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 <<>> 104.21.57.31
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 14940
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;104.21.57.31.			IN	A

;; AUTHORITY SECTION:
.			599	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2022021801 1800 900 604800 86400

;; Query time: 16 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Sat Feb 19 03:30:31 CST 2022
;; MSG SIZE  rcvd: 105
Host info
Host 31.57.21.104.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 31.57.21.104.in-addr.arpa: NXDOMAIN
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Jul 29 08:12:52 shared05 sshd[6145]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=79.137.4.24  user=r.r
Jul 29 08:12:53 shared05 sshd[6145]: Failed password for r.r from 79.137.4.24 port 41770 ssh2
Jul 29 08:12:53 shared05 sshd[6145]: Received disconnect from 79.137.4.24 port 41770:11: Bye Bye [preauth]
Jul 29 08:12:53 shared05 sshd[6145]: Disconnected from 79.137.4.24 port 41770 [preauth]
Jul 29 08:22:09 shared05 sshd[9046]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=79.137.4.24  user=r.r
Jul 29 08:22:11 shared05 sshd[9046]: Failed password for r.r from 79.137.4.24 port 50730 ssh2
Jul 29 08:22:11 shared05 sshd[9046]: Received disconnect from 79.137.4.24 port 50730:11: Bye Bye [preauth]
Jul 29 08:22:11 shared05 sshd[9046]: Disconnected from 79.137.4.24 port 50730 [preauth]


........
-----------------------------------------------
https://www.blocklist.de/en/view.html?ip=79.137.4.24
2019-07-29 19:03:20
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[ ?? ] From bounce@ds.advicemebrazil.com Sun Jul 28 23:46:42 2019
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