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: Brazil

Internet Service Provider: Rede Brasileira de Comunicacao Ltda

Hostname: unknown

Organization: unknown

Usage Type: Fixed Line ISP

Comments:
Type Details Datetime
attackbotsspam
Jun 27 12:14:36 mail.srvfarm.net postfix/smtpd[3330525]: warning: unknown[191.53.52.100]: SASL PLAIN authentication failed: 
Jun 27 12:14:37 mail.srvfarm.net postfix/smtpd[3330525]: lost connection after AUTH from unknown[191.53.52.100]
Jun 27 12:17:18 mail.srvfarm.net postfix/smtps/smtpd[3331981]: warning: unknown[191.53.52.100]: SASL PLAIN authentication failed: 
Jun 27 12:17:19 mail.srvfarm.net postfix/smtps/smtpd[3331981]: lost connection after AUTH from unknown[191.53.52.100]
Jun 27 12:23:24 mail.srvfarm.net postfix/smtps/smtpd[3350216]: warning: unknown[191.53.52.100]: SASL PLAIN authentication failed:
2020-07-02 09:25:14
attack
$f2bV_matches
2019-07-24 23:43:18
attack
Lines containing failures of 191.53.52.100
2019-06-29 10:28:42 dovecot_plain authenticator failed for ([191.53.52.100]) [191.53.52.100]: 535 Incorrect authentication data (set_id=postmaster)


