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Ask HN: map temporary subdomain?

Is there a service which allows me to map a temporary domain to a static IP, heroku-style, i.e. temp123.app.com? I want to host something without registering a name. I guess I'm looking for a bitly with names.
( 2 comments | on HN )
Re:Ask HN: map temporary subdomain? by boldfield on Thursday September 12, 2013 @06:48PM (#6377508)
It's been a long time since I've used the service, but I'm pretty sure you can use no-ip to get what you're looking for done: https://www.noip.com
Re:Ask HN: map temporary subdomain? by kenrose on Thursday September 12, 2013 @06:56PM (#6377537)
There's xip.io, but you will have to hardcode your IP in there. e.g.,

subdomain.myapp.com.12.34.56.78.xip.io