Description:
Asynchronous DNS library
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Type: Formula
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Latest Version: 1.34.6@0
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Tracked Since: Dec 17, 2025
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Links:
Homepage |
formulae.brew.sh
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Category: Networking
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Tags:
dns
networking
async
c-library
resolver
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Install:
brew install c-ares
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About:
c-ares is a C library that performs asynchronous DNS requests and name resolves. It enables applications to handle DNS lookups without blocking, improving performance and reliability in networked software. The library is widely used for its stability and compliance with internet standards.
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Key Features:
- Asynchronous, non-blocking DNS resolution
- Support for A/AAAA, SRV, MX, TXT, and CNAME records
- Cross-platform (Unix, Windows, embedded)
- No external dependencies beyond a C standard library
- Thread-safe API
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Use Cases:
- Embedded systems and IoT devices requiring lightweight DNS
- High-performance servers needing concurrent DNS lookups
- Applications that must avoid blocking on network I/O
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Alternatives:
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getaddrinfo
– Standard OS API; typically blocking and less flexible for async patterns.
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unbound
– Full DNS resolver with DNSSEC; heavier and more complex than c-ares.
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libresolv
– Legacy resolver library; limited async capabilities and portability.
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License: MIT
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Bottles available for: arm64_tahoe, arm64_sequoia, arm64_sonoma, sonoma, arm64_linux, x86_64_linux
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