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// File transfer & sharing

Port 1758: tftp-mcast

Port 1758 is assigned by IANA to tftp-mcast (tftp-mcast).

1758

How tftp-mcast works

File transfer & sharing
client:17581/32/33/3tftp-mcast client:17581/32/33/3tftp-mcast

Files are sent over port 1758 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 1758 dangerous?

We have no specific security note for port 1758. 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 1758

ServicePortTransportDescriptionReferenceUpdated
tftp-mcast 1758 TCP, UDP tftp-mcast - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1758, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1758'      # process listening on 1758
sudo lsof -nP -i :1758

macOS

sudo lsof -nP -i :1758

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1758 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1758
netstat -ano | findstr :1758

From another machine

nmap -p 1758 -sV <host>
sudo nmap -sU -p 1758 <host>
nc -zv <host> 1758

Block it in the firewall

sudo ufw deny 1758/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1758" -Direction Inbound -LocalPort 1758 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1758 used for?

Port 1758 is assigned by IANA to tftp-mcast (tftp-mcast).

Is port 1758 TCP or UDP?

Port 1758 is registered for TCP and UDP.

Is it safe to open port 1758?

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 1758 is open?

On Linux run "ss -ltnup 'sport = :1758'", on macOS "lsof -nP -i :1758", and on Windows "netstat -ano | findstr :1758" to see the local process. From another machine, "nmap -p 1758 <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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