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Port 1436 (saism)

IANA assigns port 1436 to saism: Satellite-data Acquisition System 2.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
saism TCP Satellite-data Acquisition System 2 Bill Taylor -
saism UDP Satellite-data Acquisition System 2 Bill Taylor -

Check what is listening on port 1436

Linux: is anything listening on TCP 1436?
sudo ss -tlnp 'sport = :1436'
Linux: UDP 1436
sudo ss -ulnp 'sport = :1436'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1436
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1436 '
Windows (Command Prompt)
netstat -ano | findstr :1436
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1436 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1436
From Windows
Test-NetConnection HOST -Port 1436
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1436

Block port 1436 in the firewall

ufw
sudo ufw deny 1436/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1436 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1436 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1436' -Direction Inbound -Protocol TCP -LocalPort 1436 -Action Block
ufw
sudo ufw deny 1436/udp
iptables
sudo iptables -A INPUT -p udp --dport 1436 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1436 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1436' -Direction Inbound -Protocol UDP -LocalPort 1436 -Action Block

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