The short answer is it depends. By default QuotaGuard Static allows you to route outbound traffic from your app via a Static IP, for example to access a database behind a firewall.
If you want to route inbound traffic via a static IP to your application then you need to do a bit more configuration and it comes with some caveats.
#1 - Creating a DNS record to point to a Heroku application
If you are doing this to try and setup DNS rules for your Heroku app (for example pointing myapp.com to your Heroku app) you should do this via a CNAME, not via an A record on the IP address. Heroku have more details on their documentation pages. QuotaGuard Static is not required for this.
#2 - Clients of your website have strict internal firewall controls and can only access websites with a specific IP address
If you have clients that can only access specific sites on the internet and you need a static IP address that they can add to their firewall then you can use QuotaGuard Static. Simply follow the instructions here to get started: http://support.quotaguard.com/solution/articles/5000633969
Currently there are several key limitations with this service:
1. You cannot accept HTTPS traffic unless you provide us with your SSL key and certificate. You will also need to set up your own DNS A Record pointing to the Static IP address so that your SSL certificate is being used on a valid domain.
2. You cannot just enter in the Static IP address. Multiple accounts may be sharing the same IP address so without using a hostname in your URL we are unable to determine which account to route traffic to