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Port 1939 (jvserver)

IANA assigns port 1939 to jvserver: JetVision Server Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
jvserver TCP JetVision Server Port - -
jvserver UDP JetVision Server Port - -

Check what is listening on port 1939

Linux: is anything listening on TCP 1939?
sudo ss -tlnp 'sport = :1939'
Linux: UDP 1939
sudo ss -ulnp 'sport = :1939'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1939
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1939 '
Windows (Command Prompt)
netstat -ano | findstr :1939
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1939 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1939
From Windows
Test-NetConnection HOST -Port 1939
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1939

Block port 1939 in the firewall

ufw
sudo ufw deny 1939/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1939 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1939 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1939' -Direction Inbound -Protocol TCP -LocalPort 1939 -Action Block
ufw
sudo ufw deny 1939/udp
iptables
sudo iptables -A INPUT -p udp --dport 1939 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1939 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1939' -Direction Inbound -Protocol UDP -LocalPort 1939 -Action Block

Related ports

1937jwserver1938jwclient1940jvclient1941dic-aida

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