while we are waiting for free and open Certificate Authority “Lets Encrypt”, we got a new option.
sslip.io gives a subdomain based upon your ip and you just need to set up SSL key which released at GitHub to your server.
Finally you will have a ip based SSL subdomain address e.g. https://52-0-56-137.sslip.io/
Detail of SSLip.
Amazon Web Services introduced s2n; an Open Source implementation of the TLS protocol. s2n is a library that has been designed to be small, fast, with simplicity as a priority. s2n avoids implementing rarely used options and extensions, and today is just more than 6,000 lines of code. As a result of this, Amazon developers expected that it is easier to review s2n; they have already completed three external security evaluations and penetration tests on s2n, a practice we will be continuing.