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Port 2539 (vsiadmin)

IANA assigns port 2539 to vsiadmin: VSI Admin.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
vsiadmin TCP VSI Admin Rob Juergens -
vsiadmin UDP VSI Admin Rob Juergens -

Check what is listening on port 2539

Linux: is anything listening on TCP 2539?
sudo ss -tlnp 'sport = :2539'
Linux: UDP 2539
sudo ss -ulnp 'sport = :2539'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2539
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2539 '
Windows (Command Prompt)
netstat -ano | findstr :2539
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2539 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2539
From Windows
Test-NetConnection HOST -Port 2539
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2539

Block port 2539 in the firewall

ufw
sudo ufw deny 2539/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2539 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2539 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2539' -Direction Inbound -Protocol TCP -LocalPort 2539 -Action Block
ufw
sudo ufw deny 2539/udp
iptables
sudo iptables -A INPUT -p udp --dport 2539 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2539 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2539' -Direction Inbound -Protocol UDP -LocalPort 2539 -Action Block

Related ports

2537upgrade2538vnwk-prapi2540lonworks2541lonworks2

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