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: WI - Provedor de Telecomunicacoes Ltda.

Hostname: unknown

Organization: unknown

Usage Type: Fixed Line ISP

Comments:
Type Details Datetime
attack
May 20 17:46:49 mail.srvfarm.net postfix/smtps/smtpd[1512859]: warning: 201-55-158-21.witelecom.com.br[201.55.158.21]: SASL PLAIN authentication failed: 
May 20 17:46:50 mail.srvfarm.net postfix/smtps/smtpd[1512859]: lost connection after AUTH from 201-55-158-21.witelecom.com.br[201.55.158.21]
May 20 17:51:02 mail.srvfarm.net postfix/smtpd[1512862]: warning: 201-55-158-21.witelecom.com.br[201.55.158.21]: SASL PLAIN authentication failed: 
May 20 17:51:02 mail.srvfarm.net postfix/smtpd[1512862]: lost connection after AUTH from 201-55-158-21.witelecom.com.br[201.55.158.21]
May 20 17:54:07 mail.srvfarm.net postfix/smtps/smtpd[1510940]: warning: 201-55-158-21.witelecom.com.br[201.55.158.21]: SASL PLAIN authentication failed:
2020-05-21 00:51:00
Comments on same subnet:
IP Type Details Datetime
201.55.158.55 attack
email brute force
2020-09-17 02:42:58
201.55.158.55 attackspambots
Sep 15 18:24:03 mail.srvfarm.net postfix/smtps/smtpd[2819938]: warning: 201-55-158-55.witelecom.com.br[201.55.158.55]: SASL PLAIN authentication failed: 
Sep 15 18:24:03 mail.srvfarm.net postfix/smtps/smtpd[2819938]: lost connection after AUTH from 201-55-158-55.witelecom.com.br[201.55.158.55]
Sep 15 18:26:53 mail.srvfarm.net postfix/smtps/smtpd[2805670]: warning: 201-55-158-55.witelecom.com.br[201.55.158.55]: SASL PLAIN authentication failed: 
Sep 15 18:26:54 mail.srvfarm.net postfix/smtps/smtpd[2805670]: lost connection after AUTH from 201-55-158-55.witelecom.com.br[201.55.158.55]
Sep 15 18:33:12 mail.srvfarm.net postfix/smtps/smtpd[2818213]: warning: 201-55-158-55.witelecom.com.br[201.55.158.55]: SASL PLAIN authentication failed:
2020-09-16 19:02:23
201.55.158.228 attackbotsspam
Sep 12 21:11:40 mail.srvfarm.net postfix/smtps/smtpd[610610]: warning: 201-55-158-228.witelecom.com.br[201.55.158.228]: SASL PLAIN authentication failed: 
Sep 12 21:11:40 mail.srvfarm.net postfix/smtps/smtpd[610610]: lost connection after AUTH from 201-55-158-228.witelecom.com.br[201.55.158.228]
Sep 12 21:17:02 mail.srvfarm.net postfix/smtps/smtpd[596783]: warning: 201-55-158-228.witelecom.com.br[201.55.158.228]: SASL PLAIN authentication failed: 
Sep 12 21:17:02 mail.srvfarm.net postfix/smtps/smtpd[596783]: lost connection after AUTH from 201-55-158-228.witelecom.com.br[201.55.158.228]
Sep 12 21:17:13 mail.srvfarm.net postfix/smtps/smtpd[597331]: warning: 201-55-158-228.witelecom.com.br[201.55.158.228]: SASL PLAIN authentication failed:
2020-09-14 01:32:43
201.55.158.228 attack
Sep 12 21:11:40 mail.srvfarm.net postfix/smtps/smtpd[610610]: warning: 201-55-158-228.witelecom.com.br[201.55.158.228]: SASL PLAIN authentication failed: 
Sep 12 21:11:40 mail.srvfarm.net postfix/smtps/smtpd[610610]: lost connection after AUTH from 201-55-158-228.witelecom.com.br[201.55.158.228]
Sep 12 21:17:02 mail.srvfarm.net postfix/smtps/smtpd[596783]: warning: 201-55-158-228.witelecom.com.br[201.55.158.228]: SASL PLAIN authentication failed: 
Sep 12 21:17:02 mail.srvfarm.net postfix/smtps/smtpd[596783]: lost connection after AUTH from 201-55-158-228.witelecom.com.br[201.55.158.228]
Sep 12 21:17:13 mail.srvfarm.net postfix/smtps/smtpd[597331]: warning: 201-55-158-228.witelecom.com.br[201.55.158.228]: SASL PLAIN authentication failed:
2020-09-13 17:26:14
