CyberHunter
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// Other services

Port 1827: ASI

Port 1827 is assigned by IANA to asi (ASI).

1827

How asi works

Other services
client:1827asiresponse client:1827asiresponse

The client sends a request to port 1827 and the asi 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 1827 dangerous?

We have no specific security note for port 1827. 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 1827

ServicePortTransportDescriptionReferenceUpdated
asi 1827 TCP, UDP ASI - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1827, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1827'      # process listening on 1827
sudo lsof -nP -i :1827

macOS

sudo lsof -nP -i :1827

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1827 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1827
netstat -ano | findstr :1827

From another machine

nmap -p 1827 -sV <host>
sudo nmap -sU -p 1827 <host>
nc -zv <host> 1827

Block it in the firewall

sudo ufw deny 1827/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1827" -Direction Inbound -LocalPort 1827 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1827 used for?

Port 1827 is assigned by IANA to asi (ASI).

Is port 1827 TCP or UDP?

Port 1827 is registered for TCP and UDP.

Is it safe to open port 1827?

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 1827 is open?

On Linux run "ss -ltnup 'sport = :1827'", on macOS "lsof -nP -i :1827", and on Windows "netstat -ano | findstr :1827" to see the local process. From another machine, "nmap -p 1827 <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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