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Port 361 (semantix)

IANA assigns port 361 to semantix: Semantix.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
semantix TCP Semantix Semantix -
semantix UDP Semantix Semantix -

Check what is listening on port 361

Linux: is anything listening on TCP 361?
sudo ss -tlnp 'sport = :361'
Linux: UDP 361
sudo ss -ulnp 'sport = :361'
Linux / macOS: which process owns the port
sudo lsof -nP -i :361
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':361 '
Windows (Command Prompt)
netstat -ano | findstr :361
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 361 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 361
From Windows
Test-NetConnection HOST -Port 361
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 361

Block port 361 in the firewall

ufw
sudo ufw deny 361/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 361 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 361 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 361' -Direction Inbound -Protocol TCP -LocalPort 361 -Action Block
ufw
sudo ufw deny 361/udp
iptables
sudo iptables -A INPUT -p udp --dport 361 -j DROP
nftables
sudo nft add rule inet filter input udp dport 361 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 361' -Direction Inbound -Protocol UDP -LocalPort 361 -Action Block

Related ports

358shrinkwrap360scoi2odialog362srssend363rsvp-tunnel, rsvp_tunnel

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