HTTPfy

Port 3993 (bv-agent)

IANA assigns port 3993 to bv-agent: BindView-Agent.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
bv-agent TCP BindView-Agent David A Gayler -
bv-agent UDP BindView-Agent David A Gayler -

Registry dates for this port: registered 2005-08.

Check what is listening on port 3993

Linux: is anything listening on TCP 3993?
sudo ss -tlnp 'sport = :3993'
Linux: UDP 3993
sudo ss -ulnp 'sport = :3993'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3993
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3993 '
Windows (Command Prompt)
netstat -ano | findstr :3993
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3993 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3993
From Windows
Test-NetConnection HOST -Port 3993
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3993

Block port 3993 in the firewall

ufw
sudo ufw deny 3993/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3993 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3993 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3993' -Direction Inbound -Protocol TCP -LocalPort 3993 -Action Block
ufw
sudo ufw deny 3993/udp
iptables
sudo iptables -A INPUT -p udp --dport 3993 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3993 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3993' -Direction Inbound -Protocol UDP -LocalPort 3993 -Action Block

Related ports

3991bv-smcsrv3992bv-ds3995iss-mgmt-ssl3996abcsoftware

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