hi i tough i could share this great database where you can search for ptr with in a certain sites domain, for example these are some results of asus.com
203.156.245.226 event.asus.com.cn
203.156.245.223 support.asus.com.cn
203.156.245.225 member.asus.com.cn
207.106.93.232 asus.net.client.newsread.com
207.18.22.87 andy-asus.pdt.com
207.106.92.232 asus.net.client.newsread.com
208.60.44.242 asus.iciapps.com
210.242.47.2 proxy.asus.com.tw
210.242.47.13 tsdwww.asus.com.tw
this is where you can search
https://www.deepmagic.com/
Bookmarks