This is a good portable app to scan your home network (and work network) to determine what devices are on the network; and, can also be used to detect intrusions or devices that should not be on your network.
Advanced IP Scanner
Reliable and free network scanner to analyze LAN. The program shows all network devices, gives you access to shared folders, provides remote control of computers (via RDP and Radmin), and can even remotely switch computers off. It is easy to use and runs as a portable edition. It should be the first choice for every network admin.
- Easy access to network shares
- Remote control via RDP and Radmin
- MAC addresses detection
- Switching on/off computers remotely
- Export scan results to CSV
- No installation required
SOURCE: Advanced IP Scanner