How to block Snapchat?

Hello.  I do some consulting work for a school that uses iPads.  They've asked me if I can block Snapchat's servers on the content filter so the app won't send out or receive pictures while on the school's network.  Does anyone know what server addresses to block?

Thank you!
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You could block the servers with dns via this method on the OpenDNS forums,

The servers at that time were and

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tchristmanAuthor Commented:
I found that isn't working after blocking those sites.
tchristmanAuthor Commented:
I've requested that this question be deleted for the following reason:

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