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// File transfer & sharing

Port 115: Simple File Transfer Protocol

Port 115 is assigned by IANA to sftp (Simple File Transfer Protocol).

115

How sftp works

File transfer & sharing
client:1151/32/33/3sftp client:1151/32/33/3sftp

Files are sent over port 115 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
Well-known (0-1023)
Category
File transfer & sharing
01 Security

Is port 115 dangerous?

We have no specific security note for port 115. 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 115

ServicePortTransportDescriptionReferenceUpdated
sftp 115 TCP, UDP Simple File Transfer Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 115, and is it reachable?

Linux

sudo ss -ltnup 'sport = :115'      # process listening on 115
sudo lsof -nP -i :115

macOS

sudo lsof -nP -i :115

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 115 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 115
netstat -ano | findstr :115

From another machine

nmap -p 115 -sV <host>
sudo nmap -sU -p 115 <host>
nc -zv <host> 115

Block it in the firewall

sudo ufw deny 115/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 115" -Direction Inbound -LocalPort 115 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 115 used for?

Port 115 is assigned by IANA to sftp (Simple File Transfer Protocol).

Is port 115 TCP or UDP?

Port 115 is registered for TCP and UDP.

Is it safe to open port 115?

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 115 is open?

On Linux run "ss -ltnup 'sport = :115'", on macOS "lsof -nP -i :115", and on Windows "netstat -ano | findstr :115" to see the local process. From another machine, "nmap -p 115 <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 :152 Background File Transfer Program tcp · udp

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