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Port 3925 (zmp)

IANA assigns port 3925 to zmp: Zoran Media Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
zmp TCP Zoran Media Port Gerard Cerchio -
zmp UDP Zoran Media Port Gerard Cerchio -

Registry dates for this port: registered 2003-11.

Check what is listening on port 3925

Linux: is anything listening on TCP 3925?
sudo ss -tlnp 'sport = :3925'
Linux: UDP 3925
sudo ss -ulnp 'sport = :3925'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3925
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3925 '
Windows (Command Prompt)
netstat -ano | findstr :3925
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3925 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3925
From Windows
Test-NetConnection HOST -Port 3925
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3925

Block port 3925 in the firewall

ufw
sudo ufw deny 3925/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3925 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3925 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3925' -Direction Inbound -Protocol TCP -LocalPort 3925 -Action Block
ufw
sudo ufw deny 3925/udp
iptables
sudo iptables -A INPUT -p udp --dport 3925 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3925 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3925' -Direction Inbound -Protocol UDP -LocalPort 3925 -Action Block

Related ports

3923symb-sb-port3924mpl-gprs-port3926winport3927natdataservice

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