201.55.158.225 attackbots
Aug 11 13:55:53 mail.srvfarm.net postfix/smtps/smtpd[2364251]: warning: 201-55-158-225.witelecom.com.br[201.55.158.225]: SASL PLAIN authentication failed: 
Aug 11 13:55:53 mail.srvfarm.net postfix/smtps/smtpd[2364251]: lost connection after AUTH from 201-55-158-225.witelecom.com.br[201.55.158.225]
Aug 11 13:56:01 mail.srvfarm.net postfix/smtps/smtpd[2366576]: warning: 201-55-158-225.witelecom.com.br[201.55.158.225]: SASL PLAIN authentication failed: 
Aug 11 13:56:01 mail.srvfarm.net postfix/smtps/smtpd[2366576]: lost connection after AUTH from 201-55-158-225.witelecom.com.br[201.55.158.225]
Aug 11 14:01:31 mail.srvfarm.net postfix/smtps/smtpd[2367144]: warning: 201-55-158-225.witelecom.com.br[201.55.158.225]: SASL PLAIN authentication failed:
2020-08-12 03:30:05
201.55.158.169 attackspam
Jun 18 05:12:42 mail.srvfarm.net postfix/smtps/smtpd[1338969]: warning: 201-55-158-169.witelecom.com.br[201.55.158.169]: SASL PLAIN authentication failed: 
Jun 18 05:12:42 mail.srvfarm.net postfix/smtps/smtpd[1338969]: lost connection after AUTH from 201-55-158-169.witelecom.com.br[201.55.158.169]
Jun 18 05:13:35 mail.srvfarm.net postfix/smtpd[1337038]: warning: 201-55-158-169.witelecom.com.br[201.55.158.169]: SASL PLAIN authentication failed: 
Jun 18 05:13:36 mail.srvfarm.net postfix/smtpd[1337038]: lost connection after AUTH from 201-55-158-169.witelecom.com.br[201.55.158.169]
Jun 18 05:19:08 mail.srvfarm.net postfix/smtpd[1339651]: warning: 201-55-158-169.witelecom.com.br[201.55.158.169]: SASL PLAIN authentication failed:
2020-06-18 16:41:12
201.55.158.113 attackbotsspam
(BR/Brazil/-) SMTP Bruteforcing attempts
2020-06-05 17:42:07
201.55.158.87 attack
(BR/Brazil/-) SMTP Bruteforcing attempts
2020-06-05 17:38:25
201.55.158.242 attackspambots
Jun  4 13:43:49 mail.srvfarm.net postfix/smtpd[2497905]: warning: 201-55-158-242.witelecom.com.br[201.55.158.242]: SASL PLAIN authentication failed: 
Jun  4 13:43:50 mail.srvfarm.net postfix/smtpd[2497905]: lost connection after AUTH from 201-55-158-242.witelecom.com.br[201.55.158.242]
Jun  4 13:51:32 mail.srvfarm.net postfix/smtpd[2502236]: warning: 201-55-158-242.witelecom.com.br[201.55.158.242]: SASL PLAIN authentication failed: 
Jun  4 13:51:32 mail.srvfarm.net postfix/smtpd[2502236]: lost connection after AUTH from 201-55-158-242.witelecom.com.br[201.55.158.242]
Jun  4 13:52:13 mail.srvfarm.net postfix/smtps/smtpd[2498108]: warning: 201-55-158-242.witelecom.com.br[201.55.158.242]: SASL PLAIN authentication failed:
2020-06-05 03:18:55
201.55.158.46 attackbots
Brute forcing email accounts
2020-05-10 05:02:42
201.55.158.2 attackspambots
SpamScore above: 10.0
2020-03-25 10:05:05
201.55.158.155 attackbots
Sep  5 22:52:02 mailman postfix/smtpd[12837]: warning: 201-55-158-155.witelecom.com.br[201.55.158.155]: SASL PLAIN authentication failed: authentication failure
2019-09-06 17:55:04
201.55.158.171 attackspambots
Sep  5 14:11:06 mailman postfix/smtpd[29743]: warning: 201-55-158-171.witelecom.com.br[201.55.158.171]: SASL PLAIN authentication failed: authentication failure
2019-09-06 03:49:34
201.55.158.62 attackbotsspam
Excessive failed login attempts on port 25
2019-09-03 17:15:51
201.55.158.28 attackspambots
SASL PLAIN auth failed: ruser=...
2019-08-19 12:06:02
Whois info:
b
Dig info:
; <<>> DiG 9.10.3-P4-Ubuntu <<>> 201.55.158.21
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 15887
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

