HTTPfy

Port 3652 (vxcrnbuport)

IANA assigns port 3652 to vxcrnbuport: VxCR NBU Default Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
vxcrnbuport TCP VxCR NBU Default Port Boris Star -
vxcrnbuport UDP VxCR NBU Default Port Boris Star -

Registry dates for this port: registered 2003-01.

Check what is listening on port 3652

Linux: is anything listening on TCP 3652?
sudo ss -tlnp 'sport = :3652'
Linux: UDP 3652
sudo ss -ulnp 'sport = :3652'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3652
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3652 '
Windows (Command Prompt)
netstat -ano | findstr :3652
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3652 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3652
From Windows
Test-NetConnection HOST -Port 3652
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3652

Block port 3652 in the firewall

ufw
sudo ufw deny 3652/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3652 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3652 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3652' -Direction Inbound -Protocol TCP -LocalPort 3652 -Action Block
ufw
sudo ufw deny 3652/udp
iptables
sudo iptables -A INPUT -p udp --dport 3652 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3652 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3652' -Direction Inbound -Protocol UDP -LocalPort 3652 -Action Block

Related ports

3650prismiq-plugin3651xrpc-registry3653tsp3654vaprtm

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