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Port 2436 (topx)

IANA assigns port 2436 to topx: TOP/X.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
topx TCP TOP/X Dragos Pop -
topx UDP TOP/X Dragos Pop -

Check what is listening on port 2436

Linux: is anything listening on TCP 2436?
sudo ss -tlnp 'sport = :2436'
Linux: UDP 2436
sudo ss -ulnp 'sport = :2436'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2436
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2436 '
Windows (Command Prompt)
netstat -ano | findstr :2436
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2436 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2436
From Windows
Test-NetConnection HOST -Port 2436
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2436

Block port 2436 in the firewall

ufw
sudo ufw deny 2436/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2436 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2436 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2436' -Direction Inbound -Protocol TCP -LocalPort 2436 -Action Block
ufw
sudo ufw deny 2436/udp
iptables
sudo iptables -A INPUT -p udp --dport 2436 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2436 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2436' -Direction Inbound -Protocol UDP -LocalPort 2436 -Action Block

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