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: None

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:
b
Dig info:
; <<>> DiG 9.10.3-P4-Ubuntu <<>> 104.21.56.37
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 41108
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;104.21.56.37.			IN	A

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

;; Query time: 17 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Fri Feb 18 00:26:02 CST 2022
;; MSG SIZE  rcvd: 105
Host info
Host 37.56.21.104.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 37.56.21.104.in-addr.arpa: NXDOMAIN
Related IP info:
Related comments:
IP Type Details Datetime
217.112.142.148 attackbotsspam
Jun  5 05:54:02 mail.srvfarm.net postfix/smtpd[2919893]: NOQUEUE: reject: RCPT from unknown[217.112.142.148]: 450 4.1.8 : Sender address rejected: Domain not found; from= to= proto=ESMTP helo=
Jun  5 05:54:05 mail.srvfarm.net postfix/smtpd[2917238]: NOQUEUE: reject: RCPT from unknown[217.112.142.148]: 450 4.1.8 : Sender address rejected: Domain not found; from= to= proto=ESMTP helo=
Jun  5 05:54:08 mail.srvfarm.net postfix/smtpd[2917165]: NOQUEUE: reject: RCPT from unknown[217.112.142.148]: 450 4.1.8 : Sender address rejected: Domain not found; from= to= proto=ESMTP helo=
Jun  5 05:57:59 mail.srvfarm.net postfix/smtpd[2919892]: NOQUEUE: reject: RCPT from unknown[217.112.142.148]
2020-06-05 16:38:00
106.13.68.190 attackbotsspam
Jun  5 03:53:21 *** sshd[14347]: User root from 106.13.68.190 not allowed because not listed in AllowUsers
2020-06-05 16:25:16
106.13.165.83 attack
Jun  5 06:22:35 server sshd[4555]: Failed password for root from 106.13.165.83 port 60642 ssh2
Jun  5 06:26:11 server sshd[5026]: Failed password for root from 106.13.165.83 port 52882 ssh2
...
2020-06-05 16:10:13
31.170.51.56 attackbotsspam
(IR/Iran/-) SMTP Bruteforcing attempts
2020-06-05 15:56:48
14.98.22.102 attackbots
SSH authentication failure x 6 reported by Fail2Ban
...
2020-06-05 16:21:41
18.136.238.223 attackspambots
(sshd) Failed SSH login from 18.136.238.223 (SG/Singapore/ec2-18-136-238-223.ap-southeast-1.compute.amazonaws.com): 5 in the last 3600 secs
2020-06-05 16:37:31
185.220.101.20 attack
Unauthorized connection attempt detected from IP address 185.220.101.20 to port 8545
2020-06-05 16:13:25
213.92.194.53 attackspambots
(PL/Poland/-) SMTP Bruteforcing attempts
2020-06-05 16:29:21
223.71.167.163 attackspam
Unauthorized connection attempt detected from IP address 223.71.167.163 to port 3307
2020-06-05 16:12:33
222.186.30.76 attack
Unauthorized connection attempt detected from IP address 222.186.30.76 to port 22
2020-06-05 16:18:40
129.211.99.254 attackspam
Invalid user jean from 129.211.99.254 port 38778
2020-06-05 16:34:11
14.244.36.37 attackbotsspam
20/6/4@23:53:33: FAIL: Alarm-Network address from=14.244.36.37
...
2020-06-05 16:18:07
5.39.64.108 attackspam
(mod_security) mod_security (id:210492) triggered by 5.39.64.108 (FR/France/ns369040.ip-5-39-64.eu): 5 in the last 3600 secs
2020-06-05 16:04:55
49.235.134.46 attackspam
Jun  5 05:50:58 icinga sshd[16425]: Failed password for root from 49.235.134.46 port 46806 ssh2
Jun  5 05:53:02 icinga sshd[19501]: Failed password for root from 49.235.134.46 port 38222 ssh2
...
2020-06-05 16:11:14
37.49.224.163 attackspam
 TCP (SYN) 37.49.224.163:5852 -> port 22, len 48
2020-06-05 16:20:33

Recently Reported IPs

104.21.56.35 26.162.214.131 104.21.56.39 104.21.56.4
104.21.56.42 104.21.56.44 104.21.56.45 104.21.56.47
104.21.56.56 104.21.56.58 104.21.56.59 220.242.230.73
104.21.56.60 104.21.56.61 104.21.56.65 104.21.56.66
228.129.184.146 104.21.56.68 104.21.56.7 104.21.56.71