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Port 33656 (snip-slave)

IANA assigns port 33656 to snip-slave: SNIP Slave.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
snip-slave TCP SNIP Slave Dr Chris Tucker -
snip-slave UDP SNIP Slave Dr Chris Tucker -

Registry dates for this port: registered 2005-08.

Check what is listening on port 33656

Linux: is anything listening on TCP 33656?
sudo ss -tlnp 'sport = :33656'
Linux: UDP 33656
sudo ss -ulnp 'sport = :33656'
Linux / macOS: which process owns the port
sudo lsof -nP -i :33656
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':33656 '
Windows (Command Prompt)
netstat -ano | findstr :33656
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 33656 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 33656
From Windows
Test-NetConnection HOST -Port 33656
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 33656

Block port 33656 in the firewall

ufw
sudo ufw deny 33656/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 33656 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 33656 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 33656' -Direction Inbound -Protocol TCP -LocalPort 33656 -Action Block
ufw
sudo ufw deny 33656/udp
iptables
sudo iptables -A INPUT -p udp --dport 33656 -j DROP
nftables
sudo nft add rule inet filter input udp dport 33656 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 33656' -Direction Inbound -Protocol UDP -LocalPort 33656 -Action Block

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