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Port 2903 (suitcase)

IANA assigns port 2903 to suitcase: SUITCASE.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
suitcase TCP SUITCASE Milton E Sagen -
suitcase UDP SUITCASE Milton E Sagen -

Check what is listening on port 2903

Linux: is anything listening on TCP 2903?
sudo ss -tlnp 'sport = :2903'
Linux: UDP 2903
sudo ss -ulnp 'sport = :2903'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2903
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2903 '
Windows (Command Prompt)
netstat -ano | findstr :2903
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2903 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2903
From Windows
Test-NetConnection HOST -Port 2903
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2903

Block port 2903 in the firewall

ufw
sudo ufw deny 2903/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2903 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2903 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2903' -Direction Inbound -Protocol TCP -LocalPort 2903 -Action Block
ufw
sudo ufw deny 2903/udp
iptables
sudo iptables -A INPUT -p udp --dport 2903 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2903 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2903' -Direction Inbound -Protocol UDP -LocalPort 2903 -Action Block

Related ports

2901allstorcns2902netaspi2904m2ua2905m3ua, De-registered

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