NTP Monitor Report

LAST UPDATED: 2022-08-29

This report identifies NTP servers that have the potential to be used in amplification attacks by criminals that wish to perform denial of service attacks.

The NTP monitor command is a Mode 7 query for MON_GETLIST_1. To manually test if a system is vulnerable to this, you can use the command:

ntpdc -n -c monlist [ip]

For more details behind the scan methodology and a daily update of global NTP Monitor scan statistics please visit our dedicated NTP Monitor scan page.

You can learn more on the report in our NTP Monitor Report tutorial.

You can learn more on our reports in general in our Overview of Free Public Benefit Shadowserver Reports presentation, which also explains example Use Cases.

For more information on our scanning efforts, check out our Internet scanning summary page.

Filename(s): scan_ntpmonitor, scan6_ntpmonitor

 

Fields

  • timestamp
    Time that the IP was probed in UTC+0
  • ip
    The IP address of the device in question
  • protocol
    Protocol that the NTP response came on (UDP)
  • port
    Port that the NTP response came from
  • hostname
    Reverse DNS name of the device in question
  • packets
    The total number of packets received from the device in question
  • size
    The total amount of data (in bytes) received from the device in question
  • asn
    ASN of where the device in question resides
  • geo
    Country where the device in question resides
  • region
    State / Province / Administrative region where the device in question resides
  • city
    City in which the device in question resides
  • amplification
    Amplification factor (This amplification is is based solely on the payload size sent and payload size received)

Sample

"timestamp","ip","protocol","port","hostname","packets","size","asn","geo","region","city","naics","sic","sector","amplification"
"2010-02-10 00:00:00",192.168.0.1,udp,123,node01.example.com,100,,64512,ZZ,Region,City,0,0,,3666.67
"2010-02-10 00:00:01",192.168.0.2,udp,123,node02.example.com,2,,64512,ZZ,Region,City,0,0,"Communications, Service Provider, and Hosting Service",61.33
"2010-02-10 00:00:02",192.168.0.3,udp,123,node03.example.com,100,,64512,ZZ,Region,City,0,0,,3666.67

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