I remember a tile back in early the 2000s when we had a quite nice setup of local dns servers that had internal only zonefiles that resolved names like service.company.local to the internal/dev versions of service.company.com.

Worked quite nicely until the Mac users upgraded to a version of OS X which included Bonjour...

There days Mac OS X does a pretty nice job here all on it's own - this machine I'm typing on here happily answers as Iain.local to the internal network... (For some not-worth-my-time-to-debug reason, our Netgear NAS is a whole lot less reliable with it's Bonjour/zeroconf .local name...)