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// Network services

Port 35100: Axiomatic discovery protocol

Port 35100 is assigned by IANA to axio-disc (Axiomatic discovery protocol).

35100

How axio-disc works

Network services
client:35100axio-discresponse client:35100axio-discresponse

The client sends a request to port 35100 and the axio-disc 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
Network services
01 Security

Is port 35100 dangerous?

We have no specific security note for port 35100. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 35100

ServicePortTransportDescriptionReferenceUpdated
axio-disc 35100 TCP, UDP Axiomatic discovery protocol - 2016-12-09

// source: IANA service name and port number registry

03 Check it

Which program uses port 35100, and is it reachable?

Linux

sudo ss -ltnup 'sport = :35100'      # process listening on 35100
sudo lsof -nP -i :35100

macOS

sudo lsof -nP -i :35100

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 35100 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 35100
netstat -ano | findstr :35100

From another machine

nmap -p 35100 -sV <host>
sudo nmap -sU -p 35100 <host>
nc -zv <host> 35100

Block it in the firewall

sudo ufw deny 35100/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 35100" -Direction Inbound -LocalPort 35100 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 35100 used for?

Port 35100 is assigned by IANA to axio-disc (Axiomatic discovery protocol).

Is port 35100 TCP or UDP?

Port 35100 is registered for TCP and UDP.

Is it safe to open port 35100?

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. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 35100 is open?

On Linux run "ss -ltnup 'sport = :35100'", on macOS "lsof -nP -i :35100", and on Windows "netstat -ano | findstr :35100" to see the local process. From another machine, "nmap -p 35100 <host>" shows whether it is reachable.

05 Related
:53 DNS tcp · udp · moderate risk :135 MS RPC tcp · udp · high risk :123 NTP udp · tcp · moderate risk :67 DHCP server udp · tcp · moderate risk :111 rpcbind tcp · udp · high risk :9100 Raw printing (JetDirect) tcp · udp · high risk :631 IPP / CUPS tcp · udp · high risk :5353 mDNS udp · tcp · moderate risk

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