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Port 1588 (triquest-lm)

IANA assigns port 1588 to triquest-lm.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
triquest-lm TCP triquest-lm Nand Kumar -
triquest-lm UDP triquest-lm Nand Kumar -

Check what is listening on port 1588

Linux: is anything listening on TCP 1588?
sudo ss -tlnp 'sport = :1588'
Linux: UDP 1588
sudo ss -ulnp 'sport = :1588'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1588
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1588 '
Windows (Command Prompt)
netstat -ano | findstr :1588
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1588 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1588
From Windows
Test-NetConnection HOST -Port 1588
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1588

Block port 1588 in the firewall

ufw
sudo ufw deny 1588/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1588 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1588 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1588' -Direction Inbound -Protocol TCP -LocalPort 1588 -Action Block
ufw
sudo ufw deny 1588/udp
iptables
sudo iptables -A INPUT -p udp --dport 1588 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1588 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1588' -Direction Inbound -Protocol UDP -LocalPort 1588 -Action Block

Related ports

1586ibm-abtact1587pra-elmd, pra_elmd1589vqp1590gemini-lm

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