Official Minecraft Wiki Entry
Type Solid Block
Physics No
Transparency No
Luminance No
Blast Resistance 18,000,000
Tool Grid None
Renewable No
Stackable Bedrock64
Flammable No
Appears in Minecraft
First Appearance Classic 0.0.12a
Name bedrock
Block Data Information
Decimal Data Value 07
Hexadecimal Data Value 7
Binary Data Value 0111

Bedrock is both an indestructible and unmineable block. The primary function of bedrock is to create an impassable barrier at the bottom of the Overworld and at the top and bottom of the Nether. It can also be used by server administrators to create an inescapable "Jail", for disruptive or otherwise uncooperative players.

Bedrock spawns in the bottom five layers of the Overworld, in random heights, and the top and bottom four layers of the Nether.