Why do some domains use www2 and www3 in the prefix?

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Why some domains use www2 and www3 in the prefix?

For example:

  • www2.exemplo.com

  • www3.exemplo.com

I noticed that some websites like the government use, but I don’t know the exact reason.

domain subdomain
  • 4

    Yeah, from the government, right? :)

  • 1

    Related: Why the address of some sites contains number after www?

  • Usually are gambiarras, with mirroring, applied when there is overload in dns servers or hosting. There are also maintenance cases where you need to keep your main server offline. There are more appropriate means for this, but it requires a structure whose cost becomes unfeasible for small and medium businesses or in tight budgets in the case of government agencies, etc. I have used this in certain situations, a client who has grown dizzyingly and without structures. " Who has no dog, hunts with cat.". However, it is not always used for "gambiarras". It depends on each case.

  • 1

    Big question. It’s that thing you see, you don’t understand very well, but let it go...

  • 1

    Participate in the campaign don’t be an asshole and justify your negative vote, so that I can improve the question. Your opinion is important to the community.

1 answer

12


The hostnames www2, www3 e www4 are mirrors of the original server, the main objective of this technique is to reduce the server load, perform a load balancing or to maintain the online service when the original server needs to be updated.

How @Guilhermenascimento quoted hostname numbers are sequential.

What is a hostname: It is the name that is given to the computer, it serves so that we can identify a machine in the network, more easily than an IP number, in the same way that two bodies cannot coexist in the same space, two machines cannot have equal names in the same network.

What is a subdomain: are the branches of the main domain, something widely used in large websites. On the [support.youdomain.com.br], for example, [*.youdomain.com.br] is the domain, and "support" is the subdomain, which has the function of driving the user directly to the specific section of the site.

Sources:

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