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Port 3937 (dvbservdsc)

IANA assigns port 3937 to dvbservdsc: DVB Service Discovery.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dvbservdsc TCP DVB Service Discovery Bert van Willigen, Peter MacAvock -
dvbservdsc UDP DVB Service Discovery Bert van Willigen, Peter MacAvock -

Registry dates for this port: registered 2003-11.

Check what is listening on port 3937

Linux: is anything listening on TCP 3937?
sudo ss -tlnp 'sport = :3937'
Linux: UDP 3937
sudo ss -ulnp 'sport = :3937'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3937
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3937 '
Windows (Command Prompt)
netstat -ano | findstr :3937
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3937 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3937
From Windows
Test-NetConnection HOST -Port 3937
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3937

Block port 3937 in the firewall

ufw
sudo ufw deny 3937/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3937 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3937 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3937' -Direction Inbound -Protocol TCP -LocalPort 3937 -Action Block
ufw
sudo ufw deny 3937/udp
iptables
sudo iptables -A INPUT -p udp --dport 3937 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3937 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3937' -Direction Inbound -Protocol UDP -LocalPort 3937 -Action Block

Related ports

3935sdp-portmapper3936mailprox3938dbcontrol-agent, dbcontrol_agent3939aamp

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