HTTPfy

Port 1836 (ste-smsc)

IANA assigns port 1836 to ste-smsc.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ste-smsc TCP ste-smsc Tom Snauwaert -
ste-smsc UDP ste-smsc Tom Snauwaert -

Check what is listening on port 1836

Linux: is anything listening on TCP 1836?
sudo ss -tlnp 'sport = :1836'
Linux: UDP 1836
sudo ss -ulnp 'sport = :1836'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1836
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1836 '
Windows (Command Prompt)
netstat -ano | findstr :1836
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1836 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1836
From Windows
Test-NetConnection HOST -Port 1836
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1836

Block port 1836 in the firewall

ufw
sudo ufw deny 1836/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1836 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1836 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1836' -Direction Inbound -Protocol TCP -LocalPort 1836 -Action Block
ufw
sudo ufw deny 1836/udp
iptables
sudo iptables -A INPUT -p udp --dport 1836 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1836 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1836' -Direction Inbound -Protocol UDP -LocalPort 1836 -Action Block

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