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Port 1553 (sna-cs)

IANA assigns port 1553 to sna-cs.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sna-cs TCP sna-cs Tony Sowter -
sna-cs UDP sna-cs Tony Sowter -

Check what is listening on port 1553

Linux: is anything listening on TCP 1553?
sudo ss -tlnp 'sport = :1553'
Linux: UDP 1553
sudo ss -ulnp 'sport = :1553'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1553
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1553 '
Windows (Command Prompt)
netstat -ano | findstr :1553
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1553 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1553
From Windows
Test-NetConnection HOST -Port 1553
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1553

Block port 1553 in the firewall

ufw
sudo ufw deny 1553/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1553 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1553 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1553' -Direction Inbound -Protocol TCP -LocalPort 1553 -Action Block
ufw
sudo ufw deny 1553/udp
iptables
sudo iptables -A INPUT -p udp --dport 1553 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1553 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1553' -Direction Inbound -Protocol UDP -LocalPort 1553 -Action Block

Related ports

1551hecmtl-db1552pciarray1554caci-lm1555livelan

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