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Port 4448 (asc-slmd)

IANA assigns port 4448 to asc-slmd: ASC Licence Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
asc-slmd TCP ASC Licence Manager Casper Stoel -
asc-slmd UDP ASC Licence Manager Casper Stoel -

Check what is listening on port 4448

Linux: is anything listening on TCP 4448?
sudo ss -tlnp 'sport = :4448'
Linux: UDP 4448
sudo ss -ulnp 'sport = :4448'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4448
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4448 '
Windows (Command Prompt)
netstat -ano | findstr :4448
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4448 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4448
From Windows
Test-NetConnection HOST -Port 4448
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4448

Block port 4448 in the firewall

ufw
sudo ufw deny 4448/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4448 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4448 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4448' -Direction Inbound -Protocol TCP -LocalPort 4448 -Action Block
ufw
sudo ufw deny 4448/udp
iptables
sudo iptables -A INPUT -p udp --dport 4448 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4448 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4448' -Direction Inbound -Protocol UDP -LocalPort 4448 -Action Block

Related ports

4446n1-fwp4447n1-rmgmt4449privatewire4450camp

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