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Port 828 (itm-mcell-s)

IANA assigns port 828 to itm-mcell-s.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
itm-mcell-s TCP itm-mcell-s Portnoy Boxman -
itm-mcell-s UDP itm-mcell-s Portnoy Boxman -

Check what is listening on port 828

Linux: is anything listening on TCP 828?
sudo ss -tlnp 'sport = :828'
Linux: UDP 828
sudo ss -ulnp 'sport = :828'
Linux / macOS: which process owns the port
sudo lsof -nP -i :828
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':828 '
Windows (Command Prompt)
netstat -ano | findstr :828
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 828 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 828
From Windows
Test-NetConnection HOST -Port 828
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 828

Block port 828 in the firewall

ufw
sudo ufw deny 828/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 828 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 828 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 828' -Direction Inbound -Protocol TCP -LocalPort 828 -Action Block
ufw
sudo ufw deny 828/udp
iptables
sudo iptables -A INPUT -p udp --dport 828 -j DROP
nftables
sudo nft add rule inet filter input udp dport 828 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 828' -Direction Inbound -Protocol UDP -LocalPort 828 -Action Block

Related ports

802mbap-s810fcp-udp829pkix-3-ca-ra830netconf-ssh

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