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Port 5505 (checkoutdb)

IANA assigns port 5505 to checkoutdb: Checkout Database.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
checkoutdb TCP Checkout Database Dirk Stoop -
checkoutdb UDP Checkout Database Dirk Stoop -

Registry dates for this port: registered 2007-04.

Check what is listening on port 5505

Linux: is anything listening on TCP 5505?
sudo ss -tlnp 'sport = :5505'
Linux: UDP 5505
sudo ss -ulnp 'sport = :5505'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5505
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5505 '
Windows (Command Prompt)
netstat -ano | findstr :5505
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5505 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5505
From Windows
Test-NetConnection HOST -Port 5505
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5505

Block port 5505 in the firewall

ufw
sudo ufw deny 5505/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5505 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5505 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5505' -Direction Inbound -Protocol TCP -LocalPort 5505 -Action Block
ufw
sudo ufw deny 5505/udp
iptables
sudo iptables -A INPUT -p udp --dport 5505 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5505 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5505' -Direction Inbound -Protocol UDP -LocalPort 5505 -Action Block

Related ports

5503fcp-srvr-inst25504fcp-cics-gw15506amc5507psl-management

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