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 <<>> 104.21.57.81
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 32566
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;104.21.57.81.			IN	A

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

;; Query time: 15 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Fri Feb 18 00:36:15 CST 2022
;; MSG SIZE  rcvd: 105
Host info
Host 81.57.21.104.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 81.57.21.104.in-addr.arpa: NXDOMAIN
Related IP info:
Related comments:
IP Type Details Datetime
206.81.16.252 attackbotsspam
LGS,WP GET /wp-login.php
2020-09-06 05:01:32
45.145.67.39 attackspambots
3341/tcp 3000/tcp 4000/tcp...
[2020-08-12/09-05]284pkt,86pt.(tcp)
2020-09-06 05:07:27
106.54.123.84 attackbotsspam
2020-09-05T17:43:49.862101shield sshd\[22121\]: Invalid user emily from 106.54.123.84 port 36456
2020-09-05T17:43:49.871337shield sshd\[22121\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.54.123.84
2020-09-05T17:43:52.161300shield sshd\[22121\]: Failed password for invalid user emily from 106.54.123.84 port 36456 ssh2
2020-09-05T17:45:24.224832shield sshd\[22259\]: Invalid user zt from 106.54.123.84 port 52580
2020-09-05T17:45:24.234498shield sshd\[22259\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.54.123.84
2020-09-06 05:19:56
188.26.125.126 attack
Automatic report - Banned IP Access
2020-09-06 05:07:44
183.166.137.124 attackbots
Sep  5 19:41:29 srv01 postfix/smtpd\[30709\]: warning: unknown\[183.166.137.124\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Sep  5 19:41:41 srv01 postfix/smtpd\[30709\]: warning: unknown\[183.166.137.124\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Sep  5 19:41:57 srv01 postfix/smtpd\[30709\]: warning: unknown\[183.166.137.124\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Sep  5 19:42:17 srv01 postfix/smtpd\[30709\]: warning: unknown\[183.166.137.124\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Sep  5 19:42:28 srv01 postfix/smtpd\[30709\]: warning: unknown\[183.166.137.124\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...
2020-09-06 04:51:01
85.206.165.172 attackspam
malicious Brute-Force reported by https://www.patrick-binder.de
...
2020-09-06 05:16:42
184.105.247.231 attackspambots
srv02 Mass scanning activity detected Target: 9200  ..
2020-09-06 05:14:12
49.233.31.121 attackbots
SSH Login Bruteforce
2020-09-06 05:11:58
193.169.253.138 attack
Sep  5 22:44:50 srv01 postfix/smtpd\[12513\]: warning: unknown\[193.169.253.138\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Sep  5 22:44:56 srv01 postfix/smtpd\[12513\]: warning: unknown\[193.169.253.138\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Sep  5 22:45:07 srv01 postfix/smtpd\[12513\]: warning: unknown\[193.169.253.138\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Sep  5 22:45:31 srv01 postfix/smtpd\[15481\]: warning: unknown\[193.169.253.138\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
Sep  5 22:45:38 srv01 postfix/smtpd\[12513\]: warning: unknown\[193.169.253.138\]: SASL LOGIN authentication failed: UGFzc3dvcmQ6
...
2020-09-06 05:06:20
222.186.173.142 attackspambots
Sep  5 22:47:42 nextcloud sshd\[13270\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.173.142  user=root
Sep  5 22:47:44 nextcloud sshd\[13270\]: Failed password for root from 222.186.173.142 port 30550 ssh2
Sep  5 22:48:01 nextcloud sshd\[13589\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=222.186.173.142  user=root
2020-09-06 04:49:27
128.199.204.26 attackspambots
2020-09-05T21:43:36.442208snf-827550 sshd[2103]: Failed password for invalid user cron from 128.199.204.26 port 50448 ssh2
2020-09-05T21:51:11.849855snf-827550 sshd[2138]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=128.199.204.26  user=root
2020-09-05T21:51:13.703555snf-827550 sshd[2138]: Failed password for root from 128.199.204.26 port 57048 ssh2
...
2020-09-06 05:15:24
101.71.51.192 attackspam
Sep  5 20:53:39 onepixel sshd[2000376]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=101.71.51.192 
Sep  5 20:53:39 onepixel sshd[2000376]: Invalid user jennie from 101.71.51.192 port 60854
Sep  5 20:53:41 onepixel sshd[2000376]: Failed password for invalid user jennie from 101.71.51.192 port 60854 ssh2
Sep  5 20:56:26 onepixel sshd[2000818]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=101.71.51.192  user=root
Sep  5 20:56:28 onepixel sshd[2000818]: Failed password for root from 101.71.51.192 port 52376 ssh2
2020-09-06 05:10:27
162.214.111.167 attackbots
" "
2020-09-06 05:22:34
218.92.0.251 attackbots
Sep  5 22:54:03 prod4 sshd\[27473\]: Failed password for root from 218.92.0.251 port 55050 ssh2
Sep  5 22:54:06 prod4 sshd\[27473\]: Failed password for root from 218.92.0.251 port 55050 ssh2
Sep  5 22:54:09 prod4 sshd\[27473\]: Failed password for root from 218.92.0.251 port 55050 ssh2
...
2020-09-06 04:56:16
45.143.223.106 attackbotsspam
[2020-09-05 17:13:14] NOTICE[1194][C-00000f3f] chan_sip.c: Call from '' (45.143.223.106:63929) to extension '00441904911024' rejected because extension not found in context 'public'.
[2020-09-05 17:13:14] SECURITY[1233] res_security_log.c: SecurityEvent="FailedACL",EventTV="2020-09-05T17:13:14.866-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="00441904911024",SessionID="0x7f2ddc0f4e48",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP/45.143.223.106/63929",ACLName="no_extension_match"
[2020-09-05 17:13:47] NOTICE[1194][C-00000f41] chan_sip.c: Call from '' (45.143.223.106:49698) to extension '011441904911024' rejected because extension not found in context 'public'.
[2020-09-05 17:13:47] SECURITY[1233] res_security_log.c: SecurityEvent="FailedACL",EventTV="2020-09-05T17:13:47.677-0400",Severity="Error",Service="SIP",EventVersion="1",AccountID="011441904911024",SessionID="0x7f2ddc1b7848",LocalAddress="IPV4/UDP/192.168.244.6/5060",RemoteAddress="IPV4/UDP
...
2020-09-06 05:22:48

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