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// File transfer & sharing

Port 1818: Enhanced Trivial File Transfer Protocol

Port 1818 is assigned by IANA to etftp (Enhanced Trivial File Transfer Protocol).

1818

How etftp works

File transfer & sharing
client:18181/32/33/3etftp client:18181/32/33/3etftp

Files are sent over port 1818 in pieces and reassembled on the other side.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
File transfer & sharing
01 Security

Is port 1818 dangerous?

We have no specific security note for port 1818. Its risk depends on the program actually listening on it. General advice for file transfer & sharing services:

  • Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).
  • Disable anonymous access and restrict shares or exports to known hosts.
  • Never publish file sharing protocols to the Internet.
02 Registry

IANA registry entries for port 1818

ServicePortTransportDescriptionReferenceUpdated
etftp 1818 TCP, UDP Enhanced Trivial File Transfer Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1818, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1818'      # process listening on 1818
sudo lsof -nP -i :1818

macOS

sudo lsof -nP -i :1818

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1818 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1818
netstat -ano | findstr :1818

From another machine

nmap -p 1818 -sV <host>
sudo nmap -sU -p 1818 <host>
nc -zv <host> 1818

Block it in the firewall

sudo ufw deny 1818/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1818" -Direction Inbound -LocalPort 1818 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1818 used for?

Port 1818 is assigned by IANA to etftp (Enhanced Trivial File Transfer Protocol).

Is port 1818 TCP or UDP?

Port 1818 is registered for TCP and UDP.

Is it safe to open port 1818?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).

How do I check if port 1818 is open?

On Linux run "ss -ltnup 'sport = :1818'", on macOS "lsof -nP -i :1818", and on Windows "netstat -ano | findstr :1818" to see the local process. From another machine, "nmap -p 1818 <host>" shows whether it is reachable.

05 Related
:445 SMB tcp · udp · critical risk :21 FTP tcp · udp · sctp · high risk :139 NetBIOS Session tcp · udp · high risk :69 TFTP udp · tcp · high risk :2049 NFS tcp · udp · sctp · high risk :873 rsync tcp · udp · high risk :20 File Transfer [Default Data] tcp · udp · sctp :115 Simple File Transfer Protocol tcp · udp

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