I own http://minecraftnamechecker.com/ and I can confirm that mojang will temporarly ban your IP if it thinks you are spamming their system with name attempts. I think the limit is around 50, so after 50 attempts at a name it will return that everything is taken, even if it's not.
I ran into this issue at my website, in which we use to get about 5000 name checks per day, but now we get our IP banned easily. I checked 100 names, it worked fine for the first few then everything was taken. I changed my server IP and it worked again.
So wait a few days and try again.
I do not recommend you login to mojang using a proxy so you have a different IP because your mojang information may be sent to someone else's computer (ignore this if you don't know what a proxy is)
The Meaning of Life, the Universe, and Everything.
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West. ST Paul
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7/7/2014
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braydel
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i have just bought a extra copy of minecraft yesterday so just find a username and btw typing "sagtrfugbsdfhgbrdv" is too long for a username use like privoner or something like that witch i used that username
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Skype ID : braydel.ritter
Phone Number : Check tryrip.weebly.com for the phone number
since name change will be implemented soon. i'll just pick one now and change later when they fix it.
I ran into this issue at my website, in which we use to get about 5000 name checks per day, but now we get our IP banned easily. I checked 100 names, it worked fine for the first few then everything was taken. I changed my server IP and it worked again.
So wait a few days and try again.
I do not recommend you login to mojang using a proxy so you have a different IP because your mojang information may be sent to someone else's computer (ignore this if you don't know what a proxy is)
Skype ID : braydel.ritter
Phone Number : Check tryrip.weebly.com for the phone number