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 <<>> 104.21.81.100
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 29832
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;104.21.81.100.			IN	A

;; AUTHORITY SECTION:
.			600	IN	SOA	a.root-servers.net. nstld.verisign-grs.com. 2022021701 1800 900 604800 86400

;; Query time: 44 msec
;; SERVER: 183.60.83.19#53(183.60.83.19)
;; WHEN: Fri Feb 18 03:01:53 CST 2022
;; MSG SIZE  rcvd: 106
Host info
Host 100.81.21.104.in-addr.arpa. not found: 3(NXDOMAIN)
Nslookup info:
Server:		183.60.83.19
Address:	183.60.83.19#53

** server can't find 100.81.21.104.in-addr.arpa: NXDOMAIN
Related IP info:
Related comments:
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Autoban   191.53.249.50 AUTH/CONNECT
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Autoban   191.53.223.60 AUTH/CONNECT
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Autoban   191.53.197.48 AUTH/CONNECT
2019-07-22 04:21:34
191.53.223.100 attackspam
Autoban   191.53.223.100 AUTH/CONNECT
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Sun, 21 Jul 2019 18:28:52 +0000 likely compromised host or open proxy. ddos rate spidering
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1.53.183.160 attackbots
Sun, 21 Jul 2019 18:28:42 +0000 likely compromised host or open proxy. ddos rate spidering
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Sun, 21 Jul 2019 18:28:44 +0000 likely compromised host or open proxy. ddos rate spidering
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191.53.223.175 attackspambots
Autoban   191.53.223.175 AUTH/CONNECT
2019-07-22 04:04:55
191.53.253.184 attack
Autoban   191.53.253.184 AUTH/CONNECT
2019-07-22 03:45:27
191.53.249.185 attack
Brute force attempt
2019-07-22 03:55:42

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