HTTPfy

Port 3654 (vaprtm)

IANA assigns port 3654 to vaprtm: VAP RealTime Messenger.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
vaprtm TCP VAP RealTime Messenger Boris Polevoy -
vaprtm UDP VAP RealTime Messenger Boris Polevoy -

Registry dates for this port: registered 2003-01.

Check what is listening on port 3654

Linux: is anything listening on TCP 3654?
sudo ss -tlnp 'sport = :3654'
Linux: UDP 3654
sudo ss -ulnp 'sport = :3654'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3654
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3654 '
Windows (Command Prompt)
netstat -ano | findstr :3654
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3654 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3654
From Windows
Test-NetConnection HOST -Port 3654
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3654

Block port 3654 in the firewall

ufw
sudo ufw deny 3654/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3654 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3654 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3654' -Direction Inbound -Protocol TCP -LocalPort 3654 -Action Block
ufw
sudo ufw deny 3654/udp
iptables
sudo iptables -A INPUT -p udp --dport 3654 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3654 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3654' -Direction Inbound -Protocol UDP -LocalPort 3654 -Action Block

Related ports

3652vxcrnbuport3653tsp3655abatemgr3656abatjss

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