HTTPfy

Port 5400 (excerpt)

IANA assigns port 5400 to excerpt: Excerpt Search.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
excerpt TCP Excerpt Search John Hinsdale -
excerpt UDP Excerpt Search John Hinsdale -

Check what is listening on port 5400

Linux: is anything listening on TCP 5400?
sudo ss -tlnp 'sport = :5400'
Linux: UDP 5400
sudo ss -ulnp 'sport = :5400'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5400
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5400 '
Windows (Command Prompt)
netstat -ano | findstr :5400
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5400 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5400
From Windows
Test-NetConnection HOST -Port 5400
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5400

Block port 5400 in the firewall

ufw
sudo ufw deny 5400/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5400 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5400 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5400' -Direction Inbound -Protocol TCP -LocalPort 5400 -Action Block
ufw
sudo ufw deny 5400/udp
iptables
sudo iptables -A INPUT -p udp --dport 5400 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5400 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5400' -Direction Inbound -Protocol UDP -LocalPort 5400 -Action Block

Related ports

5398elektron-admin5399securitychase5401excerpts5402mftp

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