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Port 2531 (ito-e-gui)

IANA assigns port 2531 to ito-e-gui: ITO-E GUI.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ito-e-gui TCP ITO-E GUI Michael Haeuptle -
ito-e-gui UDP ITO-E GUI Michael Haeuptle -

Check what is listening on port 2531

Linux: is anything listening on TCP 2531?
sudo ss -tlnp 'sport = :2531'
Linux: UDP 2531
sudo ss -ulnp 'sport = :2531'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2531
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2531 '
Windows (Command Prompt)
netstat -ano | findstr :2531
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2531 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2531
From Windows
Test-NetConnection HOST -Port 2531
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2531

Block port 2531 in the firewall

ufw
sudo ufw deny 2531/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2531 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2531 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2531' -Direction Inbound -Protocol TCP -LocalPort 2531 -Action Block
ufw
sudo ufw deny 2531/udp
iptables
sudo iptables -A INPUT -p udp --dport 2531 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2531 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2531' -Direction Inbound -Protocol UDP -LocalPort 2531 -Action Block

Related ports

2529utsftp2530vrcommerce2532ovtopmd2533snifferserver

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