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Port 8131 (indigo-vbcp)

IANA assigns port 8131 to indigo-vbcp: INDIGO-VBCP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
indigo-vbcp TCP INDIGO-VBCP Colin Caughie -
indigo-vbcp UDP INDIGO-VBCP Colin Caughie -

Check what is listening on port 8131

Linux: is anything listening on TCP 8131?
sudo ss -tlnp 'sport = :8131'
Linux: UDP 8131
sudo ss -ulnp 'sport = :8131'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8131
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8131 '
Windows (Command Prompt)
netstat -ano | findstr :8131
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8131 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8131
From Windows
Test-NetConnection HOST -Port 8131
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8131

Block port 8131 in the firewall

ufw
sudo ufw deny 8131/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8131 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8131 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8131' -Direction Inbound -Protocol TCP -LocalPort 8131 -Action Block
ufw
sudo ufw deny 8131/udp
iptables
sudo iptables -A INPUT -p udp --dport 8131 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8131 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8131' -Direction Inbound -Protocol UDP -LocalPort 8131 -Action Block

Related ports

8129paycash-wbp8130indigo-vrmi8132dbabble8140Puppet server

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