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Port 64738 (Mumble)

Default port of the Mumble voice chat server (murmur).

Dynamic / private (ephemeral) port, 49152-65535 TCPUDP Voice, video and chat Meant to face the internet

What port 64738 is used for

Default port of the Mumble voice chat server (murmur).

Security: should port 64738 be open?

Meant to face the internet. Set a server password or certificate-based registration for private servers.

IANA assignment

Port 64738 is in the dynamic range, which IANA never assigns. The usage above is unofficial but widespread.

Check what is listening on port 64738

Linux: is anything listening on TCP 64738?
sudo ss -tlnp 'sport = :64738'
Linux: UDP 64738
sudo ss -ulnp 'sport = :64738'
Linux / macOS: which process owns the port
sudo lsof -nP -i :64738
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':64738 '
Windows (Command Prompt)
netstat -ano | findstr :64738
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 64738 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 64738
From Windows
Test-NetConnection HOST -Port 64738
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 64738

Open port 64738 in the firewall

ufw
sudo ufw allow 64738/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 64738 -j ACCEPT
nftables
sudo nft add rule inet filter input tcp dport 64738 accept
Windows Firewall
New-NetFirewallRule -DisplayName 'Allow TCP 64738' -Direction Inbound -Protocol TCP -LocalPort 64738 -Action Allow
ufw
sudo ufw allow 64738/udp
iptables
sudo iptables -A INPUT -p udp --dport 64738 -j ACCEPT
nftables
sudo nft add rule inet filter input udp dport 64738 accept
Windows Firewall
New-NetFirewallRule -DisplayName 'Allow UDP 64738' -Direction Inbound -Protocol UDP -LocalPort 64738 -Action Allow

Related ports

9987TeamSpeak 3 voice5060SIP49001nusrp, nusdp-disc49150inspider

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.