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1. #Thompson center serial number date serial numbers#
2. #Thompson center serial number date mod#
3. #Thompson center serial number date serial#

This is no exception for Longines watches.

#Thompson center serial number date serial#

The vast majority of watches are equipped with a serial number. From winning the Grand Prix at the Universal Exhibition in Paris in 1900, to being the official timekeeper for Formula 1 for 10 years, and much more in between. Founded in 1832, Longines has achieved and done a lot over the course of its history.

#Thompson center serial number date mod#

So, if you exceed the big four billion plus number as I did in my example above, named will run one of those mod (modulo) operations on it, basically removing as many increments of 4294967296 as it can and then leaving you with the remainder.Longines is one of the oldest Swiss watch brands in the world. Still, they didn't want to cramp your style.

#Thompson center serial number date serial numbers#

So, not surprisingly, the designers of DNS figured you wouldn't need more than four billion plus different serial numbers to manage your zone files. It's also the number of different values that can be stored in 32 bits - one more than the maximum value you caexpr n store in four bytes. If this number looks familiar to you, that's likely because it's the number of IP addresses available in IPv4 - a nice big more-than-four-billion number that once was considered as many IP addresses as the world would ever need.

What happened is that DNS reduces the serial number that you use if it's larger than the magical value of 4,294,967,296. You can use nslookup like this to verify the value that your DNS server assigns: abns:/var/named # nslookup If your zone file assigns 200907270001 as your serial number, for example, your server will claim the serial number is 3338774385. Your DNS service pays careful attention to your zone serial numbers, but it may not assign them the same value that you do. Whatever method reminds you prefer is fine as long as each serial number you use is larger than the one preceding it and you don't forget to update it each time you make a change.

Some sysadmins prefer, instead, to use four digits after the date so that they can associate the hour and minutes with their changes. They might have 20090729 in the zone file if they made changes on July 29th or they might prefer using 2009072901 for the first such change and 2009072902 when they make a second change the same day. If so, they need to put the year first, followed by the month and day of the month to be sure that the serial numbers become larger each time a zone file is edited. Others find it easier to base the sequence number on the current date. Some sysadmins like to use a sequential number, incrementing it for every change they make. The format of the serial number is fairly flexible. This means that sysadmins have to remember to update the serial number every time they make a change to a zone file - otherwise, their changes won't be picked up and published. If the serial number in a zone file hasn't changed since that zone was last loaded, named figures that it can ignore the file. Serial numbers in DNS zone files provide a way for the server to verify that the contents of a particular zone file are up-to-date. In fact, the number that you put in your file and the one that DNS extracts from it might be as different as 2009072700774385.

But there's more to these pseudo timestamps than meets the eye. Serial numbers in zone files help your DNS service determine whether it should re-ingest your zone files or ignore them.