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: unknown

Region: unknown

Country: Singapore

Internet Service Provider: Microsoft Corporation

Hostname: unknown

Organization: unknown

Usage Type: Data Center/Web Hosting/Transit

Comments:
Type Details Datetime
attack
Jun 22 13:00:42 l03 postfix/smtps/smtpd[19977]: warning: unknown[52.163.121.142]: SASL LOGIN authentication failed: authentication failure
Jun 22 13:03:11 l03 postfix/smtps/smtpd[20817]: warning: unknown[52.163.121.142]: SASL LOGIN authentication failed: authentication failure
Jun 22 13:05:42 l03 postfix/smtps/smtpd[22363]: warning: unknown[52.163.121.142]: SASL LOGIN authentication failed: authentication failure
Jun 22 13:08:12 l03 postfix/smtps/smtpd[23166]: warning: unknown[52.163.121.142]: SASL LOGIN authentication failed: authentication failure
...
2020-06-22 20:19:07
Comments on same subnet:
IP Type Details Datetime
52.163.121.141 attackspam
Unauthorized connection attempt detected from IP address 52.163.121.141 to port 1433 [T]
2020-07-21 23:51:44
52.163.121.141 attackspambots
Jul 17 14:53:57 mockhub sshd[30397]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=52.163.121.141
Jul 17 14:54:00 mockhub sshd[30397]: Failed password for invalid user admin from 52.163.121.141 port 55844 ssh2
...
2020-07-18 06:03:54
52.163.121.141 attack
Jul 14 07:14:52 josie sshd[31446]: Invalid user josie from 52.163.121.141
Jul 14 07:14:52 josie sshd[31447]: Invalid user josie from 52.163.121.141
Jul 14 07:14:52 josie sshd[31447]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=52.163.121.141 
Jul 14 07:14:52 josie sshd[31446]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=52.163.121.141 
Jul 14 07:14:52 josie sshd[31451]: Invalid user josie from 52.163.121.141
Jul 14 07:14:52 josie sshd[31450]: Invalid user jabarchives from 52.163.121.141
Jul 14 07:14:52 josie sshd[31454]: Invalid user josie.jabarchives.com from 52.163.121.141
Jul 14 07:14:52 josie sshd[31452]: Invalid user jabarchives from 52.163.121.141
Jul 14 07:14:52 josie sshd[31453]: Invalid user jabarchives from 52.163.121.141
Jul 14 07:14:52 josie sshd[31455]: Invalid user jabarchives from 52.163.121.141
Jul 14 07:14:52 josie sshd[31456]: Invalid user josie from 52.163.121.141
........
-------------------------------
2020-07-15 23:59:44
Whois info:
b
Dig info:
; <<>> DiG 9.10.3-P4-Ubuntu <<>> 52.163.121.142
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 16962
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

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

;; AUTHORITY SECTION:
.			139	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2020062200 1800 900 604800 86400

;; Query time: 100 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Mon Jun 22 20:19:02 CST 2020
;; MSG SIZE  rcvd: 118
Host info
Host 142.121.163.52.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 142.121.163.52.in-addr.arpa: NXDOMAIN
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