 NRK1 sshd[28909]: error: PAM: Authentication failure for root from 144.0.0.36 May 27 14:48:19 NRK1 sshd[28909]: Failed keyboard-interactive/pam for root from 144.0.0.36 port 48343 ssh2 May 27 14:48:19 NRK1 sshd[28960]: refused connect from 144.0.0.29 (144.0.0.29) May 27 14:48:19 NRK1 sshd[28889]: error: PAM: Authentication failure for root from 144.0.0.36 May 27 14:48:19 NRK1 sshd[28889]: Failed keyboard-interactive/pam for root from 144.0.0.36 port 48333 ssh2 May 27 14:48:21 NRK1 sshd[28962]: refused connect from 144.0.0.36 (144.0.0.36) May 27 14:48:21 NRK1 sshd[28909]: error: PAM: Authentication failure for root from 144.0.0.36 May 27 14:48:21 NRK1 sshd[28909]: Failed keyboard-interactive/pam for root from 144.0.0.36 port 48343 ssh2 May 27 14:48:23 NRK1 sshd[28963]: refused connect from 144.0.0.29 (144.0.0.29)
The IP address [144.0.0.36] experienced 5 failed attempts when attempting to log into SSH within 5 minutes, and was blocked at Fri Jul 25 22:43:50 2014
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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.