HTTPfy

Port 2453 (madge-ltd)

IANA assigns port 2453 to madge-ltd: madge ltd.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
madge-ltd TCP madge ltd Mark Lyall -
madge-ltd UDP madge ltd Mark Lyall -

Check what is listening on port 2453

Linux: is anything listening on TCP 2453?
sudo ss -tlnp 'sport = :2453'
Linux: UDP 2453
sudo ss -ulnp 'sport = :2453'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2453
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2453 '
Windows (Command Prompt)
netstat -ano | findstr :2453
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2453 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2453
From Windows
Test-NetConnection HOST -Port 2453
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2453

Block port 2453 in the firewall

ufw
sudo ufw deny 2453/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2453 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2453 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2453' -Direction Inbound -Protocol TCP -LocalPort 2453 -Action Block
ufw
sudo ufw deny 2453/udp
iptables
sudo iptables -A INPUT -p udp --dport 2453 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2453 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2453' -Direction Inbound -Protocol UDP -LocalPort 2453 -Action Block

Related ports

2451netchat2452snifferclient2454indx-dds2455wago-io-system

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