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Port 3115 (mctet-master)

IANA assigns port 3115 to mctet-master: MCTET Master.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mctet-master TCP MCTET Master - -
mctet-master UDP MCTET Master - -

Check what is listening on port 3115

Linux: is anything listening on TCP 3115?
sudo ss -tlnp 'sport = :3115'
Linux: UDP 3115
sudo ss -ulnp 'sport = :3115'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3115
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3115 '
Windows (Command Prompt)
netstat -ano | findstr :3115
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3115 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3115
From Windows
Test-NetConnection HOST -Port 3115
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3115

Block port 3115 in the firewall

ufw
sudo ufw deny 3115/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3115 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3115 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3115' -Direction Inbound -Protocol TCP -LocalPort 3115 -Action Block
ufw
sudo ufw deny 3115/udp
iptables
sudo iptables -A INPUT -p udp --dport 3115 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3115 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3115' -Direction Inbound -Protocol UDP -LocalPort 3115 -Action Block

Related ports

3113cs-auth-svr3114ccmad3116mctet-gateway3117mctet-jserv

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