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// File transfer & sharing

Port 9800: WebDav Source Port

Port 9800 is assigned by IANA to davsrc (WebDav Source Port).

9800

How davsrc works

File transfer & sharing
client:98001/32/33/3davsrc client:98001/32/33/3davsrc

Files are sent over port 9800 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 9800 dangerous?

We have no specific security note for port 9800. 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 9800

ServicePortTransportDescriptionReferenceUpdated
davsrc 9800 TCP, UDP WebDav Source Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 9800, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9800'      # process listening on 9800
sudo lsof -nP -i :9800

macOS

sudo lsof -nP -i :9800

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9800 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9800
netstat -ano | findstr :9800

From another machine

nmap -p 9800 -sV <host>
sudo nmap -sU -p 9800 <host>
nc -zv <host> 9800

Block it in the firewall

sudo ufw deny 9800/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9800" -Direction Inbound -LocalPort 9800 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9800 used for?

Port 9800 is assigned by IANA to davsrc (WebDav Source Port).

Is port 9800 TCP or UDP?

Port 9800 is registered for TCP and UDP.

Is it safe to open port 9800?

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 9800 is open?

On Linux run "ss -ltnup 'sport = :9800'", on macOS "lsof -nP -i :9800", and on Windows "netstat -ano | findstr :9800" to see the local process. From another machine, "nmap -p 9800 <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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