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Port 124 (ansatrader)

IANA assigns port 124 to ansatrader: ANSA REX Trader.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
ansatrader TCP ANSA REX Trader Nicola J Howarth -
ansatrader UDP ANSA REX Trader Nicola J Howarth -

Check what is listening on port 124

Linux: is anything listening on TCP 124?
sudo ss -tlnp 'sport = :124'
Linux: UDP 124
sudo ss -ulnp 'sport = :124'
Linux / macOS: which process owns the port
sudo lsof -nP -i :124
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':124 '
Windows (Command Prompt)
netstat -ano | findstr :124
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 124 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 124
From Windows
Test-NetConnection HOST -Port 124
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 124

Block port 124 in the firewall

ufw
sudo ufw deny 124/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 124 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 124 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 124' -Direction Inbound -Protocol TCP -LocalPort 124 -Action Block
ufw
sudo ufw deny 124/udp
iptables
sudo iptables -A INPUT -p udp --dport 124 -j DROP
nftables
sudo nft add rule inet filter input udp dport 124 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 124' -Direction Inbound -Protocol UDP -LocalPort 124 -Action Block

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