-H "Host:x.y.z" http://MyIP/ is not using the provided IP and is going through the DNS

[oah4333]

Hi
I am using Siege 4.0.5 on centos 7. when I issue:
siege --delay=0 -p -t2S -c1 -H "Host:x.y.z" http://Server's-IP/
The request is still going through the DNS and hence cloudflare. The whole reason I am using the server's IP and the host-header is to circumvent cloudflare i.e., the siege --delay=0 -p -t2S -c1 -H "Host:x.y.z" http://Server's-IP/ is behaving as if I have typed:
siege --delay=0 -p -t2S -c1 http://x.y.z/

I tried the same header with apachebench and it is working just fine (it is hitting the server via the specified IP address) and then branches tot he host (as expected).