Is port 5353 (mDNS (Multicast DNS)) dangerous?

Port 5353 is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose with standard security practices.

Should port 5353 be open on my firewall?

Port 5353 is generally safe to have open. Apply standard security practices: keep software updated and monitor access logs.

What transport protocol does port 5353 use?

Port 5353 (mDNS (Multicast DNS)) uses the UDP transport protocol and falls under the DNS category.

:5353 (UDP)

mDNS (Multicast DNS)

Low Risiko

UDP — DNS

On this page

Ikhtisar Port

Nomor Port 5353

Nama Layanan mDNS (Multicast DNS)

Protokol Transport UDP

Kategori DNS

Risiko Keamanan Low

Rentang Port Terdaftar (1024-49151)

Apa itu Port 5353?

Port 5353 is used by mDNS (Multicast DNS), which enables zero-configuration DNS name resolution on local networks without a central DNS server. Apple's Bonjour and Linux's Avahi implement mDNS to allow devices to discover services like printers, AirPlay, and Chromecast. Queries and responses are sent to the multicast address 224.0.0.251.

UDP DNS Umum Digunakan

Pertimbangan Keamanan

Port 5353 (mDNS (Multicast DNS)) diklasifikasikan sebagai risiko rendah. Layanan ini menggunakan enkripsi atau memiliki permukaan serangan yang minimal, sehingga relatif aman untuk diekspos.

Rekomendasi: Terapkan praktik keamanan standar. Jaga perangkat lunak tetap diperbarui dan pantau akses.

mDNS (Multicast DNS)

Ikhtisar Port

Apa itu Port 5353?

Pertimbangan Keamanan

Port Terkait — DNS

Istilah Terkait