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Port 1388 (objective-dbc)

IANA assigns port 1388 to objective-dbc: Objective Solutions DataBase Cache.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
objective-dbc TCP Objective Solutions DataBase Cache Donald Cornwell 2 -
objective-dbc UDP Objective Solutions DataBase Cache Donald Cornwell 2 -

Check what is listening on port 1388

Linux: is anything listening on TCP 1388?
sudo ss -tlnp 'sport = :1388'
Linux: UDP 1388
sudo ss -ulnp 'sport = :1388'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1388
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1388 '
Windows (Command Prompt)
netstat -ano | findstr :1388
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1388 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1388
From Windows
Test-NetConnection HOST -Port 1388
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1388

Block port 1388 in the firewall

ufw
sudo ufw deny 1388/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1388 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1388 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1388' -Direction Inbound -Protocol TCP -LocalPort 1388 -Action Block
ufw
sudo ufw deny 1388/udp
iptables
sudo iptables -A INPUT -p udp --dport 1388 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1388 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1388' -Direction Inbound -Protocol UDP -LocalPort 1388 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.