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: None

Internet Service Provider: unknown

Hostname: unknown

Organization: unknown

Usage Type: unknown

Comments:
No discussion about this IP yet. Click above link to make one.
Comments on same subnet:
No discussion about this subnet yet..
Whois info:
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Dig info:
; <<>> DiG 9.10.3-P4-Ubuntu <<>> 104.21.19.81
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 22502
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;104.21.19.81.			IN	A

;; AUTHORITY SECTION:
.			251	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2022021702 1800 900 604800 86400

;; Query time: 21 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Fri Feb 18 08:32:33 CST 2022
;; MSG SIZE  rcvd: 105
Host info
Host 81.19.21.104.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 81.19.21.104.in-addr.arpa: NXDOMAIN
Related IP info:
Related comments:
IP Type Details Datetime
186.189.224.80 attackspam
2020-06-15T15:04:20+0200 Failed SSH Authentication/Brute Force Attack. (Server 4)
2020-06-15 21:29:27
222.186.180.17 attack
Jun 15 15:45:02 pve1 sshd[13152]: Failed password for root from 222.186.180.17 port 41632 ssh2
Jun 15 15:45:07 pve1 sshd[13152]: Failed password for root from 222.186.180.17 port 41632 ssh2
...
2020-06-15 21:50:37
87.251.74.141 attackspambots
06/15/2020-08:21:20.716439 87.251.74.141 Protocol: 6 ET SCAN NMAP -sS window 1024
2020-06-15 21:21:52
120.196.120.110 attack
Jun 15 15:01:20 host sshd[29681]: Invalid user es from 120.196.120.110 port 2676
...
2020-06-15 21:12:19
116.110.220.55 attackbotsspam
20/6/15@08:20:54: FAIL: Alarm-Network address from=116.110.220.55
...
2020-06-15 21:49:51
142.93.235.47 attack
Jun 15 06:37:01 dignus sshd[16627]: Invalid user devserver from 142.93.235.47 port 53264
Jun 15 06:37:01 dignus sshd[16627]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=142.93.235.47
Jun 15 06:37:02 dignus sshd[16627]: Failed password for invalid user devserver from 142.93.235.47 port 53264 ssh2
Jun 15 06:40:37 dignus sshd[16962]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=142.93.235.47  user=root
Jun 15 06:40:39 dignus sshd[16962]: Failed password for root from 142.93.235.47 port 55274 ssh2
...
2020-06-15 21:44:43
66.55.70.122 attackbots
Jun 15 14:20:18 gestao sshd[17315]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=66.55.70.122 
Jun 15 14:20:20 gestao sshd[17315]: Failed password for invalid user janas from 66.55.70.122 port 48058 ssh2
Jun 15 14:23:39 gestao sshd[17324]: Failed password for root from 66.55.70.122 port 49342 ssh2
...
2020-06-15 21:24:03
221.233.90.90 attackbots
Jun 15 08:13:34 esmtp postfix/smtpd[28187]: lost connection after AUTH from unknown[221.233.90.90]
Jun 15 08:13:36 esmtp postfix/smtpd[28187]: lost connection after AUTH from unknown[221.233.90.90]
Jun 15 08:13:37 esmtp postfix/smtpd[28187]: lost connection after AUTH from unknown[221.233.90.90]
Jun 15 08:13:40 esmtp postfix/smtpd[28187]: lost connection after AUTH from unknown[221.233.90.90]
Jun 15 08:13:42 esmtp postfix/smtpd[28187]: lost connection after AUTH from unknown[221.233.90.90]

........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=221.233.90.90
2020-06-15 21:25:30
221.233.91.202 attackbotsspam
Jun 15 08:14:19 esmtp postfix/smtpd[28248]: lost connection after AUTH from unknown[221.233.91.202]
Jun 15 08:14:22 esmtp postfix/smtpd[28080]: lost connection after AUTH from unknown[221.233.91.202]
Jun 15 08:14:25 esmtp postfix/smtpd[28248]: lost connection after AUTH from unknown[221.233.91.202]
Jun 15 08:14:27 esmtp postfix/smtpd[28080]: lost connection after AUTH from unknown[221.233.91.202]
Jun 15 08:14:29 esmtp postfix/smtpd[28248]: lost connection after AUTH from unknown[221.233.91.202]

........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=221.233.91.202
2020-06-15 21:29:57
139.215.208.125 attackspambots
Lines containing failures of 139.215.208.125 (max 1000)
Jun 15 12:56:37 localhost sshd[16996]: User r.r from 139.215.208.125 not allowed because listed in DenyUsers
Jun 15 12:56:37 localhost sshd[16996]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=139.215.208.125  user=r.r
Jun 15 12:56:39 localhost sshd[16996]: Failed password for invalid user r.r from 139.215.208.125 port 35145 ssh2
Jun 15 12:56:39 localhost sshd[16996]: Received disconnect from 139.215.208.125 port 35145:11: Bye Bye [preauth]
Jun 15 12:56:39 localhost sshd[16996]: Disconnected from invalid user r.r 139.215.208.125 port 35145 [preauth]
Jun 15 13:12:40 localhost sshd[20034]: Invalid user newuser from 139.215.208.125 port 38259
Jun 15 13:12:40 localhost sshd[20034]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=139.215.208.125 
Jun 15 13:12:43 localhost sshd[20034]: Failed password for invalid user newuser from 139.215.2........
------------------------------
2020-06-15 21:47:55
144.76.176.171 attackbotsspam
20 attempts against mh-misbehave-ban on pluto
2020-06-15 21:10:44
141.98.81.42 attackbots
nft/Honeypot/22/73e86
2020-06-15 21:15:35
103.206.61.128 attackbotsspam
Unauthorised access (Jun 15) SRC=103.206.61.128 LEN=52 TTL=114 ID=7586 DF TCP DPT=445 WINDOW=8192 SYN
2020-06-15 21:21:18
106.54.19.67 attackbotsspam
2020-06-15T14:21:18.697604centos sshd[26929]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.54.19.67
2020-06-15T14:21:18.691350centos sshd[26929]: Invalid user student from 106.54.19.67 port 50250
2020-06-15T14:21:20.118041centos sshd[26929]: Failed password for invalid user student from 106.54.19.67 port 50250 ssh2
...
2020-06-15 21:20:42
141.98.81.6 attackspam
"fail2ban match"
2020-06-15 21:15:52

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