LanScan

LanScan is a free, simple and efficient IPv4 network scanner that discovers all active devices on any subnet: the local one, or any public subnet that you configure.

Features:
-> Auto-detection of configured interfaces: Airport, Ethernet, Virtual interfaces ...
-> Scan the IP range you like, from 1 IP to the whole IPv4 address space!
-> Scan your local network with ARP packets
-> Scan public IP network ranges with Ping / SMB / mDNS packets
-> Display the IP address, MAC address, hostname (4 max) and vendor associated
-> Discover the SMB domain if any configured
-> Hostname resolution: DNS, mDNS (Apple devices) and SMB (Windows devices)
-> Custom hostname edition
-> Custom comment for each device
-> Export results in CSV files
-> Hide/show each column
-> Align each column as you want
-> No limitation on the number of devices found !

Comparison with the Pro LanScan edition:
-> Only 4 hostnames are fully displayed - You'll see the first 3 chars of the others

Since v4, it's preferred to buy the In-App purchase in LanScan Free edition than buying the LanScan Pro application.