dns-sd(1) on macOS
The text 1d6b9de59b2d, as Mac OS X 10.7.5, Mac OS X 10.7.4, Mac OS X 10.7.3, Mac OS X 10.7.2, Mac OS X 10.7.1, Mac OS X 10.7, Mac OS X 10.6.8, Mac OS X 10.6.7, Mac OS X 10.6.6, Mac OS X 10.6.5 shipped it.
Multicast DNS (mDNS) & DNS Service Discovery (DNS-SD) Test Tool