........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=191.53.52.100
2019-06-29 16:46:06
Comments on same subnet:
IP Type Details Datetime
191.53.52.220 attackspam
Attempted Brute Force (dovecot)
2020-10-14 03:05:10
191.53.52.220 attack
Attempted Brute Force (dovecot)
2020-10-13 18:21:29
191.53.52.96 attack
Sep 18 06:57:23 mail.srvfarm.net postfix/smtpd[591119]: warning: unknown[191.53.52.96]: SASL PLAIN authentication failed: 
Sep 18 06:57:24 mail.srvfarm.net postfix/smtpd[591119]: lost connection after AUTH from unknown[191.53.52.96]
Sep 18 06:58:54 mail.srvfarm.net postfix/smtpd[591128]: warning: unknown[191.53.52.96]: SASL PLAIN authentication failed: 
Sep 18 06:58:54 mail.srvfarm.net postfix/smtpd[591128]: lost connection after AUTH from unknown[191.53.52.96]
Sep 18 07:03:22 mail.srvfarm.net postfix/smtpd[608630]: warning: unknown[191.53.52.96]: SASL PLAIN authentication failed:
2020-09-19 01:58:38
191.53.52.96 attackbots
(smtpauth) Failed SMTP AUTH login from 191.53.52.96 (BR/Brazil/191-53-52-96.vze-wr.mastercabo.com.br): 1 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_TRIGGER; Logs: 2020-09-18 11:49:55 plain authenticator failed for ([191.53.52.96]) [191.53.52.96]: 535 Incorrect authentication data (set_id=info)
2020-09-18 17:55:59
191.53.52.20 attack
Sep 13 03:26:00 mail.srvfarm.net postfix/smtpd[891607]: warning: unknown[191.53.52.20]: SASL PLAIN authentication failed: 
Sep 13 03:26:01 mail.srvfarm.net postfix/smtpd[891607]: lost connection after AUTH from unknown[191.53.52.20]
Sep 13 03:26:26 mail.srvfarm.net postfix/smtps/smtpd[893602]: warning: unknown[191.53.52.20]: SASL PLAIN authentication failed: 
Sep 13 03:26:26 mail.srvfarm.net postfix/smtps/smtpd[893602]: lost connection after AUTH from unknown[191.53.52.20]
Sep 13 03:30:20 mail.srvfarm.net postfix/smtpd[891609]: warning: unknown[191.53.52.20]: SASL PLAIN authentication failed:
2020-09-14 01:34:49
191.53.52.20 attackbots
Sep 13 03:26:00 mail.srvfarm.net postfix/smtpd[891607]: warning: unknown[191.53.52.20]: SASL PLAIN authentication failed: 
Sep 13 03:26:01 mail.srvfarm.net postfix/smtpd[891607]: lost connection after AUTH from unknown[191.53.52.20]
Sep 13 03:26:26 mail.srvfarm.net postfix/smtps/smtpd[893602]: warning: unknown[191.53.52.20]: SASL PLAIN authentication failed: 
Sep 13 03:26:26 mail.srvfarm.net postfix/smtps/smtpd[893602]: lost connection after AUTH from unknown[191.53.52.20]
Sep 13 03:30:20 mail.srvfarm.net postfix/smtpd[891609]: warning: unknown[191.53.52.20]: SASL PLAIN authentication failed:
2020-09-13 17:28:34
191.53.52.137 attackbotsspam
Sep 11 18:35:28 mail.srvfarm.net postfix/smtps/smtpd[3892332]: warning: unknown[191.53.52.137]: SASL PLAIN authentication failed: 
Sep 11 18:35:29 mail.srvfarm.net postfix/smtps/smtpd[3892332]: lost connection after AUTH from unknown[191.53.52.137]
Sep 11 18:39:48 mail.srvfarm.net postfix/smtpd[3894593]: warning: unknown[191.53.52.137]: SASL PLAIN authentication failed: 
Sep 11 18:39:49 mail.srvfarm.net postfix/smtpd[3894593]: lost connection after AUTH from unknown[191.53.52.137]
Sep 11 18:44:03 mail.srvfarm.net postfix/smtpd[3893261]: warning: unknown[191.53.52.137]: SASL PLAIN authentication failed:
2020-09-13 01:33:22
191.53.52.137 attackspambots
Sep 11 18:35:28 mail.srvfarm.net postfix/smtps/smtpd[3892332]: warning: unknown[191.53.52.137]: SASL PLAIN authentication failed: 
Sep 11 18:35:29 mail.srvfarm.net postfix/smtps/smtpd[3892332]: lost connection after AUTH from unknown[191.53.52.137]
Sep 11 18:39:48 mail.srvfarm.net postfix/smtpd[3894593]: warning: unknown[191.53.52.137]: SASL PLAIN authentication failed: 
Sep 11 18:39:49 mail.srvfarm.net postfix/smtpd[3894593]: lost connection after AUTH from unknown[191.53.52.137]
Sep 11 18:44:03 mail.srvfarm.net postfix/smtpd[3893261]: warning: unknown[191.53.52.137]: SASL PLAIN authentication failed:
2020-09-12 17:32:34
191.53.52.57 attack
Brute force attempt
2020-09-06 22:50:55
191.53.52.57 attackbotsspam
Brute force attempt
2020-09-06 14:21:57
191.53.52.57 attackbotsspam
Brute force attempt
2020-09-06 06:32:03
191.53.52.206 attack
$f2bV_matches
2020-08-19 23:27:23
191.53.52.119 attackbotsspam
Email SMTP authentication failure
2020-08-14 17:48:13
191.53.52.126 attackspambots
mail brute force
2020-08-14 13:24:29
191.53.52.96 attackbotsspam
Unauthorized connection attempt
IP: 191.53.52.96
Ports affected
    Message Submission (587) 
Abuse Confidence rating 41%
Found in DNSBL('s)
ASN Details
   AS28202 Rede Brasileira de Comunicacao Ltda
   Brazil (BR)
   CIDR 191.53.0.0/16
Log Date: 10/08/2020 8:14:14 PM UTC
2020-08-11 06:31:26
Whois info:
b
Dig info:
; <<>> DiG 9.10.3-P4-Ubuntu <<>> 191.53.52.100
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 42236
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

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

;; AUTHORITY SECTION:
.			3600	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2019062900 1800 900 604800 86400

;; Query time: 2 msec
;; SERVER: 67.207.67.2#53(67.207.67.2)
;; WHEN: Sat Jun 29 16:45:54 CST 2019
;; MSG SIZE  rcvd: 117
Host info
100.52.53.191.in-addr.arpa domain name pointer 191-53-52-100.vze-wr.mastercabo.com.br.
Nslookup info:
Server:		67.207.67.2
Address:	67.207.67.2#53

Non-authoritative answer:
100.52.53.191.in-addr.arpa	name = 191-53-52-100.vze-wr.mastercabo.com.br.

