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 <<>> 104.21.21.37
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 54937
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;104.21.21.37.			IN	A

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

;; Query time: 24 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Thu Feb 17 18:57:05 CST 2022
;; MSG SIZE  rcvd: 105
Host info
Host 37.21.21.104.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 37.21.21.104.in-addr.arpa: NXDOMAIN
Related IP info:
Related comments:
IP Type Details Datetime
5.35.9.56 attackspambots
445/tcp
[2019-07-20]1pkt
2019-07-20 21:31:27
185.176.27.42 attackbotsspam
Honeypot attack, port: 1, PTR: PTR record not found
2019-07-20 22:13:57
194.61.26.4 attack
2019-07-20T12:05:59.962836abusebot-8.cloudsearch.cf sshd\[23668\]: Invalid user mysql from 194.61.26.4 port 23642
2019-07-20 21:23:44
14.244.117.213 attackspambots
445/tcp
[2019-07-20]1pkt
2019-07-20 21:24:45
201.123.186.53 attack
445/tcp
[2019-07-20]1pkt
2019-07-20 21:24:10
193.112.223.243 attack
Auto reported by IDS
2019-07-20 21:33:43
185.20.179.61 attack
Invalid user eliza from 185.20.179.61 port 43196
2019-07-20 21:16:55
190.119.190.122 attackspam
SSH authentication failure x 6 reported by Fail2Ban
...
2019-07-20 21:56:46
222.186.15.110 attack
SSH Brute Force, server-1 sshd[22832]: Failed password for root from 222.186.15.110 port 41950 ssh2
2019-07-20 22:06:55
118.98.121.195 attackspambots
2019-07-20T13:32:39.901973abusebot-5.cloudsearch.cf sshd\[16673\]: Invalid user ashok from 118.98.121.195 port 52920
2019-07-20 21:34:13
179.25.46.207 attackspam
23/tcp
[2019-07-20]1pkt
2019-07-20 21:38:57
105.187.153.56 attackspam
LGS,WP GET /wp-login.php
2019-07-20 21:27:41
79.133.132.20 attackbotsspam
445/tcp
[2019-07-20]1pkt
2019-07-20 21:59:59
203.121.116.11 attackbots
Jul 20 14:09:53 mail sshd\[30982\]: Failed password for invalid user tester from 203.121.116.11 port 39757 ssh2
Jul 20 14:27:29 mail sshd\[31214\]: Invalid user Redistoor from 203.121.116.11 port 37603
...
2019-07-20 21:32:04
203.90.251.154 attack
Autoban   203.90.251.154 AUTH/CONNECT
2019-07-20 22:16:36

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