var net.errUnknownPort

4 uses

	net (current package)
		cgo_unix.go#L135: 			return 0, newDNSError(errUnknownPort, network+"/"+service, "")
		cgo_unix.go#L154: 	return 0, newDNSError(errUnknownPort, network+"/"+service, "")
		lookup.go#L109: 		return 0, newDNSError(errUnknownPort, errNetwork+"/"+service, "")
		net.go#L650: 	errUnknownPort = &notFoundError{"unknown port"}