Authoritative answers can be found from:
Related IP info:
Related comments:
IP Type Details Datetime
200.54.51.124 attack
(sshd) Failed SSH login from 200.54.51.124 (CL/Chile/-): 5 in the last 3600 secs
2020-10-09 16:19:17
186.90.97.124 attack
Unauthorized connection attempt from IP address 186.90.97.124 on Port 445(SMB)
2020-10-09 16:03:07
185.16.22.34 attack
Oct  8 15:55:03 hurricane sshd[30061]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=185.16.22.34  user=r.r
Oct  8 15:55:04 hurricane sshd[30061]: Failed password for r.r from 185.16.22.34 port 43496 ssh2
Oct  8 15:55:05 hurricane sshd[30061]: Received disconnect from 185.16.22.34 port 43496:11: Bye Bye [preauth]
Oct  8 15:55:05 hurricane sshd[30061]: Disconnected from 185.16.22.34 port 43496 [preauth]
Oct  8 16:08:59 hurricane sshd[30222]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=185.16.22.34  user=r.r
Oct  8 16:09:00 hurricane sshd[30222]: Failed password for r.r from 185.16.22.34 port 46110 ssh2
Oct  8 16:09:00 hurricane sshd[30222]: Received disconnect from 185.16.22.34 port 46110:11: Bye Bye [preauth]
Oct  8 16:09:00 hurricane sshd[30222]: Disconnected from 185.16.22.34 port 46110 [preauth]
Oct  8 16:14:07 hurricane sshd[30300]: Invalid user mdpi from 185.16.22.34 port 56564
Oc........
-------------------------------
2020-10-09 16:24:13
185.220.102.249 attack
Oct  9 10:18:23 lnxweb61 sshd[24672]: Failed password for root from 185.220.102.249 port 2620 ssh2
Oct  9 10:18:25 lnxweb61 sshd[24672]: Failed password for root from 185.220.102.249 port 2620 ssh2
Oct  9 10:18:27 lnxweb61 sshd[24672]: Failed password for root from 185.220.102.249 port 2620 ssh2
Oct  9 10:18:29 lnxweb61 sshd[24672]: Failed password for root from 185.220.102.249 port 2620 ssh2
2020-10-09 16:26:43
106.0.58.136 attack
Web scan/attack: detected 1 distinct attempts within a 12-hour window (GPON (CVE-2018-10561))
2020-10-09 16:05:45
61.133.232.254 attackspambots
Oct  9 08:49:59 server sshd[12187]: Failed password for invalid user postgresql from 61.133.232.254 port 32953 ssh2
Oct  9 09:00:05 server sshd[17797]: Failed password for invalid user rpc from 61.133.232.254 port 41888 ssh2
Oct  9 09:20:18 server sshd[29149]: Failed password for root from 61.133.232.254 port 3916 ssh2
2020-10-09 16:12:16
212.253.94.254 attackbotsspam
Port scan denied
2020-10-09 16:20:01
113.163.189.112 attackbotsspam
Unauthorized connection attempt from IP address 113.163.189.112 on Port 445(SMB)
2020-10-09 16:28:12
190.85.50.62 attack
Unauthorized connection attempt from IP address 190.85.50.62 on Port 445(SMB)
2020-10-09 16:33:19
174.217.12.25 attackbotsspam
Brute forcing email accounts
2020-10-09 16:16:52
40.77.30.252 attackbotsspam
Oct  9 08:40:31 sshgateway sshd\[23875\]: Invalid user nicki from 40.77.30.252
Oct  9 08:40:31 sshgateway sshd\[23875\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=40.77.30.252
Oct  9 08:40:34 sshgateway sshd\[23875\]: Failed password for invalid user nicki from 40.77.30.252 port 38554 ssh2
2020-10-09 16:45:15
113.23.48.103 attackspam
Unauthorized connection attempt from IP address 113.23.48.103 on Port 445(SMB)
2020-10-09 16:36:01
37.57.18.232 attack
Unauthorized connection attempt from IP address 37.57.18.232 on Port 445(SMB)
2020-10-09 16:40:30
218.92.0.172 attack
"Unauthorized connection attempt on SSHD detected"
2020-10-09 16:27:44
167.71.237.73 attackspambots
SSH login attempts.
2020-10-09 16:10:45

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