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Port 5743 (watchdoc-pod)

IANA assigns port 5743 to watchdoc-pod: Watchdoc NetPOD Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
watchdoc-pod TCP Watchdoc NetPOD Protocol Christophe Chevalier -
watchdoc-pod UDP Watchdoc NetPOD Protocol Christophe Chevalier -

Registry dates for this port: registered 2005-08.

Check what is listening on port 5743

Linux: is anything listening on TCP 5743?
sudo ss -tlnp 'sport = :5743'
Linux: UDP 5743
sudo ss -ulnp 'sport = :5743'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5743
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5743 '
Windows (Command Prompt)
netstat -ano | findstr :5743
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5743 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5743
From Windows
Test-NetConnection HOST -Port 5743
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5743

Block port 5743 in the firewall

ufw
sudo ufw deny 5743/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5743 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5743 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5743' -Direction Inbound -Protocol TCP -LocalPort 5743 -Action Block
ufw
sudo ufw deny 5743/udp
iptables
sudo iptables -A INPUT -p udp --dport 5743 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5743 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5743' -Direction Inbound -Protocol UDP -LocalPort 5743 -Action Block

Related ports

5741ida-discover15742ida-discover25744watchdoc5745fcopy-server

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