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
attackspambots
Aug 23 17:35:48 pl1server postfix/smtpd[29723]: warning: hostname 191-53-52-66.vze-wr.mastercabo.com.br does not resolve to address 191.53.52.66: Name or service not known
Aug 23 17:35:48 pl1server postfix/smtpd[29723]: connect from unknown[191.53.52.66]
Aug 23 17:35:53 pl1server postfix/smtpd[29723]: warning: unknown[191.53.52.66]: SASL CRAM-MD5 authentication failed: authentication failure
Aug 23 17:35:53 pl1server postfix/smtpd[29723]: warning: unknown[191.53.52.66]: SASL PLAIN authentication failed: authentication failure
Aug 23 17:35:55 pl1server postfix/smtpd[29723]: warning: unknown[191.53.52.66]: SASL LOGIN authentication failed: authentication failure


........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=191.53.52.66
2019-08-24 08:14:36
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 <<>> 191.53.52.66
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 31704
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

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

;; AUTHORITY SECTION:
.			3600	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2019082302 1800 900 604800 86400

;; Query time: 2 msec
;; SERVER: 67.207.67.2#53(67.207.67.2)
;; WHEN: Sat Aug 24 08:14:31 CST 2019
;; MSG SIZE  rcvd: 116
Host info
66.52.53.191.in-addr.arpa domain name pointer 191-53-52-66.vze-wr.mastercabo.com.br.
Nslookup info:
Server:		67.207.67.2
Address:	67.207.67.2#53

Non-authoritative answer:
66.52.53.191.in-addr.arpa	name = 191-53-52-66.vze-wr.mastercabo.com.br.

Authoritative answers can be found from:
Related IP info:
Related comments:
IP Type Details Datetime
222.66.154.98 attack
Oct  4 20:50:47 mout sshd[20307]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.66.154.98  user=root
Oct  4 20:50:49 mout sshd[20307]: Failed password for root from 222.66.154.98 port 35266 ssh2
2020-10-05 02:51:37
195.154.176.37 attack
Automatic report - Banned IP Access
2020-10-05 02:19:13
157.245.178.61 attack
Cowrie Honeypot: 3 unauthorised SSH/Telnet login attempts between 2020-10-04T08:15:12Z and 2020-10-04T08:19:46Z
2020-10-05 02:32:02
222.138.148.164 attack
1601832911 - 10/04/2020 19:35:11 Host: 222.138.148.164/222.138.148.164 Port: 23 TCP Blocked
2020-10-05 02:46:04
190.1.203.180 attack
Oct  4 18:28:25 email sshd\[16657\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=190.1.203.180  user=root
Oct  4 18:28:27 email sshd\[16657\]: Failed password for root from 190.1.203.180 port 56394 ssh2
Oct  4 18:30:26 email sshd\[17050\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=190.1.203.180  user=root
Oct  4 18:30:28 email sshd\[17050\]: Failed password for root from 190.1.203.180 port 45932 ssh2
Oct  4 18:32:24 email sshd\[17431\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=190.1.203.180  user=root
...
2020-10-05 02:45:39
190.167.5.118 attack
Oct  4 20:14:24 eventyay sshd[3920]: Failed password for root from 190.167.5.118 port 37694 ssh2
Oct  4 20:18:06 eventyay sshd[4058]: Failed password for root from 190.167.5.118 port 40572 ssh2
...
2020-10-05 02:46:17
5.141.178.251 attackbots
Oct  4 01:36:48 gw1 sshd[21116]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=5.141.178.251
Oct  4 01:36:50 gw1 sshd[21116]: Failed password for invalid user nagesh from 5.141.178.251 port 58035 ssh2
...
2020-10-05 02:33:48
119.183.53.224 attackbotsspam
port
2020-10-05 02:25:57
119.28.84.19 attackspambots
2020-10-04T15:39:54+0200 Failed SSH Authentication/Brute Force Attack. (Server 4)
2020-10-05 02:46:46
174.219.11.190 attackspam
Brute forcing email accounts
2020-10-05 02:23:43
91.74.129.82 attackbots
Brute force attempt
2020-10-05 02:25:14
187.45.234.237 attack
Port probing on unauthorized port 1433
2020-10-05 02:30:00
74.120.14.38 attack
Oct  3 23:37:01 baraca inetd[61588]: refused connection from scanner-06.ch1.censys-scanner.com, service sshd (tcp)
Oct  3 23:37:02 baraca inetd[61589]: refused connection from scanner-06.ch1.censys-scanner.com, service sshd (tcp)
Oct  3 23:37:04 baraca inetd[61590]: refused connection from scanner-06.ch1.censys-scanner.com, service sshd (tcp)
...
2020-10-05 02:20:47
110.49.71.241 attackbotsspam
Oct  4 17:57:24 ncomp sshd[29540]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=110.49.71.241  user=root
Oct  4 17:57:26 ncomp sshd[29540]: Failed password for root from 110.49.71.241 port 58152 ssh2
Oct  4 18:12:07 ncomp sshd[29889]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=110.49.71.241  user=root
Oct  4 18:12:09 ncomp sshd[29889]: Failed password for root from 110.49.71.241 port 57915 ssh2
2020-10-05 02:53:42
115.61.136.120 attackbots
Icarus honeypot on github
2020-10-05 02:39:16

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