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Port 5433 (pyrrho)

IANA assigns port 5433 to pyrrho: Pyrrho DBMS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pyrrho TCP Pyrrho DBMS Malcolm Crowe -
pyrrho UDP Pyrrho DBMS Malcolm Crowe -

Registry dates for this port: registered 2005-11.

Check what is listening on port 5433

Linux: is anything listening on TCP 5433?
sudo ss -tlnp 'sport = :5433'
Linux: UDP 5433
sudo ss -ulnp 'sport = :5433'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5433
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5433 '
Windows (Command Prompt)
netstat -ano | findstr :5433
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5433 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5433
From Windows
Test-NetConnection HOST -Port 5433
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5433

Block port 5433 in the firewall

ufw
sudo ufw deny 5433/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5433 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5433 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5433' -Direction Inbound -Protocol TCP -LocalPort 5433 -Action Block
ufw
sudo ufw deny 5433/udp
iptables
sudo iptables -A INPUT -p udp --dport 5433 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5433 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5433' -Direction Inbound -Protocol UDP -LocalPort 5433 -Action Block

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