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: Czechia

Internet Service Provider: Ales Krepela - KREPNET

Hostname: unknown

Organization: unknown

Usage Type: Fixed Line ISP

Comments:
Type Details Datetime
attack
Sep 15 18:40:20 mail.srvfarm.net postfix/smtps/smtpd[2822043]: warning: unknown[93.99.4.23]: SASL PLAIN authentication failed: 
Sep 15 18:40:20 mail.srvfarm.net postfix/smtps/smtpd[2822043]: lost connection after AUTH from unknown[93.99.4.23]
Sep 15 18:40:50 mail.srvfarm.net postfix/smtps/smtpd[2827555]: warning: unknown[93.99.4.23]: SASL PLAIN authentication failed: 
Sep 15 18:40:50 mail.srvfarm.net postfix/smtps/smtpd[2827555]: lost connection after AUTH from unknown[93.99.4.23]
Sep 15 18:48:25 mail.srvfarm.net postfix/smtpd[2827929]: warning: unknown[93.99.4.23]: SASL PLAIN authentication failed:
2020-09-17 02:39:58
attack
Sep 15 18:40:20 mail.srvfarm.net postfix/smtps/smtpd[2822043]: warning: unknown[93.99.4.23]: SASL PLAIN authentication failed: 
Sep 15 18:40:20 mail.srvfarm.net postfix/smtps/smtpd[2822043]: lost connection after AUTH from unknown[93.99.4.23]
Sep 15 18:40:50 mail.srvfarm.net postfix/smtps/smtpd[2827555]: warning: unknown[93.99.4.23]: SASL PLAIN authentication failed: 
Sep 15 18:40:50 mail.srvfarm.net postfix/smtps/smtpd[2827555]: lost connection after AUTH from unknown[93.99.4.23]
Sep 15 18:48:25 mail.srvfarm.net postfix/smtpd[2827929]: warning: unknown[93.99.4.23]: SASL PLAIN authentication failed:
2020-09-16 18:58:53
attack
Brute force attempt
2020-05-24 01:29:57
Comments on same subnet:
IP Type Details Datetime
93.99.4.22 attackbotsspam
Aug 27 11:22:42 mail.srvfarm.net postfix/smtps/smtpd[1499868]: warning: unknown[93.99.4.22]: SASL PLAIN authentication failed: 
Aug 27 11:22:42 mail.srvfarm.net postfix/smtps/smtpd[1499868]: lost connection after AUTH from unknown[93.99.4.22]
Aug 27 11:24:17 mail.srvfarm.net postfix/smtps/smtpd[1499867]: warning: unknown[93.99.4.22]: SASL PLAIN authentication failed: 
Aug 27 11:24:17 mail.srvfarm.net postfix/smtps/smtpd[1499867]: lost connection after AUTH from unknown[93.99.4.22]
Aug 27 11:30:04 mail.srvfarm.net postfix/smtpd[1488223]: warning: unknown[93.99.4.22]: SASL PLAIN authentication failed:
2020-08-28 08:15:55
93.99.4.38 attackbots
SASL PLAIN auth failed: ruser=...
2020-07-17 06:37:07
93.99.4.22 attackspambots
Jul  9 13:50:53 mail.srvfarm.net postfix/smtpd[3819465]: warning: unknown[93.99.4.22]: SASL PLAIN authentication failed: 
Jul  9 13:50:53 mail.srvfarm.net postfix/smtpd[3819465]: lost connection after AUTH from unknown[93.99.4.22]
Jul  9 13:52:25 mail.srvfarm.net postfix/smtpd[3817751]: warning: unknown[93.99.4.22]: SASL PLAIN authentication failed: 
Jul  9 13:52:25 mail.srvfarm.net postfix/smtpd[3817751]: lost connection after AUTH from unknown[93.99.4.22]
Jul  9 13:56:23 mail.srvfarm.net postfix/smtpd[3825207]: warning: unknown[93.99.4.22]: SASL PLAIN authentication failed:
2020-07-10 01:07:15
93.99.4.22 attackspambots
(smtpauth) Failed SMTP AUTH login from 93.99.4.22 (CZ/Czechia/-): 1 in the last 3600 secs; Ports: *; Direction: inout; Trigger: LF_TRIGGER; Logs: 2020-05-10 08:25:06 plain authenticator failed for ([93.99.4.22]) [93.99.4.22]: 535 Incorrect authentication data (set_id=sale@emad-security.com)
2020-05-10 13:30:16
93.99.49.50 attackspambots
Unauthorized connection attempt detected from IP address 93.99.49.50 to port 23 [J]
2020-01-22 23:34:06
93.99.42.18 attack
Jul 15 08:16:01 rigel postfix/smtpd[31991]: warning: hostname 18pc.vranet.cz does not resolve to address 93.99.42.18
Jul 15 08:16:01 rigel postfix/smtpd[31991]: connect from unknown[93.99.42.18]
Jul 15 08:16:02 rigel postfix/smtpd[31991]: warning: unknown[93.99.42.18]: SASL CRAM-MD5 authentication failed: authentication failure
Jul 15 08:16:02 rigel postfix/smtpd[31991]: warning: unknown[93.99.42.18]: SASL PLAIN authentication failed: authentication failure
Jul 15 08:16:02 rigel postfix/smtpd[31991]: warning: unknown[93.99.42.18]: SASL LOGIN authentication failed: authentication failure
Jul 15 08:16:02 rigel postfix/smtpd[31991]: disconnect from unknown[93.99.42.18]


