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Port 5742 (ida-discover2)

IANA assigns port 5742 to ida-discover2: IDA Discover Port 2.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ida-discover2 TCP IDA Discover Port 2 MPITech Support -
ida-discover2 UDP IDA Discover Port 2 MPITech Support -

Check what is listening on port 5742

Linux: is anything listening on TCP 5742?
sudo ss -tlnp 'sport = :5742'
Linux: UDP 5742
sudo ss -ulnp 'sport = :5742'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5742
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5742 '
Windows (Command Prompt)
netstat -ano | findstr :5742
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5742 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5742
From Windows
Test-NetConnection HOST -Port 5742
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5742

Block port 5742 in the firewall

ufw
sudo ufw deny 5742/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5742 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5742 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5742' -Direction Inbound -Protocol TCP -LocalPort 5742 -Action Block
ufw
sudo ufw deny 5742/udp
iptables
sudo iptables -A INPUT -p udp --dport 5742 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5742 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5742' -Direction Inbound -Protocol UDP -LocalPort 5742 -Action Block

Related ports

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