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// Other services

Port 7100: X Font Service

Port 7100 is assigned by IANA to font-service (X Font Service).

7100

How font-service works

Other services
client:7100font-serviceresponse client:7100font-serviceresponse

The client sends a request to port 7100 and the font-service service answers.

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
Other services
01 Security

Is port 7100 dangerous?

We have no specific security note for port 7100. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 7100

ServicePortTransportDescriptionReferenceUpdated
font-service 7100 TCP, UDP X Font Service - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 7100, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7100'      # process listening on 7100
sudo lsof -nP -i :7100

macOS

sudo lsof -nP -i :7100

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7100 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7100
netstat -ano | findstr :7100

From another machine

nmap -p 7100 -sV <host>
sudo nmap -sU -p 7100 <host>
nc -zv <host> 7100

Block it in the firewall

sudo ufw deny 7100/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7100" -Direction Inbound -LocalPort 7100 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7100 used for?

Port 7100 is assigned by IANA to font-service (X Font Service).

Is port 7100 TCP or UDP?

Port 7100 is registered for TCP and UDP.

Is it safe to open port 7100?

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. Close the port if nothing on the host needs it.

How do I check if port 7100 is open?

On Linux run "ss -ltnup 'sport = :7100'", on macOS "lsof -nP -i :7100", and on Windows "netstat -ano | findstr :7100" to see the local process. From another machine, "nmap -p 7100 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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