HTTPfy

Port 592 (eudora-set)

IANA assigns port 592 to eudora-set: Eudora Set.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
eudora-set TCP Eudora Set Randall Gellens -
eudora-set UDP Eudora Set Randall Gellens -

Check what is listening on port 592

Linux: is anything listening on TCP 592?
sudo ss -tlnp 'sport = :592'
Linux: UDP 592
sudo ss -ulnp 'sport = :592'
Linux / macOS: which process owns the port
sudo lsof -nP -i :592
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':592 '
Windows (Command Prompt)
netstat -ano | findstr :592
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 592 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 592
From Windows
Test-NetConnection HOST -Port 592
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 592

Block port 592 in the firewall

ufw
sudo ufw deny 592/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 592 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 592 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 592' -Direction Inbound -Protocol TCP -LocalPort 592 -Action Block
ufw
sudo ufw deny 592/udp
iptables
sudo iptables -A INPUT -p udp --dport 592 -j DROP
nftables
sudo nft add rule inet filter input udp dport 592 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 592' -Direction Inbound -Protocol UDP -LocalPort 592 -Action Block

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