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 <<>> 21.166.99.51
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 17097
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;21.166.99.51.			IN	A

;; AUTHORITY SECTION:
.			30	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2025071201 1800 900 604800 86400

;; Query time: 14 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Sun Jul 13 11:08:20 CST 2025
;; MSG SIZE  rcvd: 105
Host info
Host 51.99.166.21.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 51.99.166.21.in-addr.arpa: NXDOMAIN
Related IP info:
Related comments:
IP Type Details Datetime
81.183.253.86 attackspam
2019-08-23T18:06:58.795922abusebot-6.cloudsearch.cf sshd\[1484\]: Invalid user edineide from 81.183.253.86 port 32325
2019-08-24 02:37:28
92.245.106.242 attackbotsspam
2019-08-23 H=\(92-245-106-242.mega.kg\) \[92.245.106.242\] F=\ rejected RCPT \: Mail not accepted. 92.245.106.242 is listed at a DNSBL.
2019-08-23 H=\(92-245-106-242.mega.kg\) \[92.245.106.242\] F=\ rejected RCPT \: Mail not accepted. 92.245.106.242 is listed at a DNSBL.
2019-08-23 H=\(92-245-106-242.mega.kg\) \[92.245.106.242\] F=\ rejected RCPT \<**REMOVED**@**REMOVED**.de\>: Mail not accepted. 92.245.106.242 is listed at a DNSBL.
2019-08-24 02:50:34
150.254.222.97 attackspam
Automatic report - Banned IP Access
2019-08-24 02:41:00
121.128.135.73 attackspambots
(mod_security) mod_security (id:230011) triggered by 121.128.135.73 (KR/South Korea/-): 5 in the last 3600 secs
2019-08-24 03:11:51
167.71.217.110 attackbots
Aug 23 08:48:29 friendsofhawaii sshd\[9036\]: Invalid user customer from 167.71.217.110
Aug 23 08:48:29 friendsofhawaii sshd\[9036\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=167.71.217.110
Aug 23 08:48:32 friendsofhawaii sshd\[9036\]: Failed password for invalid user customer from 167.71.217.110 port 45322 ssh2
Aug 23 08:53:13 friendsofhawaii sshd\[9440\]: Invalid user jeni from 167.71.217.110
Aug 23 08:53:13 friendsofhawaii sshd\[9440\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=167.71.217.110
2019-08-24 02:56:58
192.228.100.29 attackspam
brute force login attack on cpanel
2019-08-24 03:01:52
61.69.78.78 attackspam
Aug 23 19:42:22 ns41 sshd[23987]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=61.69.78.78
2019-08-24 02:39:19
111.67.207.51 attackspambots
Aug 23 08:29:30 web1 sshd\[6053\]: Invalid user sbin from 111.67.207.51
Aug 23 08:29:30 web1 sshd\[6053\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=111.67.207.51
Aug 23 08:29:32 web1 sshd\[6053\]: Failed password for invalid user sbin from 111.67.207.51 port 42734 ssh2
Aug 23 08:31:40 web1 sshd\[6262\]: Invalid user bmike from 111.67.207.51
Aug 23 08:31:40 web1 sshd\[6262\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=111.67.207.51
2019-08-24 03:00:45
116.196.83.179 attack
Aug 23 20:27:43 ubuntu-2gb-nbg1-dc3-1 sshd[21422]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=116.196.83.179
Aug 23 20:27:46 ubuntu-2gb-nbg1-dc3-1 sshd[21422]: Failed password for invalid user yseo from 116.196.83.179 port 56960 ssh2
...
2019-08-24 02:47:06
218.255.150.226 attack
Aug 23 20:43:53 vps sshd\[3675\]: Invalid user mqm from 218.255.150.226
Aug 23 20:45:49 vps sshd\[3682\]: Invalid user kevin from 218.255.150.226
...
2019-08-24 03:05:03
124.149.253.83 attack
Aug 23 14:24:44 plusreed sshd[17281]: Invalid user julia from 124.149.253.83
...
2019-08-24 02:35:43
193.169.252.74 attack
445/tcp 445/tcp 445/tcp...
[2019-06-26/08-23]14pkt,1pt.(tcp)
2019-08-24 03:12:53
103.76.87.30 attackbotsspam
Aug 23 20:20:24 MainVPS sshd[3289]: Invalid user www from 103.76.87.30 port 48456
Aug 23 20:20:24 MainVPS sshd[3289]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=103.76.87.30
Aug 23 20:20:24 MainVPS sshd[3289]: Invalid user www from 103.76.87.30 port 48456
Aug 23 20:20:26 MainVPS sshd[3289]: Failed password for invalid user www from 103.76.87.30 port 48456 ssh2
Aug 23 20:28:53 MainVPS sshd[3875]: Invalid user test1 from 103.76.87.30 port 41992
...
2019-08-24 02:36:08
132.232.43.115 attackspam
Aug 23 16:20:46 localhost sshd\[19453\]: Invalid user spark from 132.232.43.115 port 56776
Aug 23 16:20:46 localhost sshd\[19453\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=132.232.43.115
Aug 23 16:20:48 localhost sshd\[19453\]: Failed password for invalid user spark from 132.232.43.115 port 56776 ssh2
...
2019-08-24 02:52:12
181.48.36.60 attackbots
445/tcp 445/tcp 445/tcp...
[2019-06-25/08-23]13pkt,1pt.(tcp)
2019-08-24 02:56:41

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