HTTPfy

Port 3264 (ccmail)

IANA assigns port 3264 to ccmail: cc:mail/lotus.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ccmail TCP cc:mail/lotus brockman -
ccmail UDP cc:mail/lotus brockman -

Check what is listening on port 3264

Linux: is anything listening on TCP 3264?
sudo ss -tlnp 'sport = :3264'
Linux: UDP 3264
sudo ss -ulnp 'sport = :3264'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3264
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3264 '
Windows (Command Prompt)
netstat -ano | findstr :3264
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3264 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3264
From Windows
Test-NetConnection HOST -Port 3264
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3264

Block port 3264 in the firewall

ufw
sudo ufw deny 3264/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3264 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3264 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3264' -Direction Inbound -Protocol TCP -LocalPort 3264 -Action Block
ufw
sudo ufw deny 3264/udp
iptables
sudo iptables -A INPUT -p udp --dport 3264 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3264 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3264' -Direction Inbound -Protocol UDP -LocalPort 3264 -Action Block

Related ports

3262necp3263ecolor-imager3265altav-tunnel3266ns-cfg-server

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