Port 5353

Q: What is port 5353?

Automatic local network device discovery (mDNS / Bonjour) UDP port 5353 is used by mDNS (Multicast DNS), the zero-configuration networking protocol that lets devices discover each other on the local network without a centralized DNS server. Well-known implementations include Apple Bonjour (iOS, macOS), Avahi (Linux), and Chromecast device discovery. mDNS uses the multicast address 224.0.0.251 and the .local domain. It should never leak beyond the local network segment.

mDNS

Automatic local network device discovery (mDNS / Bonjour)

Port

5353

Protocol

UDP

Service

mDNS

Security

Restricted

Full name: Multicast DNS (mDNS / Bonjour / Avahi)

What is port 5353?

UDP port 5353 is used by mDNS (Multicast DNS), the zero-configuration networking protocol that lets devices discover each other on the local network without a centralized DNS server. Well-known implementations include Apple Bonjour (iOS, macOS), Avahi (Linux), and Chromecast device discovery. mDNS uses the multicast address 224.0.0.251 and the .local domain. It should never leak beyond the local network segment.

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