IP Scanner is described as 'for Macintosh scans your local area network to determine the identity of all machines and internet devices on the LAN. Powerful results, yet easy and intuitive to use. Runs on OS X 10.4 and above' and is an app in the Network & Admin category. There are nine alternatives to IP Scanner for a variety of platforms, including Windows, Linux, Mac, BSD and SaaS. The best alternative is Nmap, which is both free and Open Source. Other great apps like IP Scanner are Angry IP Scanner (Free, Open Source), Zenmap (Free, Open Source), Advanced IP Scanner (Free) and Dipiscan (Free).
Angry IP scanner is a very fast IP address and port scanner. It can scan IP addresses in any range as well as any their ports. It is cross-platform and lightweight. Not requiring any installations, it can be freely copied and used anywhere.
Zenmap is the official cross-platform GUI for the Nmap Security Scanner. It is free and runs on Linux, Windows, Mac OS X, etc. Zenmap aims to make Nmap easy for beginners to use while providing advanced features for experienced Nmap users.
Reliable and free network scanner to analyse 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.
Dipiscan is a free IP scanner that allows you to remotely retrieve information about machines on your network using a clear and ergonomic interface (as well as a command-line mode) . It also includes wakeonlan/shutdown and other advanced features.
ZMap is a fast single packet network scanner designed for Internet-wide network surveys. On a typical desktop computer with a gigabit Ethernet connection, ZMap is capable scanning the entire public IPv4 address space in under 45 minutes.
The IPPINGER is an application for checking a host or multiple hosts periodically. It can check IPs, websites and also ports (if are open). It can be configured to notify by email or Windows Notification when a host is down.
Rumble is a network discovery platform that enumerates the network topology, identifies devices, and creates an asset inventory. Rumble runs discovery scans via a locally installed agent or using the standalone Rumble Scanner on the command-line.