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 <<>> 104.21.37.21
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 43595
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;104.21.37.21.			IN	A

;; AUTHORITY SECTION:
.			284	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 21:23:26 CST 2022
;; MSG SIZE  rcvd: 105
Host info
Host 21.37.21.104.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 21.37.21.104.in-addr.arpa: NXDOMAIN
Related IP info:
Related comments:
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SSH Brute-Force reported by Fail2Ban
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MultiHost/MultiPort Probe, Scan, Hack -
2019-10-25 21:21:10
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Oct 25 10:24:24 firewall sshd[15470]: error: maximum authentication attempts exceeded for root from 222.186.173.183 port 29648 ssh2 [preauth]
Oct 25 10:24:24 firewall sshd[15470]: Disconnecting: Too many authentication failures [preauth]
...
2019-10-25 21:24:46
14.225.17.9 attackspam
Oct 25 15:45:34 pkdns2 sshd\[10480\]: Address 14.225.17.9 maps to static.vnpt.vn, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!Oct 25 15:45:34 pkdns2 sshd\[10480\]: Invalid user crystalg from 14.225.17.9Oct 25 15:45:37 pkdns2 sshd\[10480\]: Failed password for invalid user crystalg from 14.225.17.9 port 34108 ssh2Oct 25 15:50:36 pkdns2 sshd\[10668\]: Address 14.225.17.9 maps to static.vnpt.vn, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!Oct 25 15:50:36 pkdns2 sshd\[10668\]: Invalid user 1qasdfv1qaz from 14.225.17.9Oct 25 15:50:39 pkdns2 sshd\[10668\]: Failed password for invalid user 1qasdfv1qaz from 14.225.17.9 port 45294 ssh2
...
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