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Port 4183 (cyborgnet)

IANA assigns port 4183 to cyborgnet: CyborgNet communications protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cyborgnet TCP CyborgNet communications protocol Gareth Nelson -
cyborgnet UDP CyborgNet communications protocol Gareth Nelson -

Registry dates for this port: registered 2015-11-13.

Check what is listening on port 4183

Linux: is anything listening on TCP 4183?
sudo ss -tlnp 'sport = :4183'
Linux: UDP 4183
sudo ss -ulnp 'sport = :4183'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4183
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4183 '
Windows (Command Prompt)
netstat -ano | findstr :4183
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4183 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4183
From Windows
Test-NetConnection HOST -Port 4183
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4183

Block port 4183 in the firewall

ufw
sudo ufw deny 4183/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4183 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4183 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4183' -Direction Inbound -Protocol TCP -LocalPort 4183 -Action Block
ufw
sudo ufw deny 4183/udp
iptables
sudo iptables -A INPUT -p udp --dport 4183 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4183 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4183' -Direction Inbound -Protocol UDP -LocalPort 4183 -Action Block

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