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Port 6142 (aspentec-lm)

IANA assigns port 6142 to aspentec-lm: Aspen Technology License Manager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
aspentec-lm TCP Aspen Technology License Manager Kevin Massey -
aspentec-lm UDP Aspen Technology License Manager Kevin Massey -

Check what is listening on port 6142

Linux: is anything listening on TCP 6142?
sudo ss -tlnp 'sport = :6142'
Linux: UDP 6142
sudo ss -ulnp 'sport = :6142'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6142
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6142 '
Windows (Command Prompt)
netstat -ano | findstr :6142
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6142 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6142
From Windows
Test-NetConnection HOST -Port 6142
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6142

Block port 6142 in the firewall

ufw
sudo ufw deny 6142/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6142 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6142 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6142' -Direction Inbound -Protocol TCP -LocalPort 6142 -Action Block
ufw
sudo ufw deny 6142/udp
iptables
sudo iptables -A INPUT -p udp --dport 6142 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6142 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6142' -Direction Inbound -Protocol UDP -LocalPort 6142 -Action Block

Related ports

6140pulsonixnls6141meta-corp6143watershed-lm6144statsci1-lm

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