HTTPfy

Port 3884 (softrack-meter)

IANA assigns port 3884 to softrack-meter: SofTrack Metering.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
softrack-meter TCP SofTrack Metering John T McCann -
softrack-meter UDP SofTrack Metering John T McCann -

Registry dates for this port: registered 2003-10.

Check what is listening on port 3884

Linux: is anything listening on TCP 3884?
sudo ss -tlnp 'sport = :3884'
Linux: UDP 3884
sudo ss -ulnp 'sport = :3884'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3884
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3884 '
Windows (Command Prompt)
netstat -ano | findstr :3884
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3884 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3884
From Windows
Test-NetConnection HOST -Port 3884
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3884

Block port 3884 in the firewall

ufw
sudo ufw deny 3884/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3884 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3884 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3884' -Direction Inbound -Protocol TCP -LocalPort 3884 -Action Block
ufw
sudo ufw deny 3884/udp
iptables
sudo iptables -A INPUT -p udp --dport 3884 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3884 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3884' -Direction Inbound -Protocol UDP -LocalPort 3884 -Action Block

Related ports

3882msdts13883vrpn3885topflow-ssl3886nei-management

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