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:
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Dig info:
; <<>> DiG 9.10.3-P4-Ubuntu <<>> 104.21.55.91
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 16582
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;104.21.55.91.			IN	A

;; AUTHORITY SECTION:
.			63	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2022021702 1800 900 604800 86400

;; Query time: 78 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Fri Feb 18 10:13:33 CST 2022
;; MSG SIZE  rcvd: 105
Host info
Host 91.55.21.104.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 91.55.21.104.in-addr.arpa: NXDOMAIN
Related IP info:
Related comments:
IP Type Details Datetime
195.231.4.104 attack
Feb  9 13:01:38 plusreed sshd[5094]: Invalid user hrn from 195.231.4.104
...
2020-02-10 02:11:14
1.175.167.146 attackbots
Telnet/23 MH Probe, BF, Hack -
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177.38.243.154 attackbots
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2020-02-10 01:53:23
154.242.223.0 attackspam
Unauthorized connection attempt from IP address 154.242.223.0 on Port 445(SMB)
2020-02-10 01:46:51
87.117.63.39 attackbotsspam
Unauthorized connection attempt from IP address 87.117.63.39 on Port 445(SMB)
2020-02-10 01:58:45
84.39.191.18 attack
Feb  9 14:32:59 debian-2gb-nbg1-2 kernel: \[3514416.360770\] \[UFW BLOCK\] IN=eth0 OUT= MAC=96:00:00:0e:18:f4:d2:74:7f:6e:37:e3:08:00 SRC=84.39.191.18 DST=195.201.40.59 LEN=46 TOS=0x00 PREC=0x00 TTL=241 ID=54321 PROTO=UDP SPT=5605 DPT=1900 LEN=26
2020-02-10 02:20:44
111.230.73.133 attackspam
ssh failed login
2020-02-10 01:43:26
69.167.207.94 attack
Unauthorized connection attempt from IP address 69.167.207.94 on Port 445(SMB)
2020-02-10 02:10:04
24.4.120.241 attackbots
Port probing on unauthorized port 23
2020-02-10 01:59:55
59.115.229.228 attackspambots
Telnet/23 MH Probe, BF, Hack -
2020-02-10 01:59:07
117.70.35.212 attackspambots
Telnet/23 MH Probe, BF, Hack -
2020-02-10 02:06:17
171.246.221.19 attack
Telnet/23 MH Probe, BF, Hack -
2020-02-10 01:45:58
106.13.141.202 attack
Feb  9 18:38:39 cvbnet sshd[20253]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.13.141.202 
Feb  9 18:38:40 cvbnet sshd[20253]: Failed password for invalid user zwd from 106.13.141.202 port 45986 ssh2
...
2020-02-10 02:09:25
112.85.42.176 attack
Feb  9 07:39:29 web1 sshd\[23601\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=112.85.42.176  user=root
Feb  9 07:39:31 web1 sshd\[23601\]: Failed password for root from 112.85.42.176 port 4113 ssh2
Feb  9 07:39:34 web1 sshd\[23601\]: Failed password for root from 112.85.42.176 port 4113 ssh2
Feb  9 07:39:38 web1 sshd\[23601\]: Failed password for root from 112.85.42.176 port 4113 ssh2
Feb  9 07:39:41 web1 sshd\[23601\]: Failed password for root from 112.85.42.176 port 4113 ssh2
2020-02-10 01:43:06
143.202.59.211 attackspambots
Telnet/23 MH Probe, BF, Hack -
2020-02-10 01:53:46

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