Must be a valid IPv4 or IPv6 ip address, e.g. 127.0.0.1 or 2001:DB8:0:0:8:800:200C:417A
Basic Info

City: Yeongdeungpo-dong

Region: Seoul

Country: South Korea

Internet Service Provider: KT Corporation

Hostname: unknown

Organization: Korea Telecom

Usage Type: unknown

Comments:
Type Details Datetime
attackspambots
Invalid user vbs from 211.54.40.81 port 54174
2019-09-25 20:11:53
attackbotsspam
Automatic report - Banned IP Access
2019-09-24 16:47:42
attackspam
fail2ban
2019-09-19 19:01:26
attackbots
Sep  6 17:05:56 srv206 sshd[22723]: Invalid user test2 from 211.54.40.81
Sep  6 17:05:56 srv206 sshd[22723]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=211.54.40.81
Sep  6 17:05:56 srv206 sshd[22723]: Invalid user test2 from 211.54.40.81
Sep  6 17:05:58 srv206 sshd[22723]: Failed password for invalid user test2 from 211.54.40.81 port 55847 ssh2
...
2019-09-07 06:47:44
attack
Aug 17 10:52:36 jane sshd\[20826\]: Invalid user zabbix from 211.54.40.81 port 37615
Aug 17 10:52:36 jane sshd\[20826\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=211.54.40.81
Aug 17 10:52:38 jane sshd\[20826\]: Failed password for invalid user zabbix from 211.54.40.81 port 37615 ssh2
...
2019-08-17 16:54:38
attackbotsspam
Aug 17 04:36:50 debian sshd\[4967\]: Invalid user zabbix from 211.54.40.81 port 38423
Aug 17 04:36:50 debian sshd\[4967\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=211.54.40.81
...
2019-08-17 11:54:11
Comments on same subnet:
No discussion about this subnet yet..
Whois info:
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Dig info:

; <<>> DiG 9.10.3-P4-Ubuntu <<>> 211.54.40.81
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 23846
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;211.54.40.81.			IN	A

;; AUTHORITY SECTION:
.			3600	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2019040300 1800 900 604800 86400

;; Query time: 2 msec
;; SERVER: 67.207.67.3#53(67.207.67.3)
;; WHEN: Wed Apr 03 19:26:31 +08 2019
;; MSG SIZE  rcvd: 116

Host info
Host 81.40.54.211.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		67.207.67.3
Address:	67.207.67.3#53

** server can't find 81.40.54.211.in-addr.arpa: NXDOMAIN

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