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Port 3924 (mpl-gprs-port)

IANA assigns port 3924 to mpl-gprs-port: MPL_GPRS_PORT.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mpl-gprs-port TCP MPL_GPRS_PORT David Barrass 2 -
mpl-gprs-port UDP MPL_GPRS_Port David Barrass 2 -

Registry dates for this port: registered 2003-11.

Check what is listening on port 3924

Linux: is anything listening on TCP 3924?
sudo ss -tlnp 'sport = :3924'
Linux: UDP 3924
sudo ss -ulnp 'sport = :3924'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3924
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3924 '
Windows (Command Prompt)
netstat -ano | findstr :3924
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3924 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3924
From Windows
Test-NetConnection HOST -Port 3924
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3924

Block port 3924 in the firewall

ufw
sudo ufw deny 3924/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3924 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3924 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3924' -Direction Inbound -Protocol TCP -LocalPort 3924 -Action Block
ufw
sudo ufw deny 3924/udp
iptables
sudo iptables -A INPUT -p udp --dport 3924 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3924 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3924' -Direction Inbound -Protocol UDP -LocalPort 3924 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.