Port 8230 (rexecj)

IANA assigns port 8230 to rexecj: RexecJ Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

rexecj TCP RexecJ Server Curtiss Howard -

rexecj UDP RexecJ Server Curtiss Howard -

Registry dates for this port: registered 2004-11.

Linux: is anything listening on TCP 8230?

sudo ss -tlnp 'sport = :8230'

Linux: UDP 8230

sudo ss -ulnp 'sport = :8230'

Linux / macOS: which process owns the port

sudo lsof -nP -i :8230

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':8230 '

Windows (Command Prompt)

netstat -ano | findstr :8230

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8230 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 8230

From Windows

Test-NetConnection HOST -Port 8230

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 8230

ufw

sudo ufw deny 8230/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 8230 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 8230 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 8230' -Direction Inbound -Protocol TCP -LocalPort 8230 -Action Block

ufw

sudo ufw deny 8230/udp

iptables

sudo iptables -A INPUT -p udp --dport 8230 -j DROP

nftables

sudo nft add rule inet filter input udp dport 8230 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 8230' -Direction Inbound -Protocol UDP -LocalPort 8230 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.