HTTPfy

Port 5443 (spss)

IANA assigns port 5443 to spss: Pearson HTTPS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
spss TCP Pearson HTTPS Pearson -
spss UDP Pearson HTTPS Pearson -

Registry dates for this port: registered 2008-01-17.

Check what is listening on port 5443

Linux: is anything listening on TCP 5443?
sudo ss -tlnp 'sport = :5443'
Linux: UDP 5443
sudo ss -ulnp 'sport = :5443'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5443
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5443 '
Windows (Command Prompt)
netstat -ano | findstr :5443
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5443 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5443
From Windows
Test-NetConnection HOST -Port 5443
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5443

Block port 5443 in the firewall

ufw
sudo ufw deny 5443/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5443 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5443 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5443' -Direction Inbound -Protocol TCP -LocalPort 5443 -Action Block
ufw
sudo ufw deny 5443/udp
iptables
sudo iptables -A INPUT -p udp --dport 5443 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5443 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5443' -Direction Inbound -Protocol UDP -LocalPort 5443 -Action Block

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