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Port 2131 (avantageb2b)

IANA assigns port 2131 to avantageb2b: Avantageb2b.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
avantageb2b TCP Avantageb2b Avi Software -
avantageb2b UDP Avantageb2b Avi Software -

Check what is listening on port 2131

Linux: is anything listening on TCP 2131?
sudo ss -tlnp 'sport = :2131'
Linux: UDP 2131
sudo ss -ulnp 'sport = :2131'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2131
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2131 '
Windows (Command Prompt)
netstat -ano | findstr :2131
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2131 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2131
From Windows
Test-NetConnection HOST -Port 2131
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2131

Block port 2131 in the firewall

ufw
sudo ufw deny 2131/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2131 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2131 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2131' -Direction Inbound -Protocol TCP -LocalPort 2131 -Action Block
ufw
sudo ufw deny 2131/udp
iptables
sudo iptables -A INPUT -p udp --dport 2131 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2131 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2131' -Direction Inbound -Protocol UDP -LocalPort 2131 -Action Block

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