apt-cache policy
Package files:
100 /var/lib/dpkg/status
release a=now
500 http://security.debian.org/ stable/updates/main Translation-en
500 http://security.debian.org/ stable/updates/main amd64 Packages
release v=7.0,o=Debian,a=stable,n=wheezy,l=Debian-Security,c=main
origin security.debian.org
500 http://ftp.us.debian.org/debian/ unstable/main Translation-en
500 http://ftp.us.debian.org/debian/ unstable/main amd64 Packages
release o=Debian,a=unstable,n=sid,l=Debian,c=main
origin ftp.us.debian.org