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Port 8128 (paycash-online)

IANA assigns port 8128 to paycash-online: PayCash Online Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
paycash-online TCP PayCash Online Protocol MegaZone -
paycash-online UDP PayCash Online Protocol MegaZone -

Registry dates for this port: registered 2005-08.

Check what is listening on port 8128

Linux: is anything listening on TCP 8128?
sudo ss -tlnp 'sport = :8128'
Linux: UDP 8128
sudo ss -ulnp 'sport = :8128'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8128
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8128 '
Windows (Command Prompt)
netstat -ano | findstr :8128
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8128 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8128
From Windows
Test-NetConnection HOST -Port 8128
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8128

Block port 8128 in the firewall

ufw
sudo ufw deny 8128/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8128 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8128 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8128' -Direction Inbound -Protocol TCP -LocalPort 8128 -Action Block
ufw
sudo ufw deny 8128/udp
iptables
sudo iptables -A INPUT -p udp --dport 8128 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8128 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8128' -Direction Inbound -Protocol UDP -LocalPort 8128 -Action Block

Related ports

8121apollo-data8122apollo-admin8129paycash-wbp8130indigo-vrmi

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