........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=93.99.42.18
2019-07-15 21:04:32
Whois info:
b
Dig info:
; <<>> DiG 9.10.3-P4-Ubuntu <<>> 93.99.4.23
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 36665
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

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

;; AUTHORITY SECTION:
.			494	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2020052301 1800 900 604800 86400

;; Query time: 91 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Sun May 24 01:29:52 CST 2020
;; MSG SIZE  rcvd: 114
Host info
Host 23.4.99.93.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 23.4.99.93.in-addr.arpa: NXDOMAIN
Related IP info:
Related comments:
IP Type Details Datetime
46.166.186.212 attack
Brute force attack stopped by firewall
2019-06-27 09:30:12
14.169.132.116 attackbotsspam
Jun 27 01:52:00 elektron postfix/smtpd\[25017\]: NOQUEUE: reject: RCPT from unknown\[14.169.132.116\]: 450 4.7.1 Client host rejected: cannot find your hostname, \[14.169.132.116\]\; from=\ to=\ proto=ESMTP helo=\<\[185.180.222.147\]\>
Jun 27 01:52:01 elektron postfix/smtpd\[25017\]: NOQUEUE: reject: RCPT from unknown\[14.169.132.116\]: 450 4.7.1 Client host rejected: cannot find your hostname, \[14.169.132.116\]\; from=\ to=\ proto=ESMTP helo=\<\[185.180.222.147\]\>
Jun 27 01:52:01 elektron postfix/smtpd\[25017\]: NOQUEUE: reject: RCPT from unknown\[14.169.132.116\]: 450 4.7.1 Client host rejected: cannot find your hostname, \[14.169.132.116\]\; from=\ to=\ proto=ESMTP helo=\<\[185.180.222.147\]\>
Jun 27 01:52:01 elektron postfix/smtpd\[25017\]: NOQUEUE: reject: RCPT from unknown\[14.169.132.116\]: 450 4.7.1 Client host rejected: cannot find your hostname, \[14.169.132.116\]\; from=\
2019-06-27 09:58:12
222.92.204.50 attack
Brute force attack stopped by firewall
2019-06-27 10:02:04
114.104.162.36 attackspam
Brute force attack to crack SMTP password (port 25 / 587)
2019-06-27 09:51:46
46.229.168.151 attackspambots
Brute force attack stopped by firewall
2019-06-27 10:11:03
60.2.15.52 attackspam
Brute force attack stopped by firewall
2019-06-27 10:05:48
202.138.252.160 attack
Sending SPAM email
2019-06-27 09:39:38
183.87.140.42 attackspam
Brute force attack stopped by firewall
2019-06-27 10:04:54
62.141.50.140 attack
ssh bruteforce or scan
...
2019-06-27 09:34:37
139.162.124.90 attackbotsspam
" "
2019-06-27 09:36:14
94.176.76.230 attackbots
(Jun 27)  LEN=40 TTL=244 ID=20457 DF TCP DPT=23 WINDOW=14600 SYN 
 (Jun 26)  LEN=40 TTL=244 ID=33816 DF TCP DPT=23 WINDOW=14600 SYN 
 (Jun 26)  LEN=40 TTL=244 ID=5381 DF TCP DPT=23 WINDOW=14600 SYN 
 (Jun 26)  LEN=40 TTL=244 ID=63249 DF TCP DPT=23 WINDOW=14600 SYN 
 (Jun 26)  LEN=40 TTL=244 ID=44444 DF TCP DPT=23 WINDOW=14600 SYN 
 (Jun 26)  LEN=40 TTL=244 ID=34414 DF TCP DPT=23 WINDOW=14600 SYN 
 (Jun 26)  LEN=40 TTL=244 ID=34405 DF TCP DPT=23 WINDOW=14600 SYN 
 (Jun 26)  LEN=40 TTL=244 ID=48897 DF TCP DPT=23 WINDOW=14600 SYN 
 (Jun 26)  LEN=40 TTL=244 ID=64615 DF TCP DPT=23 WINDOW=14600 SYN 
 (Jun 26)  LEN=40 TTL=244 ID=48119 DF TCP DPT=23 WINDOW=14600 SYN 
 (Jun 25)  LEN=40 TTL=244 ID=36405 DF TCP DPT=23 WINDOW=14600 SYN 
 (Jun 25)  LEN=40 TTL=244 ID=14361 DF TCP DPT=23 WINDOW=14600 SYN 
 (Jun 25)  LEN=40 TTL=244 ID=15961 DF TCP DPT=23 WINDOW=14600 SYN 
 (Jun 25)  LEN=40 TTL=244 ID=56525 DF TCP DPT=23 WINDOW=14600 SYN 
 (Jun 25)  LEN=40 TTL=244 ID=19483 DF TCP DPT=23 WINDOW=14600 S...
2019-06-27 09:40:48
108.178.61.58 attack
Brute force attack stopped by firewall
2019-06-27 09:42:37
220.164.2.123 attack
Brute force attack stopped by firewall
2019-06-27 09:54:17
185.234.219.124 attackbots
Brute force attack stopped by firewall
2019-06-27 09:37:01
118.107.233.29 attackspam
Jun 27 06:51:47 localhost sshd[24870]: Invalid user student from 118.107.233.29 port 60056
...
2019-06-27 10:07:06

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