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Port 707 (borland-dsj)

IANA assigns port 707 to borland-dsj: Borland DSJ.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
borland-dsj TCP Borland DSJ Gerg Cole -
borland-dsj UDP Borland DSJ Gerg Cole -

Check what is listening on port 707

Linux: is anything listening on TCP 707?
sudo ss -tlnp 'sport = :707'
Linux: UDP 707
sudo ss -ulnp 'sport = :707'
Linux / macOS: which process owns the port
sudo lsof -nP -i :707
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':707 '
Windows (Command Prompt)
netstat -ano | findstr :707
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 707 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 707
From Windows
Test-NetConnection HOST -Port 707
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 707

Block port 707 in the firewall

ufw
sudo ufw deny 707/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 707 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 707 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 707' -Direction Inbound -Protocol TCP -LocalPort 707 -Action Block
ufw
sudo ufw deny 707/udp
iptables
sudo iptables -A INPUT -p udp --dport 707 -j DROP
nftables
sudo nft add rule inet filter input udp dport 707 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 707' -Direction Inbound -Protocol UDP -LocalPort 707 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.