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: Seongnam-si

Region: Gyeonggi-do

Country: South Korea

Internet Service Provider: KT Corporation

Hostname: unknown

Organization: Korea Telecom

Usage Type: unknown

Comments:
Type Details Datetime
attackspam
Apr 14 08:52:01 server sshd\[226925\]: Invalid user ftpuser from 121.135.121.53
Apr 14 08:52:01 server sshd\[226925\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=121.135.121.53
Apr 14 08:52:03 server sshd\[226925\]: Failed password for invalid user ftpuser from 121.135.121.53 port 44230 ssh2
...
2019-07-17 07:13:22
Comments on same subnet:
No discussion about this subnet yet..
Whois info:
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Dig info:

; <<>> DiG 9.10.3-P4-Ubuntu <<>> 121.135.121.53
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 43928
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

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

;; AUTHORITY SECTION:
.			3600	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2019041301 1800 900 604800 86400

;; Query time: 2 msec
;; SERVER: 67.207.67.3#53(67.207.67.3)
;; WHEN: Sun Apr 14 07:10:35 +08 2019
;; MSG SIZE  rcvd: 118

Host info
Host 53.121.135.121.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		67.207.67.3
Address:	67.207.67.3#53

** server can't find 53.121.135.121.in-addr.arpa: NXDOMAIN

Related IP info:
Related comments:
IP Type Details Datetime
77.45.85.95 attackbotsspam
Aug 15 01:23:08 mail.srvfarm.net postfix/smtps/smtpd[915291]: warning: 77-45-85-95.sta.asta-net.com.pl[77.45.85.95]: SASL PLAIN authentication failed: 
Aug 15 01:23:08 mail.srvfarm.net postfix/smtps/smtpd[915291]: lost connection after AUTH from 77-45-85-95.sta.asta-net.com.pl[77.45.85.95]
Aug 15 01:24:17 mail.srvfarm.net postfix/smtpd[927804]: warning: 77-45-85-95.sta.asta-net.com.pl[77.45.85.95]: SASL PLAIN authentication failed: 
Aug 15 01:24:17 mail.srvfarm.net postfix/smtpd[927804]: lost connection after AUTH from 77-45-85-95.sta.asta-net.com.pl[77.45.85.95]
Aug 15 01:32:18 mail.srvfarm.net postfix/smtpd[929432]: warning: 77-45-85-95.sta.asta-net.com.pl[77.45.85.95]: SASL PLAIN authentication failed:
2020-08-15 14:06:33
5.69.54.109 attack
Automatic report - Port Scan Attack
2020-08-15 14:44:55
103.129.64.126 attack
Aug 15 01:29:46 mail.srvfarm.net postfix/smtpd[929438]: warning: unknown[103.129.64.126]: SASL PLAIN authentication failed: 
Aug 15 01:29:46 mail.srvfarm.net postfix/smtpd[929438]: lost connection after AUTH from unknown[103.129.64.126]
Aug 15 01:32:10 mail.srvfarm.net postfix/smtpd[929427]: warning: unknown[103.129.64.126]: SASL PLAIN authentication failed: 
Aug 15 01:32:10 mail.srvfarm.net postfix/smtpd[929427]: lost connection after AUTH from unknown[103.129.64.126]
Aug 15 01:34:18 mail.srvfarm.net postfix/smtps/smtpd[928606]: warning: unknown[103.129.64.126]: SASL PLAIN authentication failed:
2020-08-15 14:04:13
196.52.43.65 attackspambots
Port scan denied
2020-08-15 14:45:37
185.117.215.9 attackspam
Invalid user admin from 185.117.215.9 port 43024
2020-08-15 14:19:25
106.13.50.145 attackspambots
Aug 15 03:46:23 rush sshd[5269]: Failed password for root from 106.13.50.145 port 55444 ssh2
Aug 15 03:50:55 rush sshd[5420]: Failed password for root from 106.13.50.145 port 53658 ssh2
...
2020-08-15 14:46:43
219.135.209.164 attackspam
