Angry IP Scanner (ipscan) is a free and open-source network scanner available for macOS (and other operating systems). It[SQ]s a lightweight utility that allows you to quickly scan a range of IP addresses to discover active hosts and gather information about them. This information can include :

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Hostnames:

The hostnames associated with IP addresses.
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MAC addresses:

The physical addresses of network interface cards.
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Open ports:

Which ports are open on each discovered host, indicating running services.
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NetBIOS names:

Names used by Windows networks.
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Operating system detection (fingerprinting):

Attempts to identify the operating system running on the host.

What it[SQ]s used for:

Angry IP Scanner is a useful tool for various network administration and security tasks, such as:

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Network mapping:

Identifying all devices on a network.
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Security auditing:

Identifying open ports that could be vulnerabilities.
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Troubleshooting:

Finding problematic devices or network configurations.
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Inventory management:

Keeping track of network devices.

Key features:

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Speed:

It[SQ]s designed to be fast, scanning networks quickly.
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Simplicity:

Its interface is straightforward and easy to use.
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Extensibility:

It supports plugins to add functionality.
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Lightweight:

It has a small footprint and doesn[SQ]t require extensive system resources.
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Open Source:

The source code is publicly available, allowing for community contributions and modifications.

However, it[SQ]s important to note that using Angry IP Scanner (or any network scanner) without permission on a network you don[SQ]t own or manage is unethical and potentially illegal. Always obtain appropriate authorization before scanning any network.