How to find docker-machine ip in commandline in Docker beta OS-X?

I can’t seem to be able to resolve docker.local:

vinay@Vinays-MacBook-Pro ~> ping docker.local
ping: cannot resolve docker.local: Unknown host

Diagnose:

vinay@Vinays-MacBook-Pro ~> pinata diagnose -u
OS X: version 10.11.4 (build: 15E65)
Docker.app: version v1.11.0-beta8.2
Running diagnostic tests:
[OK]      docker-cli
[OK]      Moby booted
[OK]      driver.amd64-linux
[OK]      vmnetd
[OK]      osxfs
[OK]      db
[OK]      slirp
[OK]      menubar
[OK]      environment
[OK]      Docker
[OK]      VT-x
Docker logs are being collected into /tmp/20160425-181924.tar.gz
Most specific failure is: No error was detected
Your unique id is: DB968B29-02F7-450B-8B19-62201F32676A
Please quote this in all correspondence.

Any ideas? I removed VirtualBox and all docker-machine stuff from my old toolbox setup. Any cruft that might be left over that may be conflicting with that domain?