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Port 3985 (mapper-mapethd)

IANA assigns port 3985 to mapper-mapethd: MAPPER TCP/IP server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mapper-mapethd TCP MAPPER TCP/IP server - -
mapper-mapethd UDP MAPPER TCP/IP server - -

Check what is listening on port 3985

Linux: is anything listening on TCP 3985?
sudo ss -tlnp 'sport = :3985'
Linux: UDP 3985
sudo ss -ulnp 'sport = :3985'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3985
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3985 '
Windows (Command Prompt)
netstat -ano | findstr :3985
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3985 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3985
From Windows
Test-NetConnection HOST -Port 3985
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3985

Block port 3985 in the firewall

ufw
sudo ufw deny 3985/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3985 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3985 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3985' -Direction Inbound -Protocol TCP -LocalPort 3985 -Action Block
ufw
sudo ufw deny 3985/udp
iptables
sudo iptables -A INPUT -p udp --dport 3985 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3985 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3985' -Direction Inbound -Protocol UDP -LocalPort 3985 -Action Block

Related ports

3983eisp3984mapper-nodemgr3986mapper-ws-ethd, mapper-ws_ethd3987centerline

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