Snat

This plugin is a really simple and quick plugin that puts the hostname of the server that the page was viewed from. This is useful if you are hosting your blog on many servers and want to see which one the current page came from. It puts the hostname as a HTML comment in the source code where the footer is. Now there isn’t many reasons you may use this for but for the ones that do want to use it, here it is.

Snat's Hostname Detector

This plugin is a really simple and quick plugin that puts the hostname of the server that the page was viewed from. This is useful if you are hosting  …

Andrew Norcross

Liquid Web

mallardduck

Do you run your WordPress in a Cluster based setup? 
Ever need to know what server your request came from? 
Don’t want to have to dig into server access logs to do it?
Look no further, this is just the plugin you’re looking for.
Hello Server adds a menu-node to the Admin Toolbar that tells you what server your request was sent from! In the new Hello Server menu you’ll find the current servers hostname and IP!

Hello Server by Liquid Web

This is a simple plugin that tells you what server your WordPress is running on. It's super useful for when you run WordPress in a clustered, or  …

Snat's Hostname Detector vs Hello Server by Liquid Web