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Port 1087 (cplscrambler-in)

IANA assigns port 1087 to cplscrambler-in: CPL Scrambler Internal.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cplscrambler-in TCP CPL Scrambler Internal - -
cplscrambler-in UDP CPL Scrambler Internal - -

Check what is listening on port 1087

Linux: is anything listening on TCP 1087?
sudo ss -tlnp 'sport = :1087'
Linux: UDP 1087
sudo ss -ulnp 'sport = :1087'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1087
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1087 '
Windows (Command Prompt)
netstat -ano | findstr :1087
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1087 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1087
From Windows
Test-NetConnection HOST -Port 1087
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1087

Block port 1087 in the firewall

ufw
sudo ufw deny 1087/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1087 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1087 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1087' -Direction Inbound -Protocol TCP -LocalPort 1087 -Action Block
ufw
sudo ufw deny 1087/udp
iptables
sudo iptables -A INPUT -p udp --dport 1087 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1087 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1087' -Direction Inbound -Protocol UDP -LocalPort 1087 -Action Block

Related ports

1085webobjects1086cplscrambler-lg1088cplscrambler-al1089ff-annunc

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