Port 3986 (mapper-ws-ethd, mapper-ws_ethd)

IANA assigns port 3986 to mapper-ws-ethd, mapper-ws_ethd: MAPPER workstation server IANA assigned this well-formed service name as a replacement for "mapper-ws_ethd"..

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

mapper-ws-ethd TCP MAPPER workstation server IANA assigned this well-formed service name as a replacement for "mapper-ws_ethd". John C Horton -

mapper-ws_ethd TCP MAPPER workstation server
This entry is an alias to "mapper-ws-ethd". This entry is now historic, not usable for use with many common service discovery mechanisms. John C Horton -

mapper-ws-ethd UDP MAPPER workstation server IANA assigned this well-formed service name as a replacement for "mapper-ws_ethd". John C Horton -

mapper-ws_ethd UDP MAPPER workstation server
This entry is an alias to "mapper-ws-ethd". This entry is now historic, not usable for use with many common service discovery mechanisms. John C Horton -

Check what is listening on port 3986

Linux: is anything listening on TCP 3986?

sudo ss -tlnp 'sport = :3986'

Linux: UDP 3986

sudo ss -ulnp 'sport = :3986'

Linux / macOS: which process owns the port

sudo lsof -nP -i :3986

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':3986 '

Windows (Command Prompt)

netstat -ano | findstr :3986

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3986 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine

nc -vz -w 5 HOST 3986

From Windows

Test-NetConnection HOST -Port 3986

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 3986

Block port 3986 in the firewall

ufw

sudo ufw deny 3986/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 3986 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 3986 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 3986' -Direction Inbound -Protocol TCP -LocalPort 3986 -Action Block

ufw

sudo ufw deny 3986/udp