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Port 3620 (ep-pcp)

IANA assigns port 3620 to ep-pcp: EPSON Projector Control Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ep-pcp TCP EPSON Projector Control Port - -
ep-pcp UDP EPSON Projector Control Port - -

Check what is listening on port 3620

Linux: is anything listening on TCP 3620?
sudo ss -tlnp 'sport = :3620'
Linux: UDP 3620
sudo ss -ulnp 'sport = :3620'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3620
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3620 '
Windows (Command Prompt)
netstat -ano | findstr :3620
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3620 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3620
From Windows
Test-NetConnection HOST -Port 3620
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3620

Block port 3620 in the firewall

ufw
sudo ufw deny 3620/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3620 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3620 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3620' -Direction Inbound -Protocol TCP -LocalPort 3620 -Action Block
ufw
sudo ufw deny 3620/udp
iptables
sudo iptables -A INPUT -p udp --dport 3620 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3620 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3620' -Direction Inbound -Protocol UDP -LocalPort 3620 -Action Block

Related ports

3618aairnet-13619aairnet-23621ep-nsp3622ff-lr-port

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