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Port 463 (alpes)

IANA assigns port 463 to alpes.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
alpes TCP alpes Alain Durand -
alpes UDP alpes Alain Durand -

Check what is listening on port 463

Linux: is anything listening on TCP 463?
sudo ss -tlnp 'sport = :463'
Linux: UDP 463
sudo ss -ulnp 'sport = :463'
Linux / macOS: which process owns the port
sudo lsof -nP -i :463
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':463 '
Windows (Command Prompt)
netstat -ano | findstr :463
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 463 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 463
From Windows
Test-NetConnection HOST -Port 463
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 463

Block port 463 in the firewall

ufw
sudo ufw deny 463/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 463 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 463 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 463' -Direction Inbound -Protocol TCP -LocalPort 463 -Action Block
ufw
sudo ufw deny 463/udp
iptables
sudo iptables -A INPUT -p udp --dport 463 -j DROP
nftables
sudo nft add rule inet filter input udp dport 463 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 463' -Direction Inbound -Protocol UDP -LocalPort 463 -Action Block

Related ports

461datasurfsrv462datasurfsrvsec464Kerberos password change465SMTPS (submission over TLS)

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