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Port 5020 (zenginkyo-1)

IANA assigns port 5020 to zenginkyo-1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
zenginkyo-1 TCP zenginkyo-1 Masashi Suzaki -
zenginkyo-1 UDP zenginkyo-1 Masashi Suzaki -

Check what is listening on port 5020

Linux: is anything listening on TCP 5020?
sudo ss -tlnp 'sport = :5020'
Linux: UDP 5020
sudo ss -ulnp 'sport = :5020'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5020
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5020 '
Windows (Command Prompt)
netstat -ano | findstr :5020
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5020 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5020
From Windows
Test-NetConnection HOST -Port 5020
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5020

Block port 5020 in the firewall

ufw
sudo ufw deny 5020/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5020 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5020 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5020' -Direction Inbound -Protocol TCP -LocalPort 5020 -Action Block
ufw
sudo ufw deny 5020/udp
iptables
sudo iptables -A INPUT -p udp --dport 5020 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5020 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5020' -Direction Inbound -Protocol UDP -LocalPort 5020 -Action Block

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