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Port 12005 (dbisamserver1)

IANA assigns port 12005 to dbisamserver1: DBISAM Database Server - Regular.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dbisamserver1 TCP DBISAM Database Server - Regular Tim Young -
dbisamserver1 UDP DBISAM Database Server - Regular Tim Young -

Registry dates for this port: registered 2002-05.

Check what is listening on port 12005

Linux: is anything listening on TCP 12005?
sudo ss -tlnp 'sport = :12005'
Linux: UDP 12005
sudo ss -ulnp 'sport = :12005'
Linux / macOS: which process owns the port
sudo lsof -nP -i :12005
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':12005 '
Windows (Command Prompt)
netstat -ano | findstr :12005
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 12005 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 12005
From Windows
Test-NetConnection HOST -Port 12005
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 12005

Block port 12005 in the firewall

ufw
sudo ufw deny 12005/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 12005 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 12005 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 12005' -Direction Inbound -Protocol TCP -LocalPort 12005 -Action Block
ufw
sudo ufw deny 12005/udp
iptables
sudo iptables -A INPUT -p udp --dport 12005 -j DROP
nftables
sudo nft add rule inet filter input udp dport 12005 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 12005' -Direction Inbound -Protocol UDP -LocalPort 12005 -Action Block

Related ports

12003entextmed12004entextlow12006dbisamserver212007accuracer

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