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: Switzerland

Internet Service Provider: Microsoft Limited

Hostname: unknown

Organization: unknown

Usage Type: Data Center/Web Hosting/Transit

Comments:
Type Details Datetime
attackbots
Jun 18 17:56:28 web01.agentur-b-2.de postfix/smtps/smtpd[106312]: warning: unknown[51.107.91.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 18 17:58:17 web01.agentur-b-2.de postfix/smtps/smtpd[106312]: warning: unknown[51.107.91.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 18 18:00:06 web01.agentur-b-2.de postfix/smtps/smtpd[107502]: warning: unknown[51.107.91.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 18 18:01:45 web01.agentur-b-2.de postfix/smtps/smtpd[119187]: warning: unknown[51.107.91.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 18 18:03:25 web01.agentur-b-2.de postfix/smtps/smtpd[107502]: warning: unknown[51.107.91.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
2020-06-19 00:57:44
attackbots
Jun 18 05:24:52 web01.agentur-b-2.de postfix/smtps/smtpd[1025952]: warning: unknown[51.107.91.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 18 05:26:40 web01.agentur-b-2.de postfix/smtps/smtpd[1026315]: warning: unknown[51.107.91.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 18 05:28:28 web01.agentur-b-2.de postfix/smtps/smtpd[1026552]: warning: unknown[51.107.91.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 18 05:30:17 web01.agentur-b-2.de postfix/smtps/smtpd[1026807]: warning: unknown[51.107.91.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Jun 18 05:32:05 web01.agentur-b-2.de postfix/smtps/smtpd[1027042]: warning: unknown[51.107.91.54]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
2020-06-18 16:39:01
Comments on same subnet:
No discussion about this subnet yet..
Whois info:
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Dig info:
; <<>> DiG 9.10.3-P4-Ubuntu <<>> 51.107.91.54
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 26994
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

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

;; AUTHORITY SECTION:
.			262	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2020061800 1800 900 604800 86400

