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// Other services

Port 1227: DNS2Go

Port 1227 is assigned by IANA to dns2go (DNS2Go).

1227

How dns2go works

Other services
client:1227dns2goresponse client:1227dns2goresponse

The client sends a request to port 1227 and the dns2go 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 1227 dangerous?

We have no specific security note for port 1227. 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 1227

ServicePortTransportDescriptionReferenceUpdated
dns2go 1227 TCP, UDP DNS2Go - 2015-07-15

// source: IANA service name and port number registry

03 Check it

Which program uses port 1227, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1227'      # process listening on 1227
sudo lsof -nP -i :1227

macOS

sudo lsof -nP -i :1227

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1227 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1227
netstat -ano | findstr :1227

From another machine

nmap -p 1227 -sV <host>
sudo nmap -sU -p 1227 <host>
nc -zv <host> 1227

Block it in the firewall

sudo ufw deny 1227/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1227" -Direction Inbound -LocalPort 1227 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1227 used for?

Port 1227 is assigned by IANA to dns2go (DNS2Go).

Is port 1227 TCP or UDP?

Port 1227 is registered for TCP and UDP.

Is it safe to open port 1227?

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 1227 is open?

On Linux run "ss -ltnup 'sport = :1227'", on macOS "lsof -nP -i :1227", and on Windows "netstat -ano | findstr :1227" to see the local process. From another machine, "nmap -p 1227 <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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