The host at this IP address is running a malware botnet controller which is being used to control infected computers (bots) around the globe using a trojan horse.
Loki botnet controller located at 104.21.92.21 on port 80 (using HTTP POST):
hXXp://bobbyelectronics.xyz/five/fre.php
$ dig +short bobbyelectronics.xyz
104.21.92.21
Referencing malware binaries (MD5 hash):
03c4801d0dc21f4d6f0ba7df857844f9 — AV detection: 16 / 66 (24.24)
1b4af97e5bb29267e445511854e12b87 — AV detection: 19 / 68 (27.94)
Other malicious domain names hosted on this IP address:
no1geekfun.com 104.21.92.21
bobbyelectronics.xyz 104.21.92.21