How far can mobs see?

I know if I have my render distance set to far then I can see mobs before they see me. Does anyone know precisely how far a mob can see?

This would be really nice to know since I could simply make sure there is water around my island that goes further than mobs can see.

Here is the relevant piece of code from the Minecraft source:

EntityPlayer entityplayer = worldObj.getClosestPlayerToEntity(this, 16D);
        if(entityplayer != null && canEntityBeSeen(entityplayer))

This means that the range of sight is 16 blocks; however, there's also something funny. For one, if there is a closer player than you, but they can't be seen (for example, if the closer player is behind a wall), then the mob won't notice you.

Additionally, the ghast uses a separate method including:

worldObj.getClosestPlayerToEntity(this, 100D);

So it will see you 100 blocks away.

This isn't the best evidence I've ever dragged from the interwebs, but here is what my searching on the minecraft forums has found.

Mobs seem to have an awareness extending 16 blocks.

I never did find this factoid spelled out specifically but I did find these posts referencing it:

"The only change to line of sight is increasing from 16 to 32?"
- http://www.minecraftforum.net/viewtopic.php?f=25&t=96258#p1481390
"Standard 16 block awareness range"
- http://www.minecraftforum.net/viewtopic.php?f=25&t=86872
16 blocks is referenced as aggro radius
- http://www.minecraftforum.net/viewtopic.php?f=35&t=76554

From the numerous threads I've been reading (and my own experience) the mobs also don't rely on sight. So if you are digging in a tunnel next to a hostile cave the mob knows you are there.

All have 16 blocks line of sight, except the Enderman, which has 64 blocks, and Ghasts, this time 100.

How far can mobs see?

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