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Port 5598 (mctfeed)

IANA assigns port 5598 to mctfeed: MCT Market Data Feed.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mctfeed TCP MCT Market Data Feed Stephane Touizer -
mctfeed UDP MCT Market Data Feed Stephane Touizer -

Registry dates for this port: registered 2006-05.

Check what is listening on port 5598

Linux: is anything listening on TCP 5598?
sudo ss -tlnp 'sport = :5598'
Linux: UDP 5598
sudo ss -ulnp 'sport = :5598'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5598
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5598 '
Windows (Command Prompt)
netstat -ano | findstr :5598
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5598 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5598
From Windows
Test-NetConnection HOST -Port 5598
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5598

Block port 5598 in the firewall

ufw
sudo ufw deny 5598/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5598 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5598 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5598' -Direction Inbound -Protocol TCP -LocalPort 5598 -Action Block
ufw
sudo ufw deny 5598/udp
iptables
sudo iptables -A INPUT -p udp --dport 5598 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5598 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5598' -Direction Inbound -Protocol UDP -LocalPort 5598 -Action Block

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