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Port 1221 (sweetware-apps)

IANA assigns port 1221 to sweetware-apps: SweetWARE Apps.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sweetware-apps TCP SweetWARE Apps David Dunetz -
sweetware-apps UDP SweetWARE Apps David Dunetz -

Check what is listening on port 1221

Linux: is anything listening on TCP 1221?
sudo ss -tlnp 'sport = :1221'
Linux: UDP 1221
sudo ss -ulnp 'sport = :1221'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1221
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1221 '
Windows (Command Prompt)
netstat -ano | findstr :1221
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1221 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1221
From Windows
Test-NetConnection HOST -Port 1221
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1221

Block port 1221 in the firewall

ufw
sudo ufw deny 1221/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1221 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1221 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1221' -Direction Inbound -Protocol TCP -LocalPort 1221 -Action Block
ufw
sudo ufw deny 1221/udp
iptables
sudo iptables -A INPUT -p udp --dport 1221 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1221 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1221' -Direction Inbound -Protocol UDP -LocalPort 1221 -Action Block

Related ports

1219aeroflight-ret1220qt-serveradmin1222nerv1223tgp

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