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Port 3990 (bv-is)

IANA assigns port 3990 to bv-is: BindView-IS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
bv-is TCP BindView-IS - -
bv-is UDP BindView-IS - -

Check what is listening on port 3990

Linux: is anything listening on TCP 3990?
sudo ss -tlnp 'sport = :3990'
Linux: UDP 3990
sudo ss -ulnp 'sport = :3990'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3990
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3990 '
Windows (Command Prompt)
netstat -ano | findstr :3990
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3990 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3990
From Windows
Test-NetConnection HOST -Port 3990
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3990

Block port 3990 in the firewall

ufw
sudo ufw deny 3990/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3990 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3990 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3990' -Direction Inbound -Protocol TCP -LocalPort 3990 -Action Block
ufw
sudo ufw deny 3990/udp
iptables
sudo iptables -A INPUT -p udp --dport 3990 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3990 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3990' -Direction Inbound -Protocol UDP -LocalPort 3990 -Action Block

Related ports

3988dcs-config3989bv-queryengine3991bv-smcsrv3992bv-ds

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