To determine whether there have been changes since the last time that you saved the file, check the publication time in the current file and compare it to the publication time in the last file that you saved.
Download If you access this file programmatically, it is your responsibility to ensure that the application downloads the file only after successfully verifying the TLS certificate presented by the server.
However, this protocol is very expensive in terms of network bandwidth, since it uses the complete tcp machinery to transmit only 32 bits of data.
Users are *strongly* encouraged to upgrade to the network time protocol (NTP), which is both more accurate and more robust. Users of the NIST "DAYTIME" protocol on tcp port 13 are also strongly encouraged to upgrade to the network time protocol, which provides greater accuracy and requires less network bandwidth.
For more information about Amazon SNS reliability, see https://aws.amazon.com/sns/faqs/#Reliability.
Therefore, you might want to check the JSON file periodically to ensure that you've got the latest ranges.Rogers said the company doesn’t “maintain a list of past IP addresses for each customer, but in some cases we can manually retrieve them for a period of time (generally not further than a year back).”Abramson , Tek Savvy’s lawyer, said via email the company keeps a log of sessions for the previous 30 days.“Where a session was initiated more than 30 days ago, the starting time-stamp of that session may be retained until the session is manually refreshed.Whether you connect to a server using the name or the IP address, it is a bad practice to “hard-code” a particular server name or address into a device so that these parameters cannot be changed by the end user if that becomes necessary at some future time.All users should ensure that their software NEVER queries a server more frequently than once every 4 seconds.The following servers support only authenticated NTP requests using the symmetric key encryption method that is defined in the NTP documentation.