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Port 4055 (ccu-comm-3)

IANA assigns port 4055 to ccu-comm-3: CosmoCall Universe Communications Port 3.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ccu-comm-3 TCP CosmoCall Universe Communications Port 3 Steve Dellutri 2 -
ccu-comm-3 UDP CosmoCall Universe Communications Port 3 Steve Dellutri 2 -

Registry dates for this port: registered 2006-07.

Check what is listening on port 4055

Linux: is anything listening on TCP 4055?
sudo ss -tlnp 'sport = :4055'
Linux: UDP 4055
sudo ss -ulnp 'sport = :4055'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4055
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4055 '
Windows (Command Prompt)
netstat -ano | findstr :4055
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4055 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4055
From Windows
Test-NetConnection HOST -Port 4055
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4055

Block port 4055 in the firewall

ufw
sudo ufw deny 4055/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4055 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4055 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4055' -Direction Inbound -Protocol TCP -LocalPort 4055 -Action Block
ufw
sudo ufw deny 4055/udp
iptables
sudo iptables -A INPUT -p udp --dport 4055 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4055 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4055' -Direction Inbound -Protocol UDP -LocalPort 4055 -Action Block

Related ports

4053ccu-comm-14054ccu-comm-24056lms4057wfm

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