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Port 5405 (netsupport)

IANA assigns port 5405 to netsupport: NetSupport.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netsupport TCP NetSupport Paul Sanders 2 -
netsupport UDP NetSupport Paul Sanders 2 -

Check what is listening on port 5405

Linux: is anything listening on TCP 5405?
sudo ss -tlnp 'sport = :5405'
Linux: UDP 5405
sudo ss -ulnp 'sport = :5405'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5405
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5405 '
Windows (Command Prompt)
netstat -ano | findstr :5405
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5405 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5405
From Windows
Test-NetConnection HOST -Port 5405
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5405

Block port 5405 in the firewall

ufw
sudo ufw deny 5405/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5405 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5405 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5405' -Direction Inbound -Protocol TCP -LocalPort 5405 -Action Block
ufw
sudo ufw deny 5405/udp
iptables
sudo iptables -A INPUT -p udp --dport 5405 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5405 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5405' -Direction Inbound -Protocol UDP -LocalPort 5405 -Action Block

Related ports

5403hpoms-ci-lstn5404hpoms-dps-lstn5406systemics-sox5407foresyte-clear

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