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Port 9281 (swtp-port1)

IANA assigns port 9281 to swtp-port1: SofaWare transport port 1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
swtp-port1 TCP SofaWare transport port 1 Amir Rapson -
swtp-port1 UDP SofaWare transport port 1 Amir Rapson -

Registry dates for this port: registered 2002-02.

Check what is listening on port 9281

Linux: is anything listening on TCP 9281?
sudo ss -tlnp 'sport = :9281'
Linux: UDP 9281
sudo ss -ulnp 'sport = :9281'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9281
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9281 '
Windows (Command Prompt)
netstat -ano | findstr :9281
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9281 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9281
From Windows
Test-NetConnection HOST -Port 9281
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9281

Block port 9281 in the firewall

ufw
sudo ufw deny 9281/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9281 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9281 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9281' -Direction Inbound -Protocol TCP -LocalPort 9281 -Action Block
ufw
sudo ufw deny 9281/udp
iptables
sudo iptables -A INPUT -p udp --dport 9281 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9281 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9281' -Direction Inbound -Protocol UDP -LocalPort 9281 -Action Block

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