$ host e.ert4.co
e.ert4.co has address 104.21.46.109
e.ert4.co has address 172.67.138.57
e.ert4.co has IPv6 address 2606:4700:3034::ac43:8a39
e.ert4.co has IPv6 address 2606:4700:3032::6815:2e6d
Seen in SMS package delivery fraud spam, tested working (on desktop, leads to blank.org, on mobile, gives the appropriate response)