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Port 18463 (ac-cluster)

IANA assigns port 18463 to ac-cluster: AC Cluster.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ac-cluster TCP AC Cluster Lisa Zhong -
ac-cluster UDP AC Cluster Lisa Zhong -

Check what is listening on port 18463

Linux: is anything listening on TCP 18463?
sudo ss -tlnp 'sport = :18463'
Linux: UDP 18463
sudo ss -ulnp 'sport = :18463'
Linux / macOS: which process owns the port
sudo lsof -nP -i :18463
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':18463 '
Windows (Command Prompt)
netstat -ano | findstr :18463
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 18463 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 18463
From Windows
Test-NetConnection HOST -Port 18463
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 18463

Block port 18463 in the firewall

ufw
sudo ufw deny 18463/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 18463 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 18463 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 18463' -Direction Inbound -Protocol TCP -LocalPort 18463 -Action Block
ufw
sudo ufw deny 18463/udp
iptables
sudo iptables -A INPUT -p udp --dport 18463 -j DROP
nftables
sudo nft add rule inet filter input udp dport 18463 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 18463' -Direction Inbound -Protocol UDP -LocalPort 18463 -Action Block

Related ports

18243clusterxl18262gv-pf18516heythings18634rds-ib

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