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Port 19315 (keyshadow)

IANA assigns port 19315 to keyshadow: Key Shadow for SASSAFRAS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
keyshadow TCP Key Shadow for SASSAFRAS Mark Valence -
keyshadow UDP Key Shadow for SASSAFRAS Mark Valence -

Check what is listening on port 19315

Linux: is anything listening on TCP 19315?
sudo ss -tlnp 'sport = :19315'
Linux: UDP 19315
sudo ss -ulnp 'sport = :19315'
Linux / macOS: which process owns the port
sudo lsof -nP -i :19315
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':19315 '
Windows (Command Prompt)
netstat -ano | findstr :19315
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 19315 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 19315
From Windows
Test-NetConnection HOST -Port 19315
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 19315

Block port 19315 in the firewall

ufw
sudo ufw deny 19315/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 19315 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 19315 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 19315' -Direction Inbound -Protocol TCP -LocalPort 19315 -Action Block
ufw
sudo ufw deny 19315/udp
iptables
sudo iptables -A INPUT -p udp --dport 19315 -j DROP
nftables
sudo nft add rule inet filter input udp dport 19315 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 19315' -Direction Inbound -Protocol UDP -LocalPort 19315 -Action Block

Related ports

19220cora, cora-disc19283keysrvr19398mtrgtrans19410hp-sco

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