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Port 2828 (itm-lm)

IANA assigns port 2828 to itm-lm: ITM License Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
itm-lm TCP ITM License Manager Portnoy Boxman -
itm-lm UDP ITM License Manager Portnoy Boxman -

Check what is listening on port 2828

Linux: is anything listening on TCP 2828?
sudo ss -tlnp 'sport = :2828'
Linux: UDP 2828
sudo ss -ulnp 'sport = :2828'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2828
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2828 '
Windows (Command Prompt)
netstat -ano | findstr :2828
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2828 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2828
From Windows
Test-NetConnection HOST -Port 2828
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2828

Block port 2828 in the firewall

ufw
sudo ufw deny 2828/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2828 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2828 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2828' -Direction Inbound -Protocol TCP -LocalPort 2828 -Action Block
ufw
sudo ufw deny 2828/udp
iptables
sudo iptables -A INPUT -p udp --dport 2828 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2828 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2828' -Direction Inbound -Protocol UDP -LocalPort 2828 -Action Block

Related ports

2826slc-systemlog2827slc-ctrlrloops2829silkp12830silkp2

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