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Port 4053 (ccu-comm-1)

IANA assigns port 4053 to ccu-comm-1: CosmoCall Universe Communications Port 1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ccu-comm-1 TCP CosmoCall Universe Communications Port 1 - -
ccu-comm-1 UDP CosmoCall Universe Communications Port 1 - -

Check what is listening on port 4053

Linux: is anything listening on TCP 4053?
sudo ss -tlnp 'sport = :4053'
Linux: UDP 4053
sudo ss -ulnp 'sport = :4053'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4053
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4053 '
Windows (Command Prompt)
netstat -ano | findstr :4053
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4053 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4053
From Windows
Test-NetConnection HOST -Port 4053
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4053

Block port 4053 in the firewall

ufw
sudo ufw deny 4053/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4053 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4053 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4053' -Direction Inbound -Protocol TCP -LocalPort 4053 -Action Block
ufw
sudo ufw deny 4053/udp
iptables
sudo iptables -A INPUT -p udp --dport 4053 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4053 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4053' -Direction Inbound -Protocol UDP -LocalPort 4053 -Action Block

Related ports

4051cppdp4052interact4054ccu-comm-24055ccu-comm-3

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