Lines containing failures of 219.135.209.164
Aug 13 19:21:36 linuxrulz sshd[4006]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=219.135.209.164  user=r.r
Aug 13 19:21:37 linuxrulz sshd[4006]: Failed password for r.r from 219.135.209.164 port 50633 ssh2
Aug 13 19:21:38 linuxrulz sshd[4006]: Received disconnect from 219.135.209.164 port 50633:11: Bye Bye [preauth]
Aug 13 19:21:38 linuxrulz sshd[4006]: Disconnected from authenticating user r.r 219.135.209.164 port 50633 [preauth]
Aug 13 19:36:59 linuxrulz sshd[5812]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=219.135.209.164  user=r.r
Aug 13 19:37:02 linuxrulz sshd[5812]: Failed password for r.r from 219.135.209.164 port 62514 ssh2
Aug 13 19:37:03 linuxrulz sshd[5812]: Received disconnect from 219.135.209.164 port 62514:11: Bye Bye [preauth]
Aug 13 19:37:03 linuxrulz sshd[5812]: Disconnected from authenticating user r.r 219.135.209.164 p........
------------------------------
2020-08-15 14:35:51
118.25.91.168 attackspambots
Failed password for root from 118.25.91.168 port 49086 ssh2
2020-08-15 14:08:28
144.64.3.101 attackspambots
frenzy
2020-08-15 14:16:49
94.102.49.159 attackbots
Aug 15 08:05:44 *hidden* kernel: [UFW BLOCK] IN=eth0 OUT= MAC=00:50:56:3e:4a:cc:28:99:3a:4d:23:91:08:00 SRC=94.102.49.159 DST=173.212.244.83 LEN=40 TOS=0x00 PREC=0x00 TTL=248 ID=41383 PROTO=TCP SPT=45696 DPT=22092 WINDOW=1024 RES=0x00 SYN URGP=0 Aug 15 08:10:49 *hidden* kernel: [UFW BLOCK] IN=eth0 OUT= MAC=00:50:56:3e:4a:cc:28:99:3a:4d:23:91:08:00 SRC=94.102.49.159 DST=173.212.244.83 LEN=40 TOS=0x00 PREC=0x00 TTL=248 ID=10752 PROTO=TCP SPT=45696 DPT=23476 WINDOW=1024 RES=0x00 SYN URGP=0 Aug 15 08:16:24 *hidden* kernel: [UFW BLOCK] IN=eth0 OUT= MAC=00:50:56:3e:4a:cc:28:99:3a:4d:23:91:08:00 SRC=94.102.49.159 DST=173.212.244.83 LEN=40 TOS=0x00 PREC=0x00 TTL=248 ID=52777 PROTO=TCP SPT=45696 DPT=22157 WINDOW=1024 RES=0x00 SYN URGP=0 Aug 15 08:20:06 *hidden* kernel: [UFW BLOCK] IN=eth0 OUT= MAC=00:50:56:3e:4a:cc:28:99:3a:4d:23:91:08:00 SRC=94.102.49.159 DST=173.212.244.83 LEN=40 TOS=0x00 PREC=0x00 TTL=248 ID=6156 PROTO=TCP SPT=45696 DPT=22139 WINDOW=1024 RES=0x00 SYN URGP=0 Aug 15 08:22:54 *
...
2020-08-15 14:33:48
141.98.9.137 attack
$f2bV_matches
2020-08-15 14:17:19
218.92.0.224 attack
2020-08-15T09:19:52.511604afi-git.jinr.ru sshd[16306]: Failed password for root from 218.92.0.224 port 4217 ssh2
2020-08-15T09:19:56.308287afi-git.jinr.ru sshd[16306]: Failed password for root from 218.92.0.224 port 4217 ssh2
2020-08-15T09:19:59.352567afi-git.jinr.ru sshd[16306]: Failed password for root from 218.92.0.224 port 4217 ssh2
2020-08-15T09:19:59.352722afi-git.jinr.ru sshd[16306]: error: maximum authentication attempts exceeded for root from 218.92.0.224 port 4217 ssh2 [preauth]
2020-08-15T09:19:59.352739afi-git.jinr.ru sshd[16306]: Disconnecting: Too many authentication failures [preauth]
...
2020-08-15 14:21:02
221.122.73.130 attackbots
Aug 15 08:18:05 fhem-rasp sshd[7621]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=221.122.73.130  user=root
Aug 15 08:18:08 fhem-rasp sshd[7621]: Failed password for root from 221.122.73.130 port 54334 ssh2
...
2020-08-15 14:33:22
45.14.148.141 attack
Port scan denied
2020-08-15 14:28:01
179.124.19.240 attackbots
Attempted Brute Force (dovecot)
2020-08-15 14:24:19

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