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Port 1887 (filex-lport)

IANA assigns port 1887 to filex-lport: FileX Listening Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
filex-lport TCP FileX Listening Port Megan Woods -
filex-lport UDP FileX Listening Port Megan Woods -

Check what is listening on port 1887

Linux: is anything listening on TCP 1887?
sudo ss -tlnp 'sport = :1887'
Linux: UDP 1887
sudo ss -ulnp 'sport = :1887'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1887
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1887 '
Windows (Command Prompt)
netstat -ano | findstr :1887
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1887 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1887
From Windows
Test-NetConnection HOST -Port 1887
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1887

Block port 1887 in the firewall

ufw
sudo ufw deny 1887/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1887 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1887 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1887' -Direction Inbound -Protocol TCP -LocalPort 1887 -Action Block
ufw
sudo ufw deny 1887/udp
iptables
sudo iptables -A INPUT -p udp --dport 1887 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1887 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1887' -Direction Inbound -Protocol UDP -LocalPort 1887 -Action Block

Related ports

1885vrtstrapserver1886leoip1888ncconfig1889unify-adapter

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