;; Query time: 73 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Thu Jun 18 16:38:58 CST 2020
;; MSG SIZE  rcvd: 116
Host info
Host 54.91.107.51.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 54.91.107.51.in-addr.arpa: NXDOMAIN
Related IP info:
Related comments:
IP Type Details Datetime
212.47.250.50 attackspambots
Sep 12 09:49:51 web1 sshd\[19032\]: Invalid user mc from 212.47.250.50
Sep 12 09:49:51 web1 sshd\[19032\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=212.47.250.50
Sep 12 09:49:53 web1 sshd\[19032\]: Failed password for invalid user mc from 212.47.250.50 port 39938 ssh2
Sep 12 09:50:59 web1 sshd\[19123\]: Invalid user localhost from 212.47.250.50
Sep 12 09:50:59 web1 sshd\[19123\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=212.47.250.50
2019-09-13 06:37:28
182.61.59.143 attack
Sep 12 17:46:35 nextcloud sshd\[30843\]: Invalid user git from 182.61.59.143
Sep 12 17:46:35 nextcloud sshd\[30843\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=182.61.59.143
Sep 12 17:46:38 nextcloud sshd\[30843\]: Failed password for invalid user git from 182.61.59.143 port 64752 ssh2
...
2019-09-13 06:53:08
213.183.101.89 attackbotsspam
Sep 13 04:36:43 itv-usvr-01 sshd[26181]: Invalid user hadoopuser from 213.183.101.89
Sep 13 04:36:43 itv-usvr-01 sshd[26181]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=213.183.101.89
Sep 13 04:36:43 itv-usvr-01 sshd[26181]: Invalid user hadoopuser from 213.183.101.89
Sep 13 04:36:44 itv-usvr-01 sshd[26181]: Failed password for invalid user hadoopuser from 213.183.101.89 port 36264 ssh2
Sep 13 04:40:53 itv-usvr-01 sshd[26421]: Invalid user newuser from 213.183.101.89
2019-09-13 06:32:43
114.40.145.133 attack
scan z
2019-09-13 06:52:52
164.132.47.139 attackspam
$f2bV_matches
2019-09-13 06:49:42
115.47.160.19 attackbotsspam
Sep 12 17:52:37 mail sshd\[32137\]: Invalid user tomcat from 115.47.160.19 port 54852
Sep 12 17:52:37 mail sshd\[32137\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=115.47.160.19
Sep 12 17:52:39 mail sshd\[32137\]: Failed password for invalid user tomcat from 115.47.160.19 port 54852 ssh2
Sep 12 17:57:27 mail sshd\[32686\]: Invalid user ubuntu from 115.47.160.19 port 60124
Sep 12 17:57:27 mail sshd\[32686\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=115.47.160.19
2019-09-13 06:34:16
81.133.189.239 attack
Sep 12 18:15:41 TORMINT sshd\[24138\]: Invalid user developer from 81.133.189.239
Sep 12 18:15:41 TORMINT sshd\[24138\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=81.133.189.239
Sep 12 18:15:43 TORMINT sshd\[24138\]: Failed password for invalid user developer from 81.133.189.239 port 58940 ssh2
...
2019-09-13 06:16:30
95.58.194.148 attackbots
Jan 30 05:05:53 vtv3 sshd\[29922\]: Invalid user weblogic from 95.58.194.148 port 36404
Jan 30 05:05:53 vtv3 sshd\[29922\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=95.58.194.148
Jan 30 05:05:56 vtv3 sshd\[29922\]: Failed password for invalid user weblogic from 95.58.194.148 port 36404 ssh2
Jan 30 05:10:48 vtv3 sshd\[31291\]: Invalid user teste from 95.58.194.148 port 40378
Jan 30 05:10:48 vtv3 sshd\[31291\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=95.58.194.148
Jan 30 07:20:03 vtv3 sshd\[1829\]: Invalid user testuser from 95.58.194.148 port 54738
Jan 30 07:20:03 vtv3 sshd\[1829\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=95.58.194.148
Jan 30 07:20:05 vtv3 sshd\[1829\]: Failed password for invalid user testuser from 95.58.194.148 port 54738 ssh2
Jan 30 07:24:54 vtv3 sshd\[3142\]: Invalid user kafka from 95.58.194.148 port 58512
Jan 30 07:24:54 vtv3 sshd\[3142\]
2019-09-13 06:53:31
159.203.197.24 attack
Unauthorized connection attempt from IP address 159.203.197.24 on Port 139(NETBIOS)
2019-09-13 06:42:50
186.5.109.211 attackspambots
Sep 12 21:55:37 [host] sshd[12433]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=186.5.109.211  user=www-data
Sep 12 21:55:38 [host] sshd[12433]: Failed password for www-data from 186.5.109.211 port 26480 ssh2
Sep 12 22:00:07 [host] sshd[12469]: Invalid user test from 186.5.109.211
2019-09-13 06:31:57
171.110.83.42 attackbotsspam
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x
2019-09-12 x@x

........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=171.110.83.42
2019-09-13 06:32:24
180.97.220.246 attackspam
3 pkts, ports: TCP:22
2019-09-13 06:41:03
95.71.49.112 attack
445/tcp
[2019-09-12]1pkt
2019-09-13 06:36:10
51.91.38.180 attackbotsspam
$f2bV_matches
2019-09-13 06:14:21
170.80.227.56 attackspambots
Sep 12 16:38:04 xb3 sshd[19947]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=170.80.227.56  user=r.r
Sep 12 16:38:07 xb3 sshd[19947]: Failed password for r.r from 170.80.227.56 port 35383 ssh2
Sep 12 16:38:09 xb3 sshd[19947]: Failed password for r.r from 170.80.227.56 port 35383 ssh2
Sep 12 16:38:11 xb3 sshd[19947]: Failed password for r.r from 170.80.227.56 port 35383 ssh2
Sep 12 16:38:11 xb3 sshd[19947]: Disconnecting: Too many authentication failures for r.r from 170.80.227.56 port 35383 ssh2 [preauth]
Sep 12 16:38:11 xb3 sshd[19947]: PAM 2 more authentication failures; logname= uid=0 euid=0 tty=ssh ruser= rhost=170.80.227.56  user=r.r
Sep 12 16:38:15 xb3 sshd[22762]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=170.80.227.56  user=r.r
Sep 12 16:38:17 xb3 sshd[22762]: Failed password for r.r from 170.80.227.56 port 35395 ssh2
Sep 12 16:38:20 xb3 sshd[22762]: Failed password for r.r........
-------------------------------
2019-09-13 06:38:28

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