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: United States

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 <<>> 104.21.51.21
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 9124
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;104.21.51.21.			IN	A

;; AUTHORITY SECTION:
.			431	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2022021700 1800 900 604800 86400

;; Query time: 58 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Thu Feb 17 23:41:10 CST 2022
;; MSG SIZE  rcvd: 105
Host info
Host 21.51.21.104.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 21.51.21.104.in-addr.arpa: NXDOMAIN
Related IP info:
Related comments:
IP Type Details Datetime
213.6.8.38 attackbots
Apr  1 07:09:34 marvibiene sshd[14527]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=213.6.8.38  user=root
Apr  1 07:09:36 marvibiene sshd[14527]: Failed password for root from 213.6.8.38 port 58421 ssh2
Apr  1 07:15:46 marvibiene sshd[14582]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=213.6.8.38  user=root
Apr  1 07:15:48 marvibiene sshd[14582]: Failed password for root from 213.6.8.38 port 42442 ssh2
...
2020-04-01 16:18:45
66.181.164.159 attackbotsspam
Icarus honeypot on github
2020-04-01 16:23:00
139.198.5.79 attackbots
ssh brute force
2020-04-01 16:03:20
207.154.218.16 attack
Invalid user qub from 207.154.218.16 port 52522
2020-04-01 16:05:34
167.71.114.229 attack
xmlrpc attack
2020-04-01 15:55:12
152.136.218.35 attackspam
Mar 31 19:32:06 server sshd\[1533\]: Failed password for root from 152.136.218.35 port 52932 ssh2
Apr  1 10:47:33 server sshd\[1259\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=152.136.218.35  user=root
Apr  1 10:47:35 server sshd\[1259\]: Failed password for root from 152.136.218.35 port 55904 ssh2
Apr  1 10:55:29 server sshd\[3260\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=152.136.218.35  user=root
Apr  1 10:55:31 server sshd\[3260\]: Failed password for root from 152.136.218.35 port 52624 ssh2
...
2020-04-01 15:58:54
79.61.212.8 attack
SSH auth scanning - multiple failed logins
2020-04-01 16:16:07
114.234.183.147 attackspam
SpamScore above: 10.0
2020-04-01 16:08:29
192.241.169.184 attackspam
$f2bV_matches
2020-04-01 16:01:33
137.74.166.77 attackbotsspam
Apr  1 09:51:16 ns381471 sshd[15641]: Failed password for root from 137.74.166.77 port 54410 ssh2
2020-04-01 16:02:37
85.14.127.199 attackbotsspam
SSH brute force attempt
2020-04-01 16:26:21
51.68.190.223 attackspambots
Apr  1 05:45:56 ns382633 sshd\[11674\]: Invalid user ccvl from 51.68.190.223 port 35570
Apr  1 05:45:56 ns382633 sshd\[11674\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.68.190.223
Apr  1 05:45:58 ns382633 sshd\[11674\]: Failed password for invalid user ccvl from 51.68.190.223 port 35570 ssh2
Apr  1 05:51:35 ns382633 sshd\[12628\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=51.68.190.223  user=root
Apr  1 05:51:38 ns382633 sshd\[12628\]: Failed password for root from 51.68.190.223 port 57310 ssh2
2020-04-01 15:56:25
103.35.64.73 attackbotsspam
Apr  1 03:59:29 ny01 sshd[364]: Failed password for root from 103.35.64.73 port 33628 ssh2
Apr  1 04:01:54 ny01 sshd[638]: Failed password for root from 103.35.64.73 port 46602 ssh2
2020-04-01 16:13:52
167.99.70.191 attackspambots
xmlrpc attack
2020-04-01 16:01:17
193.56.28.104 attackbots
Apr  1 09:38:01 mout sshd[6905]: Invalid user admin from 193.56.28.104 port 52563
Apr  1 09:38:03 mout sshd[6905]: Failed password for invalid user admin from 193.56.28.104 port 52563 ssh2
Apr  1 09:38:03 mout sshd[6905]: error: Received disconnect from 193.56.28.104 port 52563:3: com.jcraft.jsch.JSchException: Auth fail [preauth]
2020-04-01 15:43:29

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