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Port 3984 (mapper-nodemgr)

IANA assigns port 3984 to mapper-nodemgr: MAPPER network node manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mapper-nodemgr TCP MAPPER network node manager - -
mapper-nodemgr UDP MAPPER network node manager - -

Check what is listening on port 3984

Linux: is anything listening on TCP 3984?
sudo ss -tlnp 'sport = :3984'
Linux: UDP 3984
sudo ss -ulnp 'sport = :3984'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3984
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3984 '
Windows (Command Prompt)
netstat -ano | findstr :3984
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3984 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3984
From Windows
Test-NetConnection HOST -Port 3984
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3984

Block port 3984 in the firewall

ufw
sudo ufw deny 3984/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3984 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3984 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3984' -Direction Inbound -Protocol TCP -LocalPort 3984 -Action Block
ufw
sudo ufw deny 3984/udp
iptables
sudo iptables -A INPUT -p udp --dport 3984 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3984 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3984' -Direction Inbound -Protocol UDP -LocalPort 3984 -Action Block

Related ports

3982eis3983eisp3985mapper-mapethd3986mapper-ws-ethd, mapper-ws_ethd

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