Who are they?

[ebird]

http://www.icann.org/registrars/accredited-list.html

Check the list. RegisterFly, RegisterClub, Joker.com are not there. GoDaddy is there.

What's the difference amons all these rigistrars?

ebird

[meow]

I know one difference is RegisterClub sucks.

[Chicken]

Joker is there somewhere, and I even think they list 'joker' as the domain. Other registrars have their compnay name there, sometimes a parent company, which isn't as easy to connect to the domain reg. site, but theydo list the URLs as well (so you should be able to tell).

Registerclub, Registerfly, etc., are resellers of one of those on the list (though I thought Registerclub was owned by errrr... Alabanza, errrr... something.... anyway, some accredited registrar).

[Woofcat]

Joker is run by CSL GmbH... They're there...

[patrickw]

Chicken is right (like always).

Many registrars will resell or be a partner of a larger company that is actually accredited by ICANN. For instance, OpenSRS (Tucows) is accredited, and then all of us RSPs sell the domains to the end user.

Also, like they said, the company name and the domain name may be two different things. My company name is "Southern Solutions, LLC." but my hosting and domain registration companies do business under different names.