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

;; AUTHORITY SECTION:
.			491	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2020052000 1800 900 604800 86400

;; Query time: 90 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Thu May 21 00:50:51 CST 2020
;; MSG SIZE  rcvd: 117
Host info
21.158.55.201.in-addr.arpa domain name pointer 201-55-158-21.witelecom.com.br.
Nslookup info:
Server:		183.60.83.19
Address:	183.60.83.19#53

Non-authoritative answer:
21.158.55.201.in-addr.arpa	name = 201-55-158-21.witelecom.com.br.

Authoritative answers can be found from:
Related IP info:
Related comments:
IP Type Details Datetime
104.248.183.0 attack
Apr 17 21:11:32 ubuntu sshd[28067]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=104.248.183.0
Apr 17 21:11:35 ubuntu sshd[28067]: Failed password for invalid user justin from 104.248.183.0 port 58094 ssh2
Apr 17 21:13:55 ubuntu sshd[29067]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=104.248.183.0
Apr 17 21:13:57 ubuntu sshd[29067]: Failed password for invalid user ban from 104.248.183.0 port 55556 ssh2
2019-07-31 19:14:10
223.30.41.146 attack
Unauthorized connection attempt from IP address 223.30.41.146 on Port 445(SMB)
2019-07-31 19:09:05
42.118.54.114 attackspambots
Unauthorized connection attempt from IP address 42.118.54.114 on Port 445(SMB)
2019-07-31 18:55:27
222.254.7.26 attackspam
Unauthorized connection attempt from IP address 222.254.7.26 on Port 445(SMB)
2019-07-31 19:21:08
14.231.190.209 attackspambots
Unauthorized connection attempt from IP address 14.231.190.209 on Port 445(SMB)
2019-07-31 18:47:04
104.248.181.166 attack
$f2bV_matches
2019-07-31 19:21:39
14.248.83.214 attack
Unauthorized connection attempt from IP address 14.248.83.214 on Port 445(SMB)
2019-07-31 19:16:08
12.38.141.131 attack
Unauthorized connection attempt from IP address 12.38.141.131 on Port 445(SMB)
2019-07-31 18:58:54
37.187.6.235 attackspam
Jul 31 12:31:32 SilenceServices sshd[23671]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=37.187.6.235
Jul 31 12:31:34 SilenceServices sshd[23671]: Failed password for invalid user tsbot from 37.187.6.235 port 53536 ssh2
Jul 31 12:36:26 SilenceServices sshd[27631]: Failed password for root from 37.187.6.235 port 49056 ssh2
2019-07-31 19:00:23
218.92.0.205 attackspam
Jul 31 13:16:38 eventyay sshd[24669]: Failed password for root from 218.92.0.205 port 24307 ssh2
Jul 31 13:18:05 eventyay sshd[24925]: Failed password for root from 218.92.0.205 port 63075 ssh2
...
2019-07-31 19:31:47
103.88.221.51 attack
Invalid user luke from 103.88.221.51 port 43066
2019-07-31 18:52:46
206.189.108.59 attackspambots
Jul 31 12:38:53 mout sshd[22627]: Connection closed by 206.189.108.59 port 60494 [preauth]
2019-07-31 19:28:16
159.203.26.156 attackbots
michaelklotzbier.de 159.203.26.156 \[31/Jul/2019:10:26:25 +0200\] "POST /wp-login.php HTTP/1.1" 200 5838 "-" "Mozilla/5.0 \(X11\; Ubuntu\; Linux x86_64\; rv:62.0\) Gecko/20100101 Firefox/62.0"
michaelklotzbier.de 159.203.26.156 \[31/Jul/2019:10:26:26 +0200\] "POST /wp-login.php HTTP/1.1" 200 5838 "-" "Mozilla/5.0 \(X11\; Ubuntu\; Linux x86_64\; rv:62.0\) Gecko/20100101 Firefox/62.0"
2019-07-31 19:00:59
41.34.169.175 attack
Unauthorised access (Jul 31) SRC=41.34.169.175 LEN=52 TOS=0x08 PREC=0x20 TTL=45 ID=15438 DF TCP DPT=445 WINDOW=8192 SYN
2019-07-31 19:17:15
49.248.73.138 attackspam
Unauthorized connection attempt from IP address 49.248.73.138 on Port 445(SMB)
2019-07-31 18:55:55

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