So you are using HIDDNS. What has happened is that your old router has one IP address and the new router has a different IP address. Also the new router will need to have the ports forwarded so you will be see your cameras.
First.... Go into your NVR at the local monitor. There should be a mouse and monitor connected to the NVR. Log in. Go to "system configuration" and then "network". Check the box that says "enable DHCP". When you click the "enable DHCP" it will take away all the IP addresses. Those IP address are associated with your old router. Click apply on the bottom of the page. On the left side click to a different page and click back to network to refresh the addresses. There should be a new set of numbers there. Next click on the "NAT" tab on the top of the page. You will need three different number. These numbers are listed under: Server, HTTP, RTSP. These three number are what ports you will need to open on the new router. If you do not open then then the router basically blocks the transmission going in and out. Once this is done then you should be good to go.
Access on your app like normal. In the web browser you will put your domain name.hiddns.com. So in your case it will be "dtran.hiddns.com". If your ports are opened properly then it will take you to the login page of your recorder. If not it will try to redirect and then give you an error message. If you see the error message, the IP address listed there should be your router's external IP address.
Use a website like ping.eu or canyouseeme.org and it will show you your current external IP address. These IP addresses should be matching. Then run a ping on each of the ports numbers for server, http and RTSP and they should say open. If not then you will need to open them again. Keep in mind that TCP and UDP both need to open in the router.
Hope this helps!