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Port 1083 (ansoft-lm-1)

IANA assigns port 1083 to ansoft-lm-1: Anasoft License Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ansoft-lm-1 TCP Anasoft License Manager - -
ansoft-lm-1 UDP Anasoft License Manager - -

Check what is listening on port 1083

Linux: is anything listening on TCP 1083?
sudo ss -tlnp 'sport = :1083'
Linux: UDP 1083
sudo ss -ulnp 'sport = :1083'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1083
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1083 '
Windows (Command Prompt)
netstat -ano | findstr :1083
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1083 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1083
From Windows
Test-NetConnection HOST -Port 1083
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1083

Block port 1083 in the firewall

ufw
sudo ufw deny 1083/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1083 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1083 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1083' -Direction Inbound -Protocol TCP -LocalPort 1083 -Action Block
ufw
sudo ufw deny 1083/udp
iptables
sudo iptables -A INPUT -p udp --dport 1083 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1083 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1083' -Direction Inbound -Protocol UDP -LocalPort 1083 -Action Block

Related ports

1081pvuniwien1082amt-esd-prot1084ansoft-lm-21